Mid-superior temporal sulcus encodes spatial context and behavioral state in freely moving macaques

Area of Science:

• Neuroscience
• Primate behavior
• Neural encoding

Background:

• Traditional primate neuroscience research often uses constrained environments.
• The mid-superior temporal sulcus (mSTS) is linked to social perception.
• The role of mSTS during unconstrained, naturalistic behavior remains largely unexplored.

Purpose of the Study:

• To investigate neural function in the mSTS during unconstrained behavior in primates.
• To understand how mSTS neural populations represent spatial information and behavioral states during naturalistic exploration.

Main Methods:

• Wireless depth-electrode recordings from both banks of the mSTS in macaques.
• Simultaneous 3D pose tracking and behavioral segmentation.
• Development of neural encoding models and population manifold analysis.

Main Results:

• mSTS firing rates were modulated by spatial position, body kinematics, and visual cues, with a shift from allocentric to body-centric encoding during vertical movement.
• Neural populations contained decodable information about behavioral sequences with strong temporal generalization.
• Population dynamics revealed structured organization related to behavioral transitions and spatial context.

Conclusions:

• mSTS neural populations integrate spatial context and behavioral state information during naturalistic behavior.
• This study provides insights into the neural mechanisms underlying complex behaviors in primates.
• Findings challenge traditional views by demonstrating mSTS function beyond social perception in unconstrained settings.