Spatial disparity coding in the superior colliculus of the cat

Experimental Brain Research
B A BaconJ P Guillemot

Abstract

Cells in the superficial layers of the superior colliculus of the cat have mainly binocular receptive fields. The aim of the present experiment was to investigate the sensitivity of these cells to horizontal spatial disparity. Unit recordings were carried out in the superficial layers of the superior colliculus of paralyzed and anesthetized cats. Centrally located receptive fields were mapped, separated using prisms, and then stimulated simultaneously using two luminous bars optimally adjusted to the size of the excitatory region of the receptive fields. Only binocular cells were tested, and 65% of these units were found to be sensitive to spatial disparities. Some cells (20%) were clearly insensitive to spatial disparity and the remaining 15% showed complex, unclassifiable interactions. The sensitive cells could be divided into four classes based on their disparity-sensitivity profiles: 38% showed excitatory interactions, whereas 9% showed inhibitory interactions. Moreover, 11% and 7% of the cells responded, respectively, to crossed or uncrossed disparities, and were classified as near cells and far cells. Whereas the general shapes of the sensitivity profiles were similar to those of cells in areas 17-18, selectivity in the s...Continue Reading

Citations

Feb 26, 2000·Trends in Cognitive Sciences·G C DeAngelis
Apr 5, 2008·Neural Computation·Eric K C Tsang, Bertram E Shi
May 6, 2004·Brain Research·Daniel MimeaultJean-Paul Guillemot
Aug 9, 2003·Journal of Neurophysiology·Mark M G Walton, Lawrence E Mays
May 13, 1999·Journal of Neurophysiology·V Chaturvedi, J A van Gisbergen
Jun 30, 2001·Brain Research·B A BaconJ P Guillemot

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