Role of monkey superior colliculus in saccade averaging |
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Authors: | A. J. van Opstal J. A. M. van Gisbergen |
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Affiliation: | (1) Department of Medical Physics and Biophysics, Geert Grooteplein Noord 21, NL-6525 Nijmegen, EZ, The Netherlands |
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Abstract: | Summary We have investigated the involvement of collicular movement cells in the monkey in the execution of averaging saccades, elicited by a visual double-step stimulus. We found that, qualitatively, most (12/14) movement cells were recruited during averaging saccades in roughly the same way as for comparable visually-elicited saccades to single targets (V-saccades). However, movement-cell responses during averaging saccades in trials where the target suddenly changed direction were often less intense than for a comparable V-saccade. In these cases, the averaging responses were observed to be also slower than V-saccades of the same amplitude. Firing rate and double-step saccade dynamics were found to be significantly correlated in 9/14 cells tested. Several hypotheses for the collicular role in the generation of averaging saccades are discussed. |
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Keywords: | Superior colliculus Averaging saccades Movement cells Monkey |
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