Basic level category structure emerges gradually across human ventral visual cortex

Marius CĂTĂLin Iordan, Michelle R. Greene, Diane M Beck, Li Fei-Fei

Research output: Contribution to journalArticle

Abstract

Objects can be simultaneously categorized at multiple levels of specificity ranging from very broad (“natural object”) to very distinct (“Mr. Woof”), with a mid-level of generality (basic level: “dog”) often providing the most cognitively useful distinction between categories. It is unknown, however, how this hierarchical representation is achieved in the brain. Using multivoxel pattern analyses, we examined how well each taxonomic level (superordinate, basic, and subordinate) of real-world object categories is represented across occipitotemporal cortex. We found that, although in early visual cortex objects are best represented at the subordinate level (an effect mostly driven by low-level feature overlap between objects in the same category), this advantage diminishes compared to the basic level as we move up the visual hierarchy, disappearing in object-selective regions of occipitotemporal cortex. This pattern stems from a combined increase in within-category similarity (category cohesion) and between-category dissimilarity (category distinctiveness) of neural activity patterns at the basic level, relative to both subordinate and superordinate levels, suggesting that successive visual areas may be optimizing basic level representations.

Original languageEnglish (US)
Pages (from-to)1427-1446
Number of pages20
JournalJournal of cognitive neuroscience
Volume27
Issue number7
DOIs
StatePublished - Jul 1 2015

ASJC Scopus subject areas

  • Cognitive Neuroscience

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