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The Journal of Neurophysiology Vol. 83 No. 4 April 2000, pp. 2392-2411
Copyright ©2000 by the American Physiological Society
Center for the Neural Basis of Cognition, Mellon Institute, Pittsburgh, Pennsylvania 15213-2683
Olson, Carl R. and
Léon Tremblay.
Macaque Supplementary Eye Field Neurons Encode Object-Centered
Locations Relative to Both Continuous and Discontinuous Objects. J. Neurophysiol. 83: 2392-2411, 2000. Many neurons in the supplementary eye field (SEF) of the
macaque monkey fire at different rates before eye movements to the right or the left end of a horizontal bar regardless of the bar's location in the visual field. We refer to such neurons as carrying object-centered directional signals. The aim of the present study was
to throw light on the nature of object-centered direction selectivity
by determining whether it depends on the reference image's physical
continuity. To address this issue, we recorded from 143 neurons in two
monkeys. All of these neurons were located in a region coincident with
the SEF as mapped out in previous electrical stimulation studies and
many exhibited task-related activity in a standard saccade task. In
each neuron, we compared neuronal activity across trials in which the
monkey made eye movements to the right or left end of a reference
image. On interleaved trials, the reference image might be either a
horizontal bar or a pair of discrete dots in a horizontal array. The
dominant effect revealed by this experiment was that neurons
selectively active before eye movements to the right (or left) end of a
bar were also selectively active before eye movements to the right (or left) dot in a horizontal array. An additional minor effect, present in
around a quarter of the sample, took the form of a difference in firing
rate between bar and dot trials, with the greater level of activity
most commonly associated with dot trials. These phenomena could not be
accounted for by minor intertrial differences in the physical
directions of eye movements. In summary, SEF neurons carry
object-centered signals and carry these signals regardless of whether
the reference image is physically continuous or disjunct.
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