ROLE OF THE POSTERIOR COLLICULI IN FORMATION OF CONDITIONED REFLEXES TO AMPLITUDE-MODULATED STIMULI IN RATS

  • 1 January 1981
    • journal article
    • research article
    • Vol. 31  (3) , 557-563
Abstract
After a bilateral ablation of the rat auditory cortex, differentiation of a tonal signal from an amplitude-modulated stimulus with a 50 c/s [cycle/s] modulation frequency is preserved, while ablation of the posterior colliculi completely abolishes differentiation of these signals, without subsequent restoration 6 mo. after the operation. The same rats are able to elaborate a differentiation of a tonal signal from an amplitude-modulated signal with a 500 c/s modulation frequency. The posterior colliculi are the level of the auditory system where the coding of signals with a modulation frequency of 50 c/s amplitude is accomplished, whereas stimuli with a higher frequency of amplitude modulation are coded at a lower level of the auditory system.

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