Overlapping but distinct: Distal connectivity dissociates hand and tool processing networks.

Area of Science:

• Neuroscience
• Cognitive Science
• Computational Neuroscience

Background:

• Object recognition relies on complex information processing principles.
• While local computations and feedback/feedforward connections are established, distal computations' role is emerging.
• Understanding the interplay between long-range connectivity and local functional organization is key.

Purpose of the Study:

• To investigate the relationship between long-range connectivity and local functional organization in object recognition.
• To explore how category-specific information is processed in overlapping brain regions.
• To determine if connectivity patterns correlate with category-specific representations.

Main Methods:

• Utilized functional connectivity analysis to link distal areas with local voxel-wise category preferences.
• Focused on the inferior parietal lobule/anterior intraparietal sulcus (IPL/aIPS) and posterior middle temporal gyrus/lateral occipital temporal cortex (pMTG/LOTC), known for overlapping tool and hand preferences.
• Examined connectivity from these overlap regions to specialized tool and hand processing areas in the ventral temporal cortex.

Main Results:

• Functional connections of the overlapping regions (IPL/aIPS and pMTG/LOTC) correlated with category preferences for tools and hands independently.
• Demonstrated that these regions maintain object topography in a category-specific manner.
• Evidence suggests a category-specific flow of information crucial for object representation.

Conclusions:

• Object processing regions that handle multiple categories, like tools and hands, maintain distinct topographical organization.
• This category-specific organization supports specialized information processing streams.
• The findings contribute to understanding the neural basis of object recognition and representation.