Shared population-level dynamics in monkey premotor cortex during solo action, joint action and action observation

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Neuroscience

Background:

• Neural population dynamics in motor areas are crucial for understanding motor behavior.
• Previous studies suggested dorsal premotor cortex (PMd) primarily handles motor generation and timing.

Purpose of the Study:

• To investigate neural dynamics in PMd during individual and cooperative action execution versus observation.
• To determine if PMd encodes task-specific demands or general spatial information.

Main Methods:

• Monkeys performed visuomotor tasks (individual/cooperative) and an observation task.
• Recorded neural activity in PMd during these tasks.
• Analyzed neural population dynamics to compare conditions.

Main Results:

• Neural dynamics in PMd were broadly shared across action execution and observation.
• Cursor motion directions were more accurately discriminated than task types in PMd.
• The largest components of PMd dynamics did not solely reflect movement execution.

Conclusions:

• PMd encodes spatial aspects of actions, independent of specific behavioral contexts.
• PMd dynamics may represent higher cognitive-motor processes, including covert action representation.
• Findings challenge the view of PMd solely as a movement execution planner.