Electrophysiology of action representation

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Control

Background:

• Actions are fundamental to expressing goals and desires.
• Electrophysiological studies reveal goal-related organization of actions in the brain.
• The motor system's role extends beyond direct physical action.

Purpose of the Study:

• To review experimental data on the brain's organization of actions.
• To explore the non-strictly motor applications of the motor schema vocabulary.
• To investigate how action representations are stored and accessed in humans.

Main Methods:

• Review of electrophysiological experiments in monkeys and humans.
• Analysis of data from inferior premotor cortex and visuomotor neurons (mirror neurons).
• Examination of motor excitability changes during motor imagery, action/object observation, and speech listening.

Main Results:

• Inferior premotor cortex and mirror neurons show goal-related organization.
• Monkey experiments demonstrate visuomotor neurons responding to observed actions.
• Human data reveal that the motor system is activated by action-related thoughts, imagery, and observations.

Conclusions:

• The brain utilizes a "vocabulary of motor schemata" for organizing actions.
• This motor system is engaged not only in performing actions but also in observing, imagining, and even hearing about them.
• Action representations are stored and addressed in a manner that involves widespread motor system activation.