Neural network simulations of the primate oculomotor system III. An one-dimensional, one-directional model of the superior colliculus |
| |
Authors: | A Bozis A K Moschovakis |
| |
Institution: | (1) Division of Computational Neuroscience, Institute of Applied and Computational Mathematics, FO.R.T.H., and Department of Basic Sciences, Faculty of Medicine, University of Crete, Iraklion, Greece, GR |
| |
Abstract: | This report evaluates the performance of a biologically motivated neural network model of the primate superior colliculus
(SC). Consistent with known anatomy and physiology, its major features include excitatory connections between its output elements,
nigral gating mechanisms, and an eye displacement feedback of reticular origin to recalculate the metrics of saccades to memorized
targets in retinotopic coordinates. Despite the fact that it makes no use of eye position or eye velocity information, the
model can account for the accuracy of saccades in double step stimulation experiments. Further, the model accounts for the
effects of focal SC lesions. Finally, it accounts for the properties of saccades evoked in response to the electrical stimulation
of the SC. These include the approximate size constancy of evoked saccades despite increases of stimulus intensity, the fact
that the size of evoked saccades depends on the time that has elapsed from a previous saccade, the fact that staircases of
saccades are evoked in response to prolonged stimuli, and the fact that the size of saccades evoked in response to the simultaneous
stimulation of two SC sites is the average of the saccades that are evoked when the two sites are separately stimulated.
Received: 3 November 1997 / Accepted in revised form: 30 June 1998 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|