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Effects of the lateral septum and latent inhibition on successive discrimination learning

✍ Scribed by Arthur W. Toga; Howard A. Burton

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
689 KB
Volume
4
Category
Article
ISSN
0360-4012

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✦ Synopsis

Damage to the lateral nucleus of the septum in the rat resulted in atypical learning to a previously meaningless stimulus. Nonreinforced preexposure t o a stimulus normally makes more difficult subsequent use of that stimulus for learning. The effect of this preexposure on learning is termed latent inhibition and was demonstrated in sham operated animals. Rats in which the lateral septum was damaged demonstrated a paradoxically smaller learning deficit in the presence of a conditioned stimulus that was previously presented without reinforcement, when compared to the performance of both septal lesioned rats not receiving nonreinforced preexposure and sham operates receiving preexposure. The interaction of nonreinforced preexposure and lateral septal lesions can be explained using a proposed sensitization hypothesis.

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