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Acquisition of conditioned inhibition in rats is impaired by ablation of serotoninergic pathways

Lister, S., Pearce, John M., Butcher, S. P., Collard, K. J. and Foster, G. A. 1996. Acquisition of conditioned inhibition in rats is impaired by ablation of serotoninergic pathways. European Journal of Neuroscience 8 (2) , pp. 415-423. 10.1111/j.1460-9568.1996.tb01224.x

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The effects of chronically ablating the serotoninergic inputs to various regions of the rat brain on the ability to solve a feature-negative discrimination was measured. After intracerebroventricular administration of the specific neurotoxin 5, 7-dihydroxytryptamine, the rats exhibited an impaired capacity to solve such a discrimination, irrespective of whether auditory or visual stimuli were used. Further behavioural analysis revealed that this effect was not due to a reduced capacity to form excitatory associations, since both groups responded equally to reinforced stimuli. By contrast, the lesion more likely resulted in a failure to endow the non-reinforced stimuli with inhibitory properties. This suggestion was supported by the observation that, in a retardation test, the conditioned inhibitor aroused less inhibition in the lesioned group than in vehicle-injected controls. Furthermore, the conditioned inhibitor failed to pass a summation test in lesioned animals, again indicating that their hampered ability to master the discrimination was the result of an impairment in the formation of inhibitory associations. It is concluded that destruction of central 5-hydroxytryptamine-containing pathways impairs the functioning of brain areas underlying inhibitory associative learning.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Uncontrolled Keywords: rat; 5, 7-dihydroxytryptamine; behavioural inhibition; memory dysfunction
Publisher: Wiley-Blackwell
ISSN: 0953-816X
Last Modified: 04 Jun 2017 04:12

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