Integrative and distinctive coding of visual and conceptual object features in the ventral visual stream

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Computational Neuroscience

Background:

• Understanding object concept representation in the brain is a key goal in cognitive neuroscience.
• The neural basis for integrating visual and abstract conceptual features of objects remains unclear.

Purpose of the Study:

• To investigate whether and where visual and abstract conceptual features of object concepts are integrated in the human brain.
• To compare neural pattern similarities with behavior-based models of visual and conceptual similarities.

Main Methods:

• Used functional magnetic resonance imaging (fMRI) to measure brain activity evoked by object stimuli.
• Compared fMRI-based neural pattern similarities with computational models of visual and conceptual feature similarities.
• Employed searchlight analysis to determine the neuroanatomical specificity of feature integration.

Main Results:

• Distinct coding of visual features was observed in the lateral occipital cortex.
• Conceptual features were distinctly coded in the temporal pole and parahippocampal cortex.
• The perirhinal cortex showed evidence for integrative coding of both visual and conceptual object features.

Conclusions:

• The perirhinal cortex plays a unique role in representing fully specified object concepts.
• Integration of visual and conceptual features occurs in the perirhinal cortex.
• Findings elucidate the neural mechanisms underlying object concept representation.