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  • Title: Convergence of Y and non-Y channels onto single neurons in the superior colliculi of the cat.
    Author: Wang C, Waleszczyk WJ, Benedek G, Burke W, Dreher B.
    Journal: Neuroreport; 2001 Sep 17; 12(13):2927-33. PubMed ID: 11588605.
    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.
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