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IPM
30
YEARS OLD

“School of Cognitive Sciences”

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Paper   IPM / Cognitive Sciences / 14453
School of Cognitive Sciences
  Title:   Temporal dynamics of visual category representation in the macaque inferior temporal cortex
  Author(s): 
1.  M.R.A. Dehaqani
2.  A. Vahabie
3.  R. Kiani
4.  M. Ahmadabadi
5.  B. Araabi
6.  H. Esteky
  Status:   Published
  Journal: Journal of Neurophysiology
  Vol.:  116
  Year:  2016
  Pages:   587-601
  Supported by:  IPM
  Abstract:
Object categories are recognized at multiple levels of hierarchical abstractions. Psychophysical studies have shown a more rapid perceptual access to the mid-level category information (e.g., human faces) than the higher (superordinate; e.g., animal) or the lower (subordinate; e.g., face identity) level. Mid-level category members share many features, whereas few features are shared among members of different mid-level categories. To understand better the neural basis of expedited access to mid-level category information, we examined neural responses of the inferior temporal (IT) cortex of macaque monkeys viewing a large number of object images. We found an earlier representation of mid-level categories in the IT population and single-unit responses compared with superordinate- and subordinate-level categories. The short-latency representation of mid-level category information shows that visual cortex first divides the category shape space at its sharpest boundaries, defined by high/low within/between-group similarity. This short-latency, mid-level category boundary map may be a prerequisite for representation of other categories at more global and finer scales.

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