Kyla McConnell
Alice Blumenthal-Dramé- English Department, University of Freiburg, Freiburg, Germany
While it is widely acknowledged that both predictive expectations and retrodictive integration influence language processing, the individual differences that affect these two processes and the best metrics for observing them have yet to be fully described. The present study aims to contribute to the debate by investigating the extent to which experienced-based variables modulate the processing of word pairs (bigrams). Specifically, we investigate how age and reading experience correlate with lexical anticipation and integration, and how this effect can be captured by the metrics of forward and backward transition probability (TP). Participants read more and less strongly associated bigrams, paired to control for known lexical covariates such as bigram frequency and meaning (i.e., absolute control, total control, absolute silence, total silence) in a self-paced reading (SPR) task. They additionally completed assessments of exposure to print text (Author Recognition Test, Shipley vocabulary assessment, Words that Go Together task) and provided their age. Results show that both older age and lesser reading experience individually correlate with stronger TP effects. Moreover, TP effects differ across the spillover region (the two words following the noun in the bigram).
Introduction
Comprehending language is one of the most complicated tasks that humans perform on a regular basis, yet we do it with astounding proficiency and ease. One mechanism that may support this effortless comprehension is probabilistic processing, a framework that has gained traction in recent empirical research in linguistics (Ambridge et al., 2015; Bod et al., 2015; Blumenthal-Dramé, 2016b; Behrens and Pfänder, 2016; Kuperberg and Jaeger, 2016; Armeni et al., 2017; Divjak, 2019). Probabilistic models of language acquisition and processing are situated within the broader paradigm of probabilistic cognition, which assumes that humans learn about and construct a mental representation of the world based on distributional information from the environment and apply this statistical knowledge in interacting with and predicting future states of the world. These abilities for statistical learning and processing are claimed to be key ingredients to cognition in domains as different as motor control, visual perception, causal learning, inferential reasoning and language (Chater and Oaksford, 2008; Perfors et al., 2011; Tenenbaum et al., 2011; Griffiths et al., 2012; Lupyan and Clark, 2015; Ordin et al., 2020).
A myriad of studies confirm that comprehenders are sensitive to word-level distributional patterns such as word frequency (see, for example, Gries and Divjak, 2012). Experimental evidence shows that these statistical constraints can be utilized in the service of prediction on diverse levels of language comprehension, including the first sound of an upcoming word (DeLong et al., 2005; but see ; Nieuwland et al., 2018; Yan et al., 2017), the grammatical gender of an upcoming word (Wicha et al., 2003), the semantic features of expected lexical items (Federmeier and Kutas, 1999), and specific words that fit sentence-level context (Otten and Van Berkum, 2008). Strong views of prediction in language processing, such as the view marshalled by the “predictive coding” framework, posit that the brain’s central function is to predict across all types of sensory input, from completing a friend’s sentence to driving down a familiar road. According to this view, the mind predicts constantly and sensory input is largely ignored unless it disconfirms these predictions (Clark, 2013; Hohwy, 2013; Lupyan and Clark, 2015).
However, just because predictive processing is plausible doesn’t mean that it is a strategy that the processor must always implement (Huettig and Mani, 2015; Pickering and Gambi, 2018). There is growing consensus for the view that “perhaps prediction occurs less or not at all in challenging situations and in less proficient language users” (Huettig, 2015, 131). Prediction also seems to be susceptible to task demands; it is reduced when processing must occur rapidly and results can be significantly altered by experimental design factors (Wlotko and Federmeier, 2015; Huettig and Guerra, 2019). The fact that not all comprehenders predict in all situations implies that “predictive processing may not be the best—or even a viable—strategy for all individuals at all phases of the lifespan and/or in all processing situations” (Federmeier, 2007, 495). Indeed, it may be simply one of many strategies that the processor can select from depending on task demands and capacity (Huettig and Mani, 2015; Huettig and Janse, 2016).
Further, comprehenders’ knowledge of the distributional patterns of language are not necessarily utilized in a strictly forward-looking direction. Rather, probabilistic knowledge of language patterns may facilitate integration of incoming input to unfolding meanings and structures; that is, more constrained input may simply be easier to link to existing context once encountered, facilitating comprehension (Ferreira and Chantavarin, 2018). These two routes, prediction and integration, must not be fully independent or exclusive, and may indeed be “two sides of the same coin” (Ferreira and Chantavarin, 2018, 447). In the following paper, we explore the extent to which experience-based individual differences affect lexical anticipation and integration as captured by two metrics that have taken center stage in probabilistic linguistics: forward and backward transition probability.
Experience-Based Individual Differences
Adult native speakers were long thought to achieve a certain ideal attainment, in which they had a complete and uniform understanding of their native language. However, usage-based approaches posit that human skills are highly plastic and shaped by experience (Evans and Levinson, 2009; Dąbrowska, 2015; Dąbrowska, 2018). Recent research has highlighted that language attainment within adult native speakers is modulated by both endogenous constraints (e.g., executive functions, statistical learning abilities, personality traits) and exogenous, experience-related variables (notably, the quality and quantity of the input) (Andringa and Dąbrowska, 2019; Dąbrowska, 2019; Frost et al., 2019; Medimorec et al., 2019; Divjak and Milin, 2020; Kidd and Donnelly, 2020; Ryskin et al., 2020; Kerz and Wiechmann, 2021).
As far as the exogenous variables are concerned, different lines of experimental research converge to suggest that subjects’ language processing strategies are fine-tuned to their linguistic experience. Members of the same speech community process language differently based on their personal experience, which includes, among other things: language exposure (Brysbaert et al., 2018; Dąbrowska, 2019), world knowledge (Ryskin et al., 2019; Venhuizen et al., 2019; Troyer and Kutas, 2020), vocabulary size (Yap et al., 2012; Milin et al., 2017; Kidd et al., 2018), print exposure (Falkauskas and Kuperman, 2015), domain expertise (Verhagen et al., 2018) and social network size (Lev-Ari, 2019). Further, language processing changes across the lifespan as experience accumulates (and the brain changes) (Brysbaert et al., 2016; Hanulíková et al., 2020). Frequency effects also reflect the impact of experience on language processing; even structurally identical multi-morphemic sequences are processed differently depending on their usage frequency, with higher-frequency sequences (like government or I don’t know) eliciting greater processing ease and chunked access relative to rarer ones (like amazement or You don’t swim) (Blumenthal-Dramé, 2016a; Blumenthal-Dramé et al., 2017; Carrol and Conklin, 2019).
Reading Experience
Written texts have different distributional patterns compared to spoken language; they generally have a higher proportion of low frequency words and a wider variety of complex syntactic structures (Biber, 1995; Roland et al., 2007; Dąbrowska, 2018). Not only does initially acquiring reading skills reshape the brain and improve language skills, but literate adult readers also vary considerably in their reading frequency and ability (Huettig and Mishra, 2014; Dehaene et al., 2015). Reading experience has been found to affect language processing, especially in the domain of lexical-level effects, where more proficient readers show reduced sensitivity to word frequencies, potentially indicating that they allocate less effort to word-level decoding and lexical access (Kuperman and Van Dyke, 2011; Yap et al., 2012; Adelman et al., 2014; Falkauskas and Kuperman, 2015; but see Kuperman and Van Dyke, 2013).
Although more proficient readers show reduced word frequency effects, more reading experience seems to pattern with heightened prediction effects (Kukona et al., 2016; Favier et al., 2021). Populations with smaller vocabularies, such as non-native speakers and low literates, rely less on predictions (Mishra et al., 2012; Huettig and Mani, 2015; Pickering and Gambi, 2018). Children’s predictive ability in comprehension covaries with their language production ability, which may be linked to their experience with language overall (Mani and Huettig, 2012). Domain-specific text experience can also encourage prediction; job-seekers have lower voice onset times in predictively completing job-related multi-word sequences (“good communication…”) (Verhagen et al., 2018). Neurolinguistic studies also support the idea that increased reading experience leads to greater sensitivity to predictability, though the effect seems to be sensitive to task demands, especially time pressure (Ng et al., 2017; Tabullo et al., 2020).
The conclusion that increased reading experience leads to larger predictability effects is not undisputed, however. Slattery and Yates find that better readers show a lessened effect of context-based predictability on gaze durations, while Whitford and Titone report that reading experience modulates frequency effects but not predictability effects (Whitford and Titone, 2014; Slattery and Yates, 2018). One reason for these inconsistencies might be that it is not always clear which level of prediction the study is actually measuring, e.g., the level of letters, morphemes, lexemes or meanings (Huettig, 2015). Another reason might be that research on predictive processing and reading experience has operationalized predictability in different ways. Quantifying predictability via cloze scores or other context-based measures is likely to tap into general world knowledge, while relying on statistics extracted from corpora is more likely to capture language-specific distributional knowledge. However, it may also be that more experienced readers have better bottom-up word recognition skills and thus a reduced need for probabilistic processing, as summarized by Hersch and Andrews (2012):
“although skilled readers are more effective at using context and previous knowledge to facilitate the higher order integration and inferential processes required for comprehension (…) they can retrieve lexical and semantic information for most words using bottom-up information before contextually based predictions become available (Perfetti, 1992)” (Hersch and Andrews, 2012, 241).
The question thus becomes whether probabilistic processing, whether prediction or integration, is a compensatory mechanism or a luxury (or perhaps it can serve both purposes, depending on the person and the situation). Furthermore, do the conclusions based on cloze-based predictability, which likely draws at least partially on world knowledge, extend to probabilistic processing on the level of lexical co-occurrence? In the current study, we investigate the effect of reading experience on the prediction and integration of lexical co-occurrence, while also considering the experience-based factor of age, to address these questions and determine how language experience interacts with processing.
Age
Age has widely been assumed to have a modulatory effect on predictive processing; however, the direction of this effect is still under debate (Gordon et al., 2016; Dave et al., 2018; Payne and Silcox, 2019). On the one hand, older adults generally have greater crystallized intelligence (i.e., knowledge accumulated throughout the lifespan), which is comprised of non-linguistic world knowledge, vocabulary (Brysbaert et al., 2016; Sánchez-Izquierdo and Fernández-Ballesteros, 2021), schematic or generalized representations of common occurrences (Ghosh and Gilboa, 2014), and more entrenched distributional knowledge (such as which units of language typically co-occur in language use) (Ramscar et al., 2014; Whitford and Titone, 2019). It has been hypothesized that older adults may rely on their superior crystallized knowledge to engage more readily in linguistic prediction, possibly as a strategy to compensate for perceptual (auditory, visual) decline or for age-related slowing (for review, see Gordon et al., 2016; Payne and Silcox, 2019).
In line with this view, several eye-movement studies have found evidence in support of the assumption that older readers rely on top-down knowledge more strongly, though potentially in a qualitatively different manner than younger readers. Word frequency effects are larger in older than younger adults and older readers show differential, and sometimes stronger, sensitivity to predictability in spoken and written word processing (Kliegl et al., 2004; Laubrock et al., 2006; Rayner et al., 2006; Rayner et al., 2011; Rayner et al., 2013; Huettig and Janse, 2016; Moers et al., 2017; Choi et al., 2017; Steen-Baker et al., 2017; Whitford and Titone, 2017; Whitford and Titone, 2019).
On the other hand, electrophysiological event-related potentials research suggests reduced and delayed predictability effects of sentential context (as assessed in terms of cloze probability for the sentence-final word) in older adults (Federmeier et al., 2010; DeLong et al., 2012; Wlotko et al., 2012; Wlotko and Federmeier, 2012), sometimes in combination with preserved or increased lexical-level effects (word frequency and orthographic neighborhood density; Payne and Federmeier, 2018).
The inconsistency between behavioral and electrophysiological results about age effects and probabilistic processing might be attributable to differences in experimental design. For example, eye tracking studies typically allow for relatively naturalistic reading strategies, whereas EEG studies tend to adopt a rapid serial visual presentation format, where subjects do not move their eyes and cannot read at a natural pace, since subsequent words of a sentence overwrite each other as they are presented at the same location of the screen. Moreover, studies have adopted different ways of assessing predictability (e.g., cloze predictability vs distributional statistics derived from corpora) and have not consistently differentiated between different sources of top-down knowledge (e.g., world knowledge plausibility, co-occurrence statistics in corpora, lexical frequency; see Whitford and Titone, 2017). Finally, many studies have focused on prediction effects for the last words of sentences, which might be confounded by wrap-up processes known to change across the lifespan (Stine-Morrow and Payne, 2016).
In summary, we expected healthy older people to show heightened effects of lexical-level association patterns than their younger counterparts, independent of their reading experience. This effect could be driven by two different sources: probabilistic processing may be relied on more heavily in cases where the processor has sensory processing deficits or additional experience may simply lead to more efficient language processing in general.
Transition Probabilities in Language Learning and Processing
Broadly speaking, forward transition probability (FTP) can be defined as the probability of occurrence of a unit given the preceding context, whereas backward transition probability (BTP) is the probability of occurrence of a unit given the following context1. FTP and BTP have been shown to have a number of correlates in language acquisition, representation and processing at different linguistic levels: from phones and syllables (Aslin, 2017; Hartshorne et al., 2019), to morphemes, lexemes and parts of speech (Solomyak and Marantz, 2010; Lewis et al., 2011; Henderson et al., 2016; Aslin, 2017; Blumenthal-Dramé et al., 2017; Çöltekin, 2017; Hartshorne et al., 2019), and even syntactic structures and semantic representations (Linzen and Jaeger, 2016; Venhuizen et al., 2019).
Most prominently, FTP and BTP have been related to the formation and use of multi-unit “chunks” at varying levels of representation (Pelucchi et al., 2009; McCauley and Christiansen, 2019; Roete et al., 2020). Chunking works in two directions: from wholes to parts (segmentation), and from parts to wholes (grouping) (Christiansen and Arnon, 2017). On the one hand, language users (and, notably, children acquiring their first language) learn to segment the continuous sensory stream of language into sub-units at different grain sizes (e.g., words, morphemes, syllables, phones). On the other hand, they learn to treat frequently co-occurring low-level items as configurations that can be manipulated holistically at a higher level of representation (thus, a succession of morphemes like govern- and -ment can be handled as a unit at the lexical level or a succession of syntactic categories like (Det) (N) can be treated as a phrasal unit). Importantly, research suggests that language users capitalize on the fact that TPs are low between segments and high within segments to extract and construct the building blocks of their language (Blumenthal-Dramé et al., 2017; Isbilen et al., 2020).
Moreover, empirical research has demonstrated that bigrams with lower TPs are more effortful to process, as measured in terms of processing speed, accuracy and brain activation (McDonald and Shillcock, 2003a; McDonald and Shillcock, 2003b; Boston et al., 2008; Demberg and Keller, 2008; Levy, 2008; Frank and Bod, 2011; Frank, 2013; Smith and Levy, 2013; Frank et al., 2015; Hale, 2016; Willems et al., 2016; Lopopolo et al., 2017; Nelson et al., 2017; Lowder et al., 2018). High TPs have also been shown to support language comprehension under challenging speech or reading circumstances, arguably because they allow for the top-down activation of missing or degraded lower-level components (Lorenz and Tizón-Couto, 2019). Likewise, it has been demonstrated that partial input primes high- but not low-TP completions (e.g., govern primes government more than it primes governor, because of higher TPs between govern- and -ment than between govern- and -or) (Blumenthal-Dramé, 2017; Blumenthal-Dramé et al., 2017). These different strands of empirical research, along with the inherent forward-looking directionality of FTP, have been taken to suggest that FTP taps into predictive online processing (for discussion, see Aurnhammer and Frank, 2019). BTP, by contrast, does not tap into prediction processes, which by definition must occur before the sensory signal has been encountered. Rather, BTP is likely to correlate with the ease of retrodiction or integration processes, which connect a physically present sensory signal to the previous input to generate a unified and coherent mental representation (Ferreira and Chantavarin, 2018; van Paridon and Alday, 2020; Onnis et al.).
The dual mechanisms of prediction and integration must not be separable or mutually exclusive and neither must forward and backward transition probability; adult native speakers are likely to be sensitive to both (Perruchet and Desaulty, 2008) and they may be descriptive in parallel (McCauley and Christiansen, 2019). With this in mind, we operationalize these two core linguistic processes through the metrics of BTP and FTP, in order to assess how they are modulated by experience. Ultimately, we aim to answer whether greater experience leads to greater reliance on statistical regularities, making them a “luxury” for the best-equipped processors (such as those who have accumulated the most experience through age or reading exposure), or rather they are a backup or compensatory mechanism for those who have deficits in other linguistic areas (either due to age-related cognitive decline or lower exposure to reading).
Materials and Methods
Stimuli
Bigram Extraction
To maximize objectivity in stimuli selection while simultaneously achieving naturalistic stimuli, modifier-noun bigrams were extracted computationally from the Corpus of Contemporary American English (COCA), which contains a total of about one billion words from 1990 to 2019. Stimuli selection included three main steps: First, an initial list of 1,133 modifier-noun bigrams2 was extracted from the corpus over a smooth range of log-transformed bigram frequency (MacCallum et al., 2002; Baayen, 2010). Bigram frequency was calculated on the lemma level and ranged from 1 to 6,060 (approx. 6 per million words), with a median value of 38.
Bigrams were rejected if they were emotionally arousing (violent, sexual, or religious) or specialist terms from restricted domains like sports or medicine, so pairs like “primal screams” and “canonical coefficients” were not eligible. Additionally, only bigrams containing one lexical (base) morpheme and up to two derivational and inflectional morphemes were permitted, because words made up of more than one lexical morpheme could themselves be seen as collocations at the morphological level (“widespread,” “lifestyles”). Similarly, words beginning with removable prefixes were not included (“inexperienced,” “unusual”). Both words in the bigram also had to have consistent spelling in both British and American English and be less than 12 letters long.
In addition to these criteria, idioms and compounds were also removed. Idioms were identified when at least one word was used “in a figurative, technical, or de-lexical sense only found in the context of a limited number of collocates” (Howarth, 1996; Howarth, 1998; presented in Gyllstad and Wolter, 2016, 299). Thus, bigrams like “eager beaver” and “tidy profits” were ineligible. Bigrams were removed for being compounds if they were not separable, did not allow modification of the first element and/or had non-compositional meaning, e.g., “botanic gardens” and “instant messaging” (Bauer, 2004, 11).
Bigram Pairing
Of course, word associations and other lexical-level factors are not the only force affecting lexical processing; n-gram (or chunk) frequency is also a major factor (Lorenz and Tizón-Couto, 2019; Supasiraprapa, 2019). Usage-based approaches posit that the comprehender does not access, concatenate, or integrate the component words of high-frequency n-grams but rather retrieves chunks of varying sizes holistically (Blumenthal-Dramé, 2017; Ambridge, 2020; Havron and Arnon, 2021). Further, higher n-gram frequency correlates with greater speed and accuracy in comprehension, production, and acquisition regardless of other lexical-level factors, and this effect is consistently found in self-paced reading paradigms (McConnell and Blumenthal-Dramé, 2019).
However, controlling for bigram frequency in a statistical model that focuses on transition probabilities is difficult; not only are the metrics often highly correlated, but they are also intrinsically linked because bigram frequency is an essential component in calculating transition probabilities3. Thus, we matched each of the 501 remaining bigrams with another bigram with the same first word and a maximally similar log-transformed bigram frequency (within a window of ± 0.25). By keeping bigram frequency constant, the effect of the second word in terms of its association to the first word could be isolated. The repetition of the first word (W1) also establishes a natural control item. That is, if W1 provides a processing advantage regardless of both frequency and association strength, this advantage should be seen in both bigrams. By comparing these bigrams, we can isolate the processing advantage of the word-level associations captured by forward and backward transition probability. The matched items were checked along the same criteria presented above and a random sample of 75 pairs was extracted from the eligible items.
Although creating two bigrams with the same W1 allows us to “zoom in” on the level of association between individual words, it would still be impossible to rule out that differences to RTs on the second word (W2) were not based on specific characteristics of that word. That is, hypothetically, if “bad luck” is read faster than “bad idea,” this could reflect that “luck” is easier to process than “idea” for any reason, regardless of the word that precedes it. To avoid this problem and to counteract any possible effects of meaningfulness (Jolsvai et al., 2020), we establish a baseline by adding another pair of bigrams which contain the same W2s as the original bigrams, but paired with synonymous adjectives. This allows for the comparison of bigrams on the basis of association strength between the two words, without influence of chunk frequency or any word-level characteristics of either individual word.
For each bigram, FTP was calculated as the raw frequency of the bigram divided by the (raw) frequency of the first word (range: 0.1894–0.00001; mean: 0.0101). BTP was quantified as bigram frequency divided by the frequency of the second word (range: 0.0955–0.00001; mean: 0.0035). TPs were log-transformed then centered and scaled using the scale() function in R. In our sample, forward and backward transition probability were correlated with each other (Spearman’s ρ = 0.52) and with bigram frequency (ρ = 0.65 and ρ = 0.78, respectively; see Figures 1, 2).
FIGURE 1. Correlation between stimuli characteristics (Spearman’s ρ): log-transformed bigram frequency (bfreq_lz), log-transformed current word frequency (freq_lz), log-transformed previous word frequency (prev_freq_lz), log-transformed backward transition probability (BTP_lz), log-transformed forward transition probability (FTP_lz), current word length in number of characters (length_z) and previous word length in number of characters (prev_length_z).
FIGURE 2. Bigrams by log-transformed forward transition probability and log-transformed backward transition probability (approximate raw values in parentheses).
Sentences
Critical bigrams were embedded in sentence onsets that were designed to be equally plausible with any of the four matched bigrams, so that onsets could be counterbalanced across participants. Critical words were followed by three-word spillover regions that were held as consistent as possible over the two pairs to maximize comparability. These spillover regions were followed by at least one further word to catch sentence-end wrap-up effects. See Table 1 for example stimuli. Each participant saw one list (A or B), thus participants did not read highly similar sentences. Similar sentences (i.e., both labeled A1) were spaced maximally within a set, and shuffled in order across participants.
TABLE 1. Example stimuli (from lists A and B).
Sentence onsets were created to be maximally semantically neutral to avoid priming or prediction before the reader encountered the first word in the bigram (the modifier). To prevent uncontrolled semantic relations or priming, role nouns such as what? were excluded from sentence heads—instead, proper names, group nouns, or occasionally, inanimate subjects were used. Names were not repeated and the repetition of other lexical items was also restricted except when it came to highly frequent items (e.g., “little”). Sentences were further designed to have the critical bigram in different semantic and syntactic roles, to reduce predictability of stimuli. This means that in some items, the bigram took the role of the subject, in others it was the direct or indirect object, and in others still, it functioned as part of a fronted subordinate clause. Sentences varied in length from 8 to 21 words (median: 13) and did not contain words with regional spellings.
After collecting data but before analyzing results, 23 items from the synonym condition were removed because they were unattested in COCA (for example, “cozy parka,” “checkered paper”) and six items were removed because they (unintentionally) had the same first word as another item.
Self-Paced Reading
Not including the removed items, participants read 259 sentences. Approximately 33% of sentences were followed by a multiple-choice comprehension question, which usually had three options expect for small proportion in a yes/no format (16%). Questions were designed to probe all levels of processing, from the surface recall of proper names and lexical items or phrases (Who was inspired by the dress? “Katrina,” “Catherine,” “Louisa”) to overall comprehension of the sentence (Why was the building evacuated? “a part collapsed,” “someone saw smoke,” “renovations were being made”) and higher-level inferences (Did the conversations lead to a solution? “yes,” “no”).
Participants were instructed to read as normally as possible and were informed that the sentences were not related to each other. They were told to answer questions with the best answer, and to keep short breaks (such as drinking water) to the question screens, not the reading sections. The reading section was estimated to take about 45 min.
Participants
Participants were recruited online via Prolific (Damer and Bradley, 2018). Submissions for which less than 80% of SPR comprehension questions were answered correctly were not considered in the analysis. Recruitment stopped when 100 participants with useable submissions were reached; however, only 97 participants were used in the current study because two did not complete the vocabulary task and one received a score of only 28%. 56 participants were female. Education was measured on a 4-point scale: 19 participants had at least some high school education, 21 had attended technical or trade school, 43 had a bachelor’s degree and 14 had an advanced degree (Master’s or Ph.D.). All participants were required to be monolingual native speakers of English; 60 participants were British nationals and 37 were United States nationals4.
Participant age ranged from 18 to 76 (mean: 34.6, median: 31, SD: 11.7), see Figure 3. By recruiting participants within this range, we look specifically at age effects during general adulthood without considering old age or youth. This allows for maximally comparable participants that are not in the prime years of acquisition but also not so advanced in age as to be incomparable in terms of sensory and cognitive ability as well as technological savvy. We expected age effects to appear in these mid-range adult years based on prior research showing that cognitive abilities vary across the entire adult lifespan, not only at the extremes (Hartshorne and Germine, 2015).
FIGURE 3. Age of participants (self-reported).
Individual Difference Assessments
Before starting with any tasks, participants provided their age, nationality and level of education. They completed the self-paced reading section as one block and a total of 10 individual difference assessments in another block; both blocks were completed in the same sitting with the option for a break in between and the order of the blocks as well as the tasks within the individual difference block were counter-balanced over subjects. Three reading-based individual differences are presented below; the other tasks were used separately for a different experiment.
Vocabulary Task
To assess vocabulary, participants completed a timed version of the Shipley Institute of Living scale, in which they had to select the best synonym for a given word (abbrv. “vocab” below) (Shipley, 1940)5. For example, participants were asked to select a word that meant the same as “fortify” from the set: “strengthen,” “submerge,” “vent”, “deaden”. Participants were told not to use any other browser tabs and were presented the questions in a randomized order with 8 s to select the best option. Participant scores were calculated as the number of sets for which the correct synonym was selected; they ranged from 20 to 38 correct answers out of 40 questions (median: 31), see Figure 4.
FIGURE 4. Distribution of scores on the vocabulary task.
Author Recognition Task
Similarly, participants completed an author recognition task (abbrv. ART), a commonly used assessment of reading amount that circumvents inflated scores that tend to arise from a direct question. By asking participants to identify authors, but not directly asking how much they read, those who see reading as a favorable pastime, but who do not read often themselves, are less able to inflate their own scores. However, it should be kept in mind that participants from social groups that are well-read or educated may also know more authors names without having read any of the texts from those authors. In the current experiment, the ART task contained 65 authors names from Acheson et al., 2008, an update on Stanovich and West, 1989. Though Acheson and colleagues tested the list on a United States undergraduate audience, the median score across all participants in the United Kingdom was 7.5 points higher in our sample (57.5 vs. 50.0). Because many of the real author names were recognized by less than 10% of the undergraduates tested, just 40 additional foils were taken from Mar et al. (2006), which had a similarly structured task and openly published these names. Participants scores were calculated as the total number of correct answers minus a point for each incorrect guess and ranged from 22 to 90 (median: 56), see Figure 5.
FIGURE 5. Distribution of scores on the Author Recognition task.
Words That Go Together Task
Finally, participants were also presented the Words that Go Together task introduced in Dąbrowska, 2015 (abbrv. WGT). The task had 40 multiple-choice questions, each of which contained five collocated bigrams, where the participant was asked to select the pair that “sounds the most natural or familiar.” Participants were further instructed to guess if they didn’t know which pair sounded best. Sets varied in frequency; one example is: “hazard a guess,” “chance a guess,” “dare a guess,” “gamble a guess,” “risk a guess”. Participant’s scores were the number of pairs for which they chose the most highly collocated pair and ranged from 4 to 36 correct answers (median: 29), see Figure 6. Across median scores by country, participants from the United Kingdom scored five points higher than United States participants in our sample (30 vs. 25). However, since the participants from the United Kingdom scored higher on the US-based ART, this does not seem concerning in terms of a bias of the current task towards United Kingdom Englishes.
FIGURE 6. Distribution of scores on the Words that Go Together task.
All reading-based tasks were positively correlated with age, with the Author Recognition task the most strongly correlated with increasing age. More importantly, the scores on all reading assessments were all strongly correlated with each other (see Figure 7). This is an expected effect, as it may reflect a common or at least similar mechanism behind all measures of reading experience. Because both theoretical assumptions and the quantitative correlation suggest that the measures capture the same variance, we used all constructs together as one metric of reading exposure, by adding all centered and scaled individual scores (vocab + ART + WGT) and then again centering and scaling the result across all participants. This doesn’t allow us to draw conclusions about specific score types that may be driving the effect, but further levels of specificity are not necessary to our hypothesis.
FIGURE 7. Correlation (Spearman’s ρ) of scores on the vocabulary task (vocab_z), the Words that Go Together task (wgt_z), the author recognition task (art_z), the overall reading experience metric (reading_exp_z), and age (age_z).
Modeling
Data was first prepared in R: in this stage, reading times were joined to frequency data extracted from COCA and word and bigram frequencies were log-transformed. RTs below 100 m or (subsequently) outside of 2.5 standard deviations of each participant’s individual mean were removed6 (total: 2.2%). RTs were log-transformed and then centered and scaled. All other numeric variables were also centered and scaled. The prepared data was then loaded into Julia and analyzed with linear mixed effects models using MixedModels.jl (Bates et al., 2021) and plotted in R with the ggeffects package via JellyMe4.jl.
The critical word was defined as the noun in the bigram, because at this point, participants were able to recognize the completed bigram. Our previous research showed that an association effect develops over the spillover region (the critical word and the two following words), so two words following the noun were also included and the variable “position” was effects coded with three levels (McConnell and Blumenthal-Dramé, 2019).
Random slopes were calculated on three grouping variables: participant, the first word in the bigram (W1) and the second word in the bigram (W2). Grouping on W1 pairs bigrams paired items based on the automatic frequency-matched bigram extraction. Grouping on W2 pairs bigrams allowed for bigrams to vary based on semantic similarity (see Table 1). To control for commonly observed self-paced reading effects, trial number, word length7 and (effects-coded) position in sentence were included as covariates. We additionally control for level of education, which was Helmert coded as a factor with four levels.
Because forward and backward transition probability were strongly correlated (ρ = 0.53) and our predictions for them were disparate, they were not included in the same model. In a first step, two maximal models were fit with the same fixed effects structure, one with forward transition probability and one with backward transition probability. The random effects structure of the maximal models were assessed via PCA and were initially overfit, as expected. Without looking at fixed effects coefficients or p-values, the random effects structure was first reduced; terms that described a small portion of the variance in both models were removed to reduce overfitting until rePCA results were satisfactory (i.e., all random effects terms added to the variance described) (Matuschek et al., 2017; Bates et al., 2018). After fitting, model diagnostic plots were visually inspected and no major issues were detected. Analysis files are available in a Github repository: https://github.com/kyla-mcconnell/inddiff_experience
Results
For each model, we fit a four-way interaction between age, reading experience, position, and FTP/BTP, as we hypothesized that the effect of experience may change over the critical region as a factor of these two types of experience. However, no three- or four-way interactions were statistically significant.
In both the model with forward transition probability (Table 2) and the model with backward transition probability (Table 3), slower responses followed longer current or previous words (length_z, prev_length_z) and proceeding towards the end of the experiment (trial_number_z) or the end of the sentence (word_number_z) led to faster response times, as expected. In terms of experience, older participants (age_z) had slower response times in general, but there was no main effect of reading experience (reading_exp_z) in either model. In both models, higher transition probabilities, whether forward (FTP) or backward (BTP), led to quicker reading times in general; however, only the main effect of BTP was statistically significant (β = -0.0052 (SE: 0.0018), p = 0.00408).
TABLE 2. Model output, linear mixed effects model with forward transition probability.
TABLE 3. Model output linear mixed effects model with backward transition probability.
Response times to the noun in the critical bigram (position: noun) also tended to be faster than to the word immediately following it (position: spillover_1). The effect of transition probability also varied by position: Higher FTP correlated with faster response times in the spillover region but slower response times on the noun (β = 0.0059 (SE: 0.0014), p = < 0.001, Figure 8). Higher BTP also correlated with faster response times particularly on the first spillover word (β = −0.0031 (SE: 0.0014), p = 0.0251, Figure 11).
FIGURE 8. Interaction between (log-transformed, z-scored) forward transition probability and position in the sentence (noun in associated modifier-noun bigram, first and second spillover words).
In terms of experience-based predictors, both FTP and BTP had significant interactions with age (β = −0.0026 (SE: 0.0012), p = 0.0240 and β = −0.0022 (SE: 0.0011), p = 0.0452, respectively). Both also interact with reading experience, though this is only statistically significant for BTP (β = 0.0024 (SE: 0.0011), p = 0.0336; FTP: β = 0.0017 (SE: 0.0012), p = 0.1494). Interestingly, age and reading experience show opposite effects: age enhances the speeding up effects associated with transition probability, while greater reading experience reduces the effects. See the marginal effects plots in Figures 9–13 for a visualization of these interactions.
FIGURE 9. Interaction between (log-transformed, z-scored) forward transition probability and age at sample ages (min: 18, median: 31, max: 76, and midway between median and max: 54).
FIGURE 10. Interaction between (log-transformed, z-scored) forward transition probability and reading experience (at the minimum, first quartile, median, third quartile, and maximum values).
FIGURE 11. Interaction between (log-transformed, z-scored) backward transition probability and position in the sentence (noun in associated modifier-noun bigram, first and second spillover words).
FIGURE 12. Interaction between (log-transformed, z-scored) backward transition probability and age at sample ages (min: 18, median: 31, max: 76, and midway between median and max: 54).
FIGURE 13. Interaction between (log-transformed, z-scored) backward transition probability and reading experience (at the minimum, first quartile, median, third quartile, and maximum values).
Discussion
In this self-paced reading experiment, we investigated probabilistic prediction and integration as parallel mechanisms in language processing, operationalized in terms of forward (FTP) and backward (BTP) transition probability. In stimuli controlled for bigram frequency, there was a significant main effect of BTP but no significant main effect of FTP, confirming our previous research, in which BTP was also a more suitable predictor of reading times to bigrams (McConnell and Blumenthal-Dramé, 2019). BTP and FTP also unfolded differently over the critical and spillover region in this dataset, highlighting that they capture at least partially unique reading mechanisms.
In the case of age, higher age correlated with an increased processing (speed) benefit for bigrams with higher transition probabilities. This is in line with previous research, which has found that older adults rely more heavily on predictive processing and have more entrenched probabilistic knowledge. Older participants also consistently read more slowly than younger participants in this study, which may have allowed them more time for lexical access to individual words and the distributional statistics associated with them (an effect that could even be heightened in a self-paced reading set-up).
We initially considered two explanations for why older readers may process more probabilistically: because they have greater experience with language and world knowledge in general, or because they are compensating for perceptual decline and cognitive slowing. In isolation, the results for age do not answer this question; however, the effect of reading experience provides insight into the question of whether an increased reliance on distributional knowledge is a luxury, in which case the most experienced readers should be better able to exploit distributional information to facilitate processing, or if it is rather a compensatory mechanism, in which case participants with less experience should show greater effects of transition probability.
Although in our sample, greater age and increased reading experience were positively correlated (ρ = 0.39, see Figure 7), they show effects in different directions. Thus, the two individual difference factors can be disentangled and even have competing effects on language comprehension processes. Interestingly, participants with less reading experience show increased speeding up effects of BTP and FTP, which seems to contradict the previous research that has found that more reading experience makes a comprehender more predictive (see Section 1.1.1). However, the majority of these studies operationalized prediction via cloze scores, which may rely more heavily on general world knowledge, ability to effectively use context, or other mechanisms (McDonald and Shillcock, 2003a; McDonald and Shillcock, 2003b; Boston et al., 2008, but see Frisson et al., 2005).
Taken together, we find that those participants who may have the most need for compensation, either because of greater age or due to reduced experience with reading, exhibit a stronger speeding-up effect in the processing of modifier-noun bigrams with higher BTP, and, to a lesser extent, FTP. This could be tied to the finding that older age and less reading experience correlated with slower reading in general: On the one hand, slower reading could be a side effect of accessing distributional patterns such as FTP and BTP from long-term memory. On the other hand, perhaps this slowing is indicative of a need to devote more effort to word-level decoding and lexical access in general, and this effort intensifies the difference in processing bigrams with low vs. high transition probabilities. It could also simply be the case that our younger and more experienced groups were already at ceiling for transition probability effects in our stimuli.
Although we did not find a three-way interaction with transition probability, we did find that average readers are qualitatively different to highly skilled readers particularly in terms of the time course of effects, as previous research has also confirmed (Ashby et al., 2005). Bigrams with higher BTP had a general speeding up effect across the entire spillover region, but especially on the first spillover word. However, higher FTP elicited slower reading times on the noun and faster reading times on the first spillover word, and slowing on the noun was particularly pronounced for both older and less experienced readers. Perhaps, then, slower reading allows more time for access to distributional information at the noun, as mentioned above. On the other hand, accessing distributional information at the noun may cost time for those who are older or weaker readers to begin with, but assist later in the spillover region. If this is the case, then probabilistic processing as a compensatory mechanism seems to be efficient in supporting processing.
There are of course limitations to the current design. The self-paced reading paradigm, for example, may have affected some groups differentially; more experienced readers, younger readers, and potentially faster readers in general may have been disrupted by the somewhat unnatural constraints of self-paced reading, which don’t allow for phenomena like word skipping, which is especially common in highly predictable phrases. By presenting lexical units separately, and disallowing parafoveal preview, the experimental paradigm may have disrupted normal reading, especially in highly associated bigrams that may naturally be read as multi-word units.
Additionally, the current research cannot speak to how TPs at different grain sizes interact (see Section 1.2). For example, if discussion is more predictable after helpful than after careful but the morpheme -ful is less predictable after help- than it is after care-9, does the comparatively low morphological predictability within helpful undermine the comparatively high lexical predictability within helpful discussion? Or does the presumed chunk status of helpful discussion give cognitive precedence to the whole over the constituents parts (Blumenthal-Dramé, 2017)? Or do different levels of TP analysis have equal weight and balance each other off? And does the extent to which subjects rely on probabilistic cues at different levels depend on their world and reading experience? For example, word length effects suggest that beginning readers read words in a more letter-by-letter fashion than advanced readers, who adopt a more holistic reading style (Barton et al., 2014). Other research shows that in reading development, phonological awareness emerges before morphological awareness. This indicates that younger readers may track TPs on the letter level (and at the level of letter-sound correspondences), whereas more advanced readers might adopt a wider TP sampling window (e.g., inter-morphemic or inter-lexical TPs), which may or may not supersede lower-level knowledge (Mann and Singson, 2003).
Follow-up research is encouraged to consider TPs at more fine-grained levels of analysis (letters, phonemes, syllables, etc.), TPs between longer stretches of language [e.g. the predictability of the unit (helpful discussion), given the preceding context], and TPs at abstract levels of analysis [e.g., between the syntactic categories (Adj) and (N)] (Celata, 2020). Ultimately, it would also be desirable take into account TPs that cut across levels [e.g. between the morpheme -ful and the lexeme discussion, or between the lexeme helpful and the syntactic category (N)] and even TPs between context and language strings (e.g., how predictable is helpful discussion in an academic context?). Of course, this should be conducted from the perspective of individual differences, among the groups posited here as well as those not focused on in this study.
Conclusion
In conclusion, we found that older and less experienced readers show heightened effects of transition probability. Against this background, we suggested that increased reliance on probabilistic processing should be seen a compensatory mechanism rather than a luxury. We also found initial evidence for a different time course of effects based on both individual differences in experience and the reliance on either prediction (FTP) or integration (BTP), but more large-scale research is necessary to support this initial claim. Taken together, our research reveal that experience-based individual differences can critically affect the reliance on distributional statistics in language processing.
Data Availability Statement
The raw data supporting the conclusion of this article will be made available by the authors, without undue reservation.
Ethics Statement
The study was approved by the ethics committee of Freiburg University. The participants provided their written informed consent to participate in this study.
Author Contributions
Following the CRediT system (https://casrai.org/credit/). KMC: Conceptualization, Methodology, Software, Formal analysis, Investigation, Data Curation, Writing – Original Draft, Writing – Review and Editing, Visualization, Funding acquisition. AB-D: Conceptualization, Methodology, Writing – Review and Editing, Supervision. Both authors contributed to the article and approved the submitted version.
Funding
Participant recruitment was funded by the Wissenschaftliche Gesellschaft in Freiburg im Breisgau. The article processing charge was funded by the Baden-Württemberg Ministry of Science, Research and Art and the University of Freiburg via the funding program Open Access Publishing. This research was supported by a grant from the German National Academic Foundation (Studienstiftung des deutschen Volkes) to KM.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s Note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
Acknowledgments
The authors thank Jiří Zámečník for his contributions to the programming of the online experiment, as well as the two reviewers and the editor for their constructive feedback on earlier drafts of the manuscript.
Footnotes
1In the following, findings related to the closely related information-theoretic metric of surprisal (which can be defined as negative log FTP), will be subsumed under FTP.
2Initially, 5,000 items were extracted, but the majority of these were lemma duplicates, so the list had to be automatically reduced to only one item per lemma (i.e., to remove a plural noun if the singular noun was present).
3FTP = W1 frequency/bigram frequency; BTP = W2 frequency/bigram frequency
4The reference corpus is composed of American English; however, the stimuli were designed to not be regionally specific. To ensure that the choice of corpus did not affect results in a way that preferred participants who were United States nationals, we ran a post-hoc model which included an additional fixed effects term for nationality (dummy-coded with United States as the reference level), as well as an interaction term for FTP/BTP by nationality. Neither term was statistically significant. See supplementary materials for the full model output: https://github.com/kyla-mcconnell/inddiff_experience
5http://www.musicianbrain.com/documentation/Shipley_Vocab.pdf
6Using participant means and SDs instead of an absolute upper bound was designed to not disadvantage slower readers, many of whom are older or have less reading experience.
7Word length and previous length were used (instead of the commonly used covariate of word frequency), because current and previous word frequencies are essential components to calculating forward and backward transition probability. Since the model covers a 3-word span from word 2 (the critical word, where the bigram can be identified) to two words after the critical word, using word frequency would create the situation that for some words in some models, information about current and/or previous word frequencies is already included in the BTP/FTP predictor, but for other words it isn’t. To ensure that this was the correct design decision, we ran a post-hoc LMM comparing a model using word lengths to one using word frequencies and found that the model using length was better fit and that coefficients and statistical significance was essentially unchanged. See supplementary materials for full model: https://github.com/kyla-mcconnell/inddiff_experience
8A β-value of −0.0052 means that for an increase of one standard deviation in the predictor (BTP), the outcome variable (log-transformed RT) decreases by 0.0052 standard deviations. For response times in this sample, one standard deviation corresponds to approximately 149.5 m. Thus, the effect of a change in BTP by one standard deviation (i.e., a change of approximately 0.01) results in a response time decrease of about 0.8 m, all other covariates held constant.
9This seems to be the case in COCA: helpful discussion (FTP 0.00299) vs. careful discussion (FTP 0.000292) but help-ful (FTP 0.04073) vs. care-ful (0.1230 FTP).
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Keywords: individual differences, predictive processing, lexical integration, self-paced reading, age, reading ability, transition probability
Citation: McConnell K and Blumenthal-Dramé A (2021) Usage-Based Individual Differences in the Probabilistic Processing of Multi-Word Sequences. Front. Commun. 6:703351. doi: 10.3389/fcomm.2021.703351
Received: 30 April 2021; Accepted: 03 November 2021;
Published: 09 December 2021.
Edited by:
Phillip M. Alday, Max Planck Institute for Psycholinguistics, NetherlandsReviewed by:
Jeroen van Paridon, University of Wisconsin-Madison, United StatesChiara Celata, University of Urbino Carlo Bo, Italy
Copyright © 2021 McConnell and Blumenthal-Dramé. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Kyla McConnell, a3lsYS5tY2Nvbm5lbGxAYW5nbGlzdGlrLnVuaS1mcmVpYnVyZy5kZQ==