The neural coding of face and body orientation in occipitotemporal cortex

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Visual Perception

Background:

• Understanding human actions, intentions, and social interactions relies on perceiving face and body orientation.
• Previous research indicates distinct occipitotemporal brain region responses to faces and bodies of varying orientations.
• The extent of overlap or separation in neural networks processing face versus body orientation remains unclear due to separate investigation methods.

Purpose of the Study:

• To investigate whether face and body orientation are processed by overlapping or separate neural networks.
• To identify brain regions involved in processing face and body orientation.
• To determine if these regions encode orientation in a stimulus-independent manner.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to record brain activity.
• Multivoxel pattern analysis (MVPA) was applied to fMRI data.
• Participants viewed faces and bodies at different orientations while attending to either orientation or identity.

Main Results:

• Neural response patterns in occipitotemporal areas (occipital face area, extrastriate body area, lateral occipital complex, early visual cortex) generalized across faces and bodies for orientation.
• This suggests a stimulus-independent encoding of person orientation in these regions.
• The fusiform face area showed face-specific orientation responses, not body-specific.
• Attention to orientation or identity did not significantly alter orientation processing responses.

Conclusions:

• Face and body orientation are processed by partially overlapping brain networks.
• The occipitotemporal cortex utilizes a stimulus-independent neural code for person orientation.
• Orientation processing in the fusiform face area is specific to faces.