[Topical organization of the cat inferior colliculus under conditions of the simulated sound source motion].
Binaurally presented click trains with gradually changing ITDs were used to imitate the sound source motion. Focal EP-trains from the cat inferior colliculus, IC, were recorded, and changing amplitude of the successive EPs following successive clicks was taken for estimation of the motion effect (ME). It was shown that a) in 25% of cases the ME depends on the motion direction; b) the ME is better presented ipsilaterally in respect to the recording point, with equal dependence on motion velocity both on the left and on the right; c) the ME phenomenon is connected with prevalence of contralateral afferentation as compared to the ipsilateral one; d) the ME is connected with inhibitory phenomena such as binaural suppression of monaural afferentation; e) the ME of the best amplitude is most pronounced in the ventrolateral area of the IC central nucleus, its localisation being near to that of the great multipolar neurones, whereas slightly and moderately pronounced MEs are presented rather uniformly over the central nucleus like the "basic" neurones are; MEs of different pronouncement are supposed to depend differently on effectiveness of ipsi- and contralateral stimulation--in accordance with properties of multipolar and "basic" neurons.
Radionova
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EA
I. P. Pavlov Institute of Physiology of the Russian Acad. Sci., St. Petersburg, Russia.
D000161:Acoustic Stimulation; D000818:Animals; D002415:Cats; D005072:Evoked Potentials, Auditory; D007245:Inferior Colliculi / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D013017:Sound Localization / Q000502:physiology*