AI Insight
Researchers compared brain activity in the inferotemporal (IT) cortex of both humans and macaques as both species viewed the same set of 8,640 naturalistic object images. Using cross-species alignment techniques, they identified a shared high-dimensional representational geometry in IT cortex that encodes both low-level visual properties and higher-level conceptual categories. Beyond these shared organizational principles, they also detected systematic species-specific differences related to visual features, distinctions between living and non-living objects, and abstract conceptual processing.
Why it matters
Understanding which aspects of primate brain organization are conserved across species versus species-specific helps clarify the validity of using macaque models to study human vision and cognition. These findings also have implications for the development of more biologically realistic artificial vision systems and for interpreting animal model research in the context of human neuroscience.
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Inferotemporal (IT) cortex is central to primate object vision, yet we still lack a systematic understanding of which aspects of its functional organization generalize across humans and macaques, and which are species-specific. Here, we compared large-scale macaque multi-unit activity and human fMRI responses to 8,640 naturalistic object images shown to both species. Using multivariate cross-species alignment, we identified a shared high-dimensional geometry with representational axes that capture both visual properties and conceptual structure. A factorization of this continuous space further resolved a large set of interpretable dimensions shared across species. Beyond these commonalities, contrasting the within-species spaces revealed systematic asymmetries related to visual features, living and non-living categories, and higher-level concepts. Together, these findings provide a data-driven account of primate IT organization across object space, clarify the scope and limits of cross-species comparability, and establish cross-species alignment as a framework for mapping shared and species-specific dimensions.
Source: Shared and Distinct Object Spaces in Human and Macaque Inferotemporal Cortex