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CONFLICT RESOLUTION BY SEPTAL, DORSAL HIPPOCAMPAL OR VENTRAL HIPPOCAMPAL LESIONED RATS WITH PRE‐ OR POST‐OPERATIVE APPROACH TRAINING
Author(s) -
FRIED P. A.
Publication year - 1972
Publication title -
british journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.536
H-Index - 92
eISSN - 2044-8295
pISSN - 0007-1269
DOI - 10.1111/j.2044-8295.1972.tb01290.x
Subject(s) - hippocampal formation , dorsum , psychology , neuroscience , shock (circulatory) , anatomy , medicine
Rats with septal, dorsal hippocampal or ventral hippocampal lesions were observed during the development of approach behaviour followed by the introduction of an approach‐avoidance (food—shock) conflict which was eventually resolved in favour of approach. Surgery was performed either prior to or after the acquisition of the initial approach response. Septal lesions made before approach training resulted in a loss of inhibition during the early stages of conflict, whereas lesions made just prior to the conflict resulted in increased inhibition. Irrespective of the timing of surgery, rats with dorsal hippocampal lesions demonstrated ‘normal’ avoidance behaviour on the trials immediately after shock, but overcame the fear sooner than the control subjects. Ventral hippocampal lesions produced less avoidance behaviour when made before approach training than when made just prior to the conflict. Possible functions of the various structures are discussed.