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Influence of the superior colliculus on responses of lateral geniculate neurons in the cat

Published online by Cambridge University Press:  02 June 2009

Jin-Tang Xue ,
Charlene B.Y. Kim ,
Rodney J. Moore  and
Peter D. Spear
Jin-Tang Xue
Affiliation:
Department of Psychology and Center for Neuroscience, University of Wisconsin, Madison
Charlene B.Y. Kim
Affiliation:
Department of Psychology and Center for Neuroscience, University of Wisconsin, Madison
Rodney J. Moore
Affiliation:
Department of Psychology and Center for Neuroscience, University of Wisconsin, Madison
Peter D. Spear
Affiliation:
Department of Psychology and Center for Neuroscience, University of Wisconsin, Madison
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Abstract

The superior colliculus (SC) projects to all layers of the cat's lateral geniculate nucleus (LGN) and thus is in a position to influence information transmission through the LGN. We investigated the function of the tecto-geniculate pathway by studying the responses of cat LGN neurons before, during, and after inactivating the SC with microinjections of lidocaine. The LGN cells were stimulated with drifting sine-wave gratings that varied in spatial frequency and contrast. Among 71 LGN neurons that were studied, 53 showed a statistically significant change in response during SC inactivation. Control experiments with mock injections indicated that some changes could be attributed to slow waxing and waning of responsiveness over time. However, this could not account for all of the effects of SC inactivation that were observed. Forty cells showed changes that were attributed to the removal of tecto-geniculate influences. About equal numbers of cells showed increases (22 cells) and decreases (18 cells) in some aspect of their response to visual stimuli during SC inactivation. The proportion of cells that showed tecto-geniculate influences was somewhat higher in the C layers (68% of the cells) than in the A layers (44% of the cells). In addition, among cells that showed a significant change in maximal response to visual stimulation, the change was larger for cells in the C layers (64% average change) than in the A layers (26% average change) and it was larger for W cells (61% average change) than for X and Y cells (29% average change). Nearly all of the X cells that showed changes had an increase in response, and nearly all of the Y cells had a decrease in response. In addition, across all cell classes, 80% of the cells with receptive fields < 15 deg from the area centralis had an increase in response, and 80% of the cells with receptive fields > 15 deg from the area centralis had a decrease in response. None of the LGN cells had significant changes in spatial resolution, and only three cells had changes in optimal spatial frequency. Ten cells had a change in contrast threshold, 25 cells had a change in contrast gain, and 29 cells had a change in the maximal response to a high-contrast stimulus. Thus, our results suggest that the tecto-geniculate pathway has little or no effect on spatial processing by LGN neurons. Rather, the major influence is on maximal response levels and the relationship between response and stimulus contrast. Several hypotheses about the role of the tecto-geniculate pathway in visual behavior are considered.

Keywords

Dorsal lateral geniculateSuperior colliculusX cellY cellW cellTecto-geniculate influenceSpatial frequencyContrast
Type
Research Articles
Information
Visual Neuroscience , Volume 11 , Issue 6 , November 1994 , pp. 1059 - 1076
Copyright
Copyright © Cambridge University Press 1994

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