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The Journal of Neuroscience, September 15, 1998, 18(18):7519-7534
Modulation of Neuronal Activity in Superior Colliculus by Changes in Target Probability
Michele A. Basso and Robert H. Wurtz Laboratory of Sensorimotor Research, National Eye Institute, Bethesda, Maryland 20892
Complex visual scenes require that a target for an impending saccadic eye movement be selected from a larger number of possible targets. We investigated whether changing the probability that a visual stimulus would be selected as the target for a saccade altered activity of monkey superior colliculus (SC) neurons in two experiments. First, we changed the number of possible targets on each trial. Second, we kept the visual display constant and presented a single saccade target repeatedly so that target probability was established over time. Buildup neurons in the SC, those with delay period activity, showed a consistent reduction in activity as the probability of the saccade decreased, independent of the visual stimulus configuration. Other SC neurons, fixation and burst, were largely unaffected by the changes in saccade target probability. Because we had monkeys making saccades to many locations within the visual field, we could examine activity associated with saccades outside of the movement field of neurons. We found the activity of buildup neurons to be similar across the SC, before the target was identified, and reduced when the number of possible targets increased. The results of our experiments are consistent with a role for this activity in establishing a motor set. We found, consistent with this interpretation, that the activity of these neurons was predictive of the latency of a saccadic eye movement and not other saccade parameters such as end point or peak velocity.
Key words: monkey; saccade; motor set; target selection; decision; buildup neurons
Copyright © 1998 Society for Neuroscience 0270-6474/98/18187519-16$05.00/0
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