[Reaction of caudate nucleus neurons to acoustic stimulation during functional exclusion of the medial geniculate body].

In chronic experiments, responses of the cat caudate nucleus neurons to sound clicks (0.2/s) were recorded extracellularly under conditions of functional blockade of the medial geniculate body (MGB). Analysis of the average poststimulus histograms showed that, under anodic polarization of the parvo- and magnocellular parts of the MGB, 39% of the caudate nucleus neurons responded to sound signals by a decrease of phasic activation and 30% of neurons--by its disappearance, 9%--by lengthening of latency of the responses. In some units the anodic polarization of the MGB magnocellular part induced an increase in phasic activation. Stimulation of the MGB exerted a facilitating effect on the unit responses of the caudate nucleus to clicks.