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The Journal of Neurophysiology Vol. 87 No. 1 January 2002, pp. 333-350
Copyright ©2002 by the American Physiological Society
Center for the Neural Basis of Cognition, Mellon Institute, Pittsburgh, Pennsylvania 15213-2683
Tremblay, Léon,
Sonya N. Gettner, and
Carl R. Olson.
Neurons With Object-Centered Spatial Selectivity in Macaque SEF:
Do They Represent Locations or Rules?. J. Neurophysiol. 87: 333-350, 2002. In macaque monkeys
performing a task that requires eye movements to the leftmost or
rightmost of two dots in a horizontal array, some neurons in the
supplementary eye field (SEF) fire differentially according to which
side of the array is the target regardless of the array's location on
the screen. We refer to these neurons as exhibiting selectivity for
object-centered location. This form of selectivity might arise from
involvement of the neurons in either of two processes: representing the
locations of targets or representing the rules by which targets are
selected. To distinguish between these possibilities, we monitored
neuronal activity in the SEF of two monkeys performing a task that
required the selection of targets by either an object-centered spatial
rule or a color rule. On each trial, a sample array consisting of two
side-by-side dots appeared; then a cue flashed on one dot; then the
display vanished and a delay ensued. Next a target array consisting of two side-by-side dots appeared at an unpredictable location and another
delay ensued; finally the monkey had to make an eye movement to one of
the target dots. On some trials, the monkey had to select the dot on
the same side as the cue (right or left). On other trials, he had to
select the target of the same color as the cue (red or green). Neuronal
activity robustly encoded the object-centered locations first of the
cue and then of the target regardless of the whether the monkey was
following a rule based on object-centered location or color. Neuronal
activity was at most weakly affected by the type of rule the monkey was
following (object-centered-location or color) or by the color of the
cue and target (red or green). On trials involving a color rule,
neuronal activity was moderately enhanced when the cue and target
appeared on opposite sides of their respective arrays. We conclude that
the general function of SEF neurons selective for object-centered
location is to represent where the cue and target are in their
respective arrays rather than to represent the rule for target selection.
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