Tuning in to real-time social interactions in macaques

Area of Science:

• Neuroscience
• Primatology
• Social Behavior

Background:

• Movement synchronization between individuals is linked to social cohesion.
• The neural control of interindividual motor entrainment is poorly understood due to a lack of suitable animal models.
• Understanding social motor entrainment is crucial for deciphering group cohesion mechanisms.

Purpose of the Study:

• To investigate social motor entrainment in a non-human primate model.
• To explore the factors influencing motor entrainment in paired macaques.
• To establish a behavioral platform for studying the neural basis of social cohesion.

Main Methods:

• Observed macaque monkeys performing repetitive arm movements for horizontal bar sliding.
• Analyzed phase coherence of movements between paired animals.
• Manipulated social context by using prerecorded videos versus live interaction.

Main Results:

• Macaque monkeys exhibited spontaneous, phase-coherent arm movement synchronization (social motor entrainment).
• Motor entrainment was specific to animal pairs, consistent over time, visually dependent, and influenced by social hierarchy.
• Entrainment was significantly reduced when monkeys interacted with recorded movements compared to live partners.

Conclusions:

• Social motor entrainment is facilitated by real-time social exchanges, not just observation of movement.
• This study provides a novel animal model for investigating the neural underpinnings of social bonding and group cohesion.
• Findings suggest conserved mechanisms for social entrainment across species.