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Priming of reach trajectory when observing actions: hand-centred effects
Debra Griffiths1, Steven P Tipper
1Centre for Clinical and Cognitive Neuroscience, Bangor University, Bangor, UK. psp41a@bangor.ac.uk
Quarterly Journal of Experimental Psychology (2006)
|September 5, 2009
Summary
Observing others
Area of Science:
- Cognitive Neuroscience
- Motor Control
- Action Observation
Background:
- Human action observation triggers simulation of observed actions.
- Simulation is primarily concerned with achieving behavioral goals, not specific movement parameters.
Purpose of the Study:
- To investigate if observing reach trajectories influences an observer's subsequent reach path.
- To determine the conditions under which reach path priming occurs.
Main Methods:
- Participants observed actions of another person reaching around an obstacle.
- Participant's subsequent reach trajectory was analyzed for curvature.
- Varied conditions included shared goals, perspectives, and obstacle presence within action space.
Main Results:
- Observing an obstacle-avoiding reach increased the curvature of the observer's subsequent reach.
- This reach path priming effect was independent of shared goals and viewing perspective.
- Priming was contingent on the obstacle being within the observer's action (peripersonal) space.
Conclusions:
- Action observation primes specific motor parameters, such as reach trajectory.
- The observer's peripersonal space is critical for this motor priming effect.
- This suggests a sophisticated mechanism for adapting motor behavior based on observed actions within one's own space.
