When far becomes near: shared environments activate action simulation.

Area of Science:

• Cognitive Neuroscience
• Motor Control
• Social Cognition

Background:

• Action understanding and prediction can be achieved through action simulation, where observing actions activates similar motor processes in the observer.
• Motor priming, such as altered reach trajectories after observing obstacle negotiation, demonstrates this simulation effect.
• Traditionally, action simulation is thought to be restricted to observed actions within near (peripersonal) space.

Purpose of the Study:

• To investigate whether action simulation extends beyond peripersonal space under shared action environment conditions.
• To explore the influence of object ownership on action simulation when potential obstacles are in extrapersonal space.

Main Methods:

• Participants observed actions involving obstacle avoidance.
• Reach trajectories were analyzed to assess motor priming effects.
• Experimental conditions manipulated the spatial location (peripersonal vs. extrapersonal) of the observed action and the ownership of the obstacle.

Main Results:

• Action simulation, evidenced by altered reach trajectories, occurred even for actions in far (extrapersonal) space when individuals shared action environments.
• The ownership of an object, even when it served as a potential obstacle in extrapersonal space, evoked action simulations.
• These simulations resulted in more stable memory traces that influenced subsequent behavior.

Conclusions:

• Action simulation is not strictly limited to peripersonal space and can be modulated by shared action environments.
• Object ownership is a significant factor influencing action simulation, extending its reach into extrapersonal space.
• Action simulation, particularly when influenced by ownership, plays a role in memory formation and future behavioral adaptation.