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J Neurophysiol (January 1, 2003). 10.1152/jn.00248.2002
Submitted on Submitted 5 April 2002; accepted in final form 13 September 2002
1Ahmanson-Lovelace Brain Mapping Center, Neuropsychiatric Institute, Departments of 2Neurology, 3Psychiatry and Biobehavioral Sciences, 4Pharmacology, and 5Radiological Sciences, 6Brain Research Institute, UCLA School of Medicine, Los Angeles, California 90095
Koski, Lisa,
Marco Iacoboni,
Marie-Charlotte Dubeau,
Roger P. Woods, and
John C. Mazziotta.
Modulation of Cortical Activity During Different Imitative
Behaviors. J. Neurophysiol. 89: 460-471, 2003. Imitation is a basic form of motor learning
during development. We have a preference to imitate the actions of
others as if looking in a mirror (specular imitation: i.e., when the
actor moves the left hand, the imitator moves the right hand) rather than with the anatomically congruent hand (anatomic imitation: i.e.,
actor and imitator both moving the right hand). We hypothesized that
this preference reflects changes in activity in previously described
frontoparietal cortical areas involved in directly matching observed
and executed actions (mirror neuron areas). We used functional magnetic
resonance imaging to study brain activity in normal volunteers imitating left and right hand movements with their right hand. Bilateral inferior frontal and right posterior parietal cortex were
more active during specular imitation compared with anatomic imitation
and control motor tasks. Furthermore this same pattern of activity was
also observed in the rostral part of the supplementary motor area
(SMA-proper) of the right hemisphere. These findings suggest that the
degree of involvement of frontoparietal mirror areas in imitation
depends on the nature of the imitative behavior, ruling out a
linguistic mediation of these areas in imitation. Moreover, activity in
the SMA appears to be tightly coupled to frontoparietal mirror areas
when subjects copy the actions of others.
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