Reaction time for object categorization is predicted by representational distance

Thomas A. Carlson, J. Brendan Ritchie, Nikolaus Kriegeskorte, Samir Durvasula, Junsheng Ma

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41 Citations (Scopus)
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How does the brain translate an internal representation of an object into a decision about the object's category? Recent studies have uncovered the structure of object representations in inferior temporal cortex (IT) using multivariate pattern analysis methods. These studies have shown that representations of individual object exemplars in IT occupy distinct locations in a high-dimensional activation space, with object exemplar representations clustering into distinguishable regions based on category (e.g., animate vs. inanimate objects). In this study, we hypothesized that a representational boundary between category representations in this activation space also constitutes a decision boundary for categorization. We show that behavioral RTs for categorizing objects are well described by our activation space hypothesis. Interpreted in terms of classical and contemporary models of decision-making, our results suggest that the process of settling on an internal representation of a stimulus is itself partially constitutive of decisionmaking for object categorization.

Original languageEnglish
Pages (from-to)132-142
Number of pages11
JournalJournal of cognitive neuroscience
Issue number1
Publication statusPublished - Jan 2014

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Copyright the Publisher 2013. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


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