Abstract：
:The effects of microinjection of alpha-noradrenergic agonists and antagonists in the flocculus on the basic gain and adaptibility of vestibulo-ocular and optokinetic responses were investigated. A complementary, previous investigation had shown that the adaptation, but not the basic performance, of compensatory oculomotor responses were markedly influenced by beta-noradrenergic mechanisms in the flocculus. In contrast, the present experiments with bilateral, intrafloccular injections of phenylephrine, prazosin, clonidine and idazoxan failed to reveal any effect of alpha 1- or alpha 2-noradrenergic mechanisms on either basic performance or adaptation of compensatory eye movements. Intravenous administration of clonidine, however, reduced the gain of the optokinetic and vestibulo-ocular responses by about 70 and 50%, respectively, at dosages of 0.07 mg/kg. Recovery from this effect took about 1.5 h. A higher dosage of clonidine (0.7 mg/kg) had a similar, but longer lasting effect, and also markedly increased the frequency of spontaneous saccades. Intravenous administration of phenylephrine did not affect the oculomotor responses. It is concluded that the control of oculomotor responses is not susceptible to alpha-noradrenergic influences at the level of the flocculus, but that alpha 2-agonistic action inhibits these responses through an extra-floccular structure.
journal_name
Brain Resjournal_title
Brain researchauthors
Tan HS,van Neerven J,Collewijn H,Pompeiano Odoi
10.1016/0006-8993(91)90623-4subject
Has Abstractpub_date
1991-10-25 00:00:00pages
207-15issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(91)90623-4journal_volume
562pub_type
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