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At least 163 records · Page 9Linked to original sources
PubMed1985

Is cholinergic activity of the caudate nucleus involved in memory?

A review was made of experiments dealing with the involvement of cholinergic activity of the caudate nucleus in memory processes. Injections of acetylcholine-receptor blockers or of neurotoxins against cholinergic interneurons into the striatum produce marked impairments in acquisition and retention of instrumental tasks while injections of acetylcholine or choline into the caudate produce the opposite effect. However, after a period of overtraining cholinergic blockade or interference with neural activity of the caudate does not produce significant deficits in retention. It is concluded that striatal cholinergic activity is critically involved in memory of recent events and that long-term memory is mediated by different neurochemical systems outside the caudate nucleus.

Animals↗
PubMed1980

Sequential auditory and visual discriminations after temporal lobe ablation in monkeys.

Studies in the monkey have shown that cortex outside of the primary projection areas in the superior temporal gyrus and in the inferotemporal region in important for the execution of some auditory and visual descriminations. In this study, six monkeys were trained to perform four auditory and two visual discriminations. Retention tests were given prior to bilateral removal of the anterior part of the lateral surface of the superior temporal gyrus, the inferotemporal region, or both areas together. Superior temporal ablations elicited severe deficits on some auditory discriminations. Inferotemporal ablations caused little or no impairment on visual discriminations. This negative finding is attributed to the sequential rather than spatial mode of presentation of visual stimuli, and to overtraining. A single monkey trained on a spatial visual pattern problem without overtraining was impaired. Another monkey tranied to perform an auditory reverse intensity discrimination exhibited a deficit in ability to perform the problem after removal of auditory cortex within the lateral fissure.

Animals↗