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Two Brains in Action: Joint-Action Coding in the Primate Frontal Cortex.

Simone Ferrari-Toniolo1, Federica Visco-Comandini1, Alexandra Battaglia-Mayer2

  • 1Department of Physiology and Pharmacology, SAPIENZA University of Rome, 00185 Rome, Italy.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
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Summary
This summary is machine-generated.

Researchers discovered "joint-action cells" in monkeys that coordinate actions with partners. These neurons accurately represent cooperative behaviors, offering insights into neural mechanisms for intersubject motor control.

Keywords:
interpersonal coordinationjoint-actionmonkeysmotor systemspremotor cortexsocial interactions

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Area of Science:

  • Neuroscience
  • Primate Behavior
  • Motor Control

Background:

  • Coordinating actions with others is crucial for daily life.
  • Neural mechanisms for primate motor coordination remain largely unknown.
  • Previous research focused on individual motor control, not interactive contexts.

Purpose of the Study:

  • Investigate neural mechanisms of visuomotor coordination in primates.
  • Identify neural correlates of cooperative action in the dorsal premotor cortex (PMd).
  • Characterize the properties of neurons involved in joint actions.

Main Methods:

  • Simultaneous electrophysiological recordings from the PMd of two interacting male monkeys.
  • Monkeys were trained to coordinate hand forces for a common goal.
  • Analysis of neural activity during individual and cooperative tasks, including action observation.

Main Results:

  • Identified a population of
  • joint-action cells
  • preferentially active during cooperative tasks.
  • These cells showed predictive modulation, with neural activity preceding behavioral changes.
  • Joint-action cells encoded joint-performance more accurately than canonical action-related cells.
  • Decoding joint-action required combining activity from both brains.
  • Action observation did not enhance joint-action cell accuracy; performance degraded with non-interactive partners.

Conclusions:

  • The dorsal premotor cortex (PMd) plays a key role in integrating self and other representations for visuomotor coordination.
  • Joint-action cells provide a neural substrate for successful intersubject motor coordination.
  • Findings offer novel insights into the neural basis of social motor behavior.