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The Journal of Neurophysiology Vol. 81 No. 3 March 1999, pp. 1443-1448
Copyright ©1999 by the American Physiological Society
RAPID COMMUNICATION
1Department of Physiology,
Mushiake, Hajime,
Naotaka Fujii, and
Jun Tanji.
Microstimulation of the lateral wall of the intraparietal sulcus
compared with the frontal eye field during oculomotor tasks. We compared the effects of intracortical microstimulation (ICMS) of the
lateral wall of the intraparietal sulcus (LIP) with those of ICMS of
the frontal eye field (FEF) on monkeys performing oculomotor tasks.
When ICMS was applied during a task that involved fixation, contraversive saccades evoked in the LIP and FEF appeared similar. When
ICMS was applied to the FEF at the onset of voluntary saccades, the
evoked saccades collided with the ongoing voluntary saccade so that the
trajectory of voluntary saccade was compensated by the stimulus. Thus
the resultant saccade was redirected and came close to the endpoint of
saccades evoked from the fixation point before the start of voluntary
saccade. In contrast, when ICMS was applied to the LIP at the onset of
voluntary saccades, the resultant saccade followed a trajectory that
was different from that evoked from the FEF. In that case, the
colliding saccades were redirected toward an endpoint that was close to
the endpoint of saccades evoked when animals were already fixating at
the target of the voluntary saccade. This finding suggests that the
colliding saccade was directed toward an endpoint calculated with
reference to the target of the voluntary saccade. We hypothesize that,
shortly before initiation of voluntary saccades, a dynamic process
occurs in the LIP so that the reference point for calculating the
saccade target shifts from the fixation point to the target of a
voluntary saccade. Such predictive updating of reference points seems
useful for immediate reprogramming of upcoming saccades that can occur in rapid succession.
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