AUTHOR=Bourguignon Nicolas J. , Baum Shari R. , Shiller Douglas M. 

TITLE=Lexical-perceptual integration influences sensorimotor adaptation in speech

JOURNAL=Frontiers in Human Neuroscience

VOLUME=8

YEAR=2014

URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2014.00208

DOI=10.3389/fnhum.2014.00208

ISSN=1662-5161

ABSTRACT=<p>A combination of lexical bias and altered auditory feedback was used to investigate the influence of higher-order linguistic knowledge on the perceptual aspects of speech motor control. Subjects produced monosyllabic real words or pseudo-words containing the vowel [ε] (as in “head”) under conditions of altered auditory feedback involving a decrease in vowel first formant (F1) frequency. This manipulation had the effect of making the vowel sound more similar to [I] (as in “hid”), affecting the lexical status of produced words in two <italic>Lexical-Change</italic> (LC) groups (either changing them from real words to pseudo-words: e.g., <italic>less</italic>—<italic>liss</italic>, or pseudo-words to real words: e.g., <italic>kess</italic>—<italic>kiss</italic>). Two <italic>Non-Lexical-Change</italic> (NLC) control groups underwent the same auditory feedback manipulation during the production of [ε] real- or pseudo-words, only without any resulting change in lexical status (real words to real words: e.g., <italic>mess</italic>—<italic>miss</italic>, or pseudo-words to pseudo-words: e.g., <italic>ness</italic>—<italic>niss</italic>). The results from the LC groups indicate that auditory-feedback-based speech motor learning is sensitive to the lexical status of the stimuli being produced, in that speakers tend to keep their acoustic speech outcomes within the auditory-perceptual space corresponding to the task-related side of the word/non-word boundary (real words or pseudo-words). For the NLC groups, however, no such effect of lexical status is observed.</p>