Role of the nucleus of the optic tract of monkeys in optokinetic nystagmus and optokinetic after-nystagmus

Brain Research
I KatoT Ikarashi

Abstract

A previous experiment disclosed that unilateral lesions of the nucleus of the optic tract (NOT) in the fascicularis monkey resulted in selective loss of optokinetic nystagmus (OKN) towards the lesioned side. This may suggest that the NOT in monkeys, as in non-primates, represents the first relay station in the basic horizontal optokinetic path. This monkey, however, did not show a rapid rise in OKN velocity in response to steps in stimulus velocity. In the present experiments, effects of NOT lesions upon both the rapid and the slow rise of OKN as well as optokinetic after-nystagmus (OKAN) were examined in 6 fuscata monkeys. In 3 with total NOT lesions of 6 monkeys, none of the slow rise OKN or OKAN slow phase velocity were produced towards the lesioned side. In one of the remaining 3 monkeys with partial NOT lesions, a slow rise OKN and OKAN slow phase velocity were selectively reduced towards the lesioned side. In 2 of these 4 monkeys whose lesions were localized in the lateral portions of the pretectum, rapid rise in OKN velocity remained unchanged, whereas in the remaining two whose lesions were large enough to extend into the medial portions of the pretectum near the nucleus of the posterior commissure, rapid rise in OKN ve...Continue Reading

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