AUTHOR=Astle Duncan E., Scerif Gaia , Kuo Bo-Cheung , Nobre Anna C. TITLE=Spatial selection of features within perceived and remembered objects JOURNAL=Frontiers in Human Neuroscience VOLUME=3 YEAR=2009 URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/neuro.09.006.2009 DOI=10.3389/neuro.09.006.2009 ISSN=1662-5161 ABSTRACT=

Our representation of the visual world can be modulated by spatially specific attentional biases that depend flexibly on task goals. We compared searching for task-relevant features in perceived versus remembered objects. When searching perceptual input, selected task-relevant and suppressed task-irrelevant features elicited contrasting spatiotopic ERP effects, despite them being perceptually identical. This was also true when participants searched a memory array, suggesting that memory had retained the spatial organization of the original perceptual input and that this representation could be modulated in a spatially specific fashion. However, task-relevant selection and task-irrelevant suppression effects were of the opposite polarity when searching remembered compared to perceived objects. We suggest that this surprising result stems from the nature of feature- and object-based representations when stored in visual short-term memory. When stored, features are integrated into objects, meaning that the spatially specific selection mechanisms must operate upon objects rather than specific feature-level representations.