EFFECTS OF SUB-CORTICAL ELECTROLYTIC LESIONS ON THE HEAD-EYE TURNING RESPONSE INDUCED BY ELECTRICAL-STIMULATION OF THE CATS PULVINAR-LATERALIS POSTERIOR NUCLEUS COMPLEX

  • 1 January 1982
    • journal article
    • research article
    • Vol. 120  (4) , 397-410
Abstract
The relations between 3 subcortical structures and P-LP [pulvinar-lateralis posterior], all capable of inducing contralateral head-eye turning responses when electrically stimulated, were studied in 3 groups of cats. In all the experiments, stainless steel electrodes were chronically implanted in P-LP and in each group of 5 cats. Electrodes were also placed in the caudate nucleus, superior colliculus and nucleus centralis lateralis. Series of current intensity threshold values for evoking head-eye turning responses were determined in each group, before and after electrolytic lesion of these 3 subcortical structures. The total observation period was .apprx. 30 days. Only the destruction of the superior colliculus produced the loss of the ability of the ipsilateral P-LP to evoke turning response. The efferent pathway that carries the information for turning response from P-LP evidently runs through the ipsilateral superior colliculus.