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Neuroreport. 2001 Sep 17;12(13):2927-33.

Convergence of Y and non-Y channels onto single neurons in the superior colliculi of the cat.

Author information

1
Institute for Biomedical Research, University of Sydney, NSW 2006, Australia.

Abstract

Receptive field properties of single neurons in the cat superior colliculus were examined following selective conduction-block of Y-type fibers in contralateral optic nerve. Although the responses evoked by photic stimuli presented via the Y-blocked eye were significantly weaker than those evoked by stimuli presented via the normal eye, > 85% of collicular cells were binocular. Furthermore, when binocular cells were stimulated via the Y-blocked eye their median upper cut-off velocity (100 degrees /s) was significantly lower than that (400 degrees /s) for stimuli presented via the normal eye. Thus, there is a substantial degree of excitatory convergence of Y- and non-Y- information channels on single collicular neurons and the responses to high velocity of motion appear to depend on the integrity of Y-type input.

PMID:
11588605
[Indexed for MEDLINE]

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