Cerebral Cortex Advance Access originally published online on October 13, 2004
Cerebral Cortex 2005 15(7):929-937; doi:10.1093/cercor/bhh193
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Cerebral Cortex V 15 N 7 © Oxford University Press 2004; all rights reserved
Involvement of the Ventral Premotor Cortex in Controlling Image Motion of the Hand During Performance of a Target-capturing Task
1 Department of Physiology, Tohoku University school of Medicine, Japan, 2 Miyagi Organization for Industry Promotion, Sendai, Japan and 3 The Core Research for Evolutional Science and Technology Program, Japan
Address correspondence to Jun Tanji, Department of Physiology, Tohoku University School of Medicine, 2-1 Seiryo-Cho, Aoba-Ku, Sendai 980, Japan. Email: tanjij{at}mail.tains.tohoku.ac.jp
The ventral premotor cortex (PMv) has been implicated in the visual guidance of movement. To examine whether neuronal activity in the PMv is involved in controlling the direction of motion of a visual image of the hand or the actual movement of the hand, we trained a monkey to capture a target that was presented on a video display using the same side of its hand as was displayed on the video display. We found that PMv neurons predominantly exhibited premovement activity that reflected the image motion to be controlled, rather than the physical motion of the hand. We also found that the activity of half of such direction-selective PMv neurons depended on which side (left versus right) of the video image of the hand was used to capture the target. Furthermore, this selectivity for a portion of the hand was not affected by changing the starting position of the hand movement. These findings suggest that PMv neurons play a crucial role in determining which part of the body moves in which direction, at least under conditions in which a visual image of a limb is used to guide limb movements.
Key Words: arm movement • frame of reference • image motion • premotor cortex
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