Involvement of the cholinergic mechanism in depression of the caudate spindle

Abstract
Involvement of the cholinergic and catecholaminergic mechanisms in the caudate spindle recorded from the anterior and posterior sigmoid gyri was studied in cats. Physostigmine (0.01-0.1 mg/kg i.v.) abolished the appearance of the caudate spindle. The inhibitory effects were antagonized by the administration of atropine (0.25-1 mg/kg i.v.). The caudate spindle was inhibited by high frequency stimulation of the mesencephalic reticular formation. This effect was antagonized by atropine; L-dopa (25-50 mg/kg i.v.), L-dopa + MAO [monoamine oxidase] inhibitor and methamphetamine (0.5-5 mg/kg i.v.) did not influence the caudate spindle. Apparently a cholinergic mechanism is involved in caudate spindle depression.

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