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J Neurophysiol (March 1, 2003). 10.1152/jn.00883.2002
Submitted on Submitted 30 October 2002; accepted in final form 18 November 2002
1Division of Biology, California Institute of Technology, Pasadena, California 91125; and 2Department of Psychology, University of Western Ontario, London, Ontario N6A5C2, Canada
Scherberger, Hansjörg,
Melvyn A. Goodale, and
Richard A. Andersen.
Target Selection for Reaching and Saccades Share a Similar
Behavioral Reference Frame in the Macaque. J. Neurophysiol. 89: 1456-1466, 2003. The selection of one of two visual
stimuli as a target for a motor action may depend on external as well
as internal variables. We examined whether the preference to select a
leftward or rightward target depends on the action that is performed
(eye or arm movement) and to what extent the choice is influenced by
the target location. Two targets were presented at the same distance to
the left and right of a fixation position and the stimulus onset
asynchrony (SOA) was adjusted until both targets were selected equally
often. This balanced SOA time is then a quantitative measure
of selection preference. In two macaque monkeys tested, we found the
balanced SOA shifted to the left side for left-arm movements and to the right side for right-arm movements. Target selection strongly depended
on the horizontal target location. By varying eye, head, and trunk
position, we found this dependency embedded in a head-centered behavioral reference frame for saccade targets and, somewhat
counter-intuitively, for reach targets as well. Target selection for
reach movements was influenced by the eye position, while saccade
target selection was unaffected by the arm position. These findings
suggest that the neural processes underlying target selection for a
reaching movement are to a large extent independent of the coordinate
frame ultimately used to make the limb movement, but are instead
closely linked to the coordinate frame used to plan a saccade to that target. This similarity may be indicative of a common spatial framework
for hand-eye coordination.
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