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Abstract Action observation facilitates corticospinal excitability. This is presumably due to a premotor neural
 

Summary: Abstract Action observation facilitates corticospinal
excitability. This is presumably due to a premotor neural
system that is active when we perform actions and when
we observe actions performed by others. It has been
speculated that this neural system is a precursor of neural
systems subserving language. If this theory is true, we
may expect hemispheric differences in the motor facilita-
tion produced by action observation, with the language-
dominant left hemisphere showing stronger facilitation
than the right hemisphere. Furthermore, it has been sug-
gested that body parts are recognized via cortical regions
controlling sensory and motor processing associated with
that body part. If this is true, then corticospinal facilita-
tion during action observation should be modulated by
the laterality of the observed body part. The present
study addressed these two issues using TMS for each
motor cortex separately as participants observed actions
being performed by a left hand, a right hand, or a control
stimulus on the computer screen. We found no overall
difference between the right and left hemisphere for mo-

  

Source: Aziz-Zadeh, Lisa - Brain and Creativity Institute & Department of Occupational Science, University of Southern California

 

Collections: Biology and Medicine