Histological and electrophysiological studied of the frog thalamus localized more precisely the Bellonci and the posteriorthalamic nuclei in the diencephalon. Responses of the thalamic neurons have been characterized as well as the specifics of their receptive fields as compared with the tectum neurons. Large heterogeneous receptive fields with prevailing excitatory response were shown to predominate in the frog diencephalon.
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