Inferotemporal face patches are histo-architectonically distinct.

Area of Science:

• Neuroscience
• Primate Visual Cortex Research
• Cortical Microarchitecture

Background:

• The primate inferotemporal cortex contains a network crucial for face perception.
• Understanding the microarchitecture of this network is key to explaining visual perception mechanisms.

Purpose of the Study:

• To investigate the histo-architectural differences within the macaque face perception network.
• To integrate in vivo and ex vivo measurements for precise mapping of face patches.

Main Methods:

• Acquired a unique dataset in macaque monkeys.
• Combined functional Magnetic Resonance Imaging (fMRI) for in vivo localization of face patches.
• Utilized ex vivo histology for high-resolution analysis of histo-architecture across cortical depths in the same individuals.

Main Results:

• Identified distinct differences in face patches based on cytochrome oxidase (CO) and myelin staining.
• Observed pronounced CO staining in the middle lateral (ML) face patch.
• Noted that histo-architectonic differences were less apparent with probabilistic face patch definitions.

Conclusions:

• The macaque face patch network comprises architectonically distinct components.
• Precision mapping integrating in vivo and ex vivo data is crucial for discerning these differences.
• This research refines mechanistic accounts of visual perception networks.