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The Journal of Neurophysiology Vol. 84 No. 3 September 2000, pp. 1667-1672
Copyright ©2000 by the American Physiological Society
RAPID COMMUNICATION
1Department of Physiology and 2Department of Radiology, Hirosaki University School of Medicine; and 3Division of Radiology, Hirosaki University Hospital, Hirosaki 036-8562, Japan
Kurata, Kiyoshi,
Toshiaki Tsuji,
Satoshi Naraki,
Morio Seino, and
Yoshinao Abe.
Activation of the Dorsal Premotor Cortex and Pre-Supplementary
Motor Area of Humans During an Auditory Conditional Motor Task. J. Neurophysiol. 84: 1667-1672, 2000. Using
functional magnetic resonance imaging (fMRI), we measured
regional blood flow to examine which motor areas of the human cerebral
cortex are preferentially involved in an auditory conditional motor
behavior. As a conditional motor task, randomly selected 330 or 660 Hz
tones were presented to the subjects every 1.0 s. The low and high
tones indicated that the subjects should initiate three successive
opposition movements by tapping together the right thumb and index
finger or the right thumb and little finger, respectively. As a control
task, the same subjects were asked to alternate the two opposition
movements, in response to randomly selected tones that were presented
at the same frequencies. Between the two tasks, MRI images were also
scanned in the resting state while the tones were presented in the same
way. Comparing the images during each of the two tasks with images
during the resting state, it was observed that several frontal motor
areas, including the primary motor cortex, dorsal premotor cortex
(PMd), supplementary motor area (SMA), and pre-SMA, were activated.
However, preferential activation during the conditional motor task was
observed only in the PMd and pre-SMA of the subjects' left
(contralateral) frontal cortex. The PMd has been thought to play an
important role in transforming conditional as well as spatial visual
cues into corresponding motor responses, but our results suggest that
the PMd along with the pre-SMA are the sites where more general and
extensive sensorimotor integration takes place.
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