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How many motoric body representations can we grasp?
Marjolein P M Kammers1, Joyce A Kootker, Hinze Hogendoorn
1Helmholtz Institute, Experimental Psychology Division, Utrecht University, Utrecht, The Netherlands. m.kammers@ucl.ac.uk
Experimental Brain Research
|December 30, 2009
Summary
This study explored the body schema, which guides actions, using a rubber hand illusion. Researchers found that grasping responses were altered by the illusion, challenging previous beliefs about its robustness.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Body Representation
Background:
- Debate exists regarding the number of body representations in the brain.
- Common dichotomy: body image (perception, illusion-susceptible) vs. body schema (action guidance, illusion-robust).
Purpose of the Study:
- Investigate the susceptibility of the body schema to illusions.
- Challenge the established dichotomy between body image and body schema.
Main Methods:
- Utilized a rubber hand illusion paradigm.
- Manipulated stimulation on both hands and postural configuration.
- Assessed grasping responses instead of pointing responses.
Main Results:
- Demonstrated for the first time that grasping responses can be altered by the rubber hand illusion.
- Observed changes in grip aperture of the rubber hand influenced motor responses.
Conclusions:
- The body schema is susceptible to bodily illusions, contrary to prior hypotheses.
- The type of response (e.g., grasping) and illusion induction methods are critical for studying body representations.
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