Effects of Medial and Lateral Septal Lesions on the Partial Reinforcement Extinction Effect at One Trial a Day

SAGE Publications - Tập 31 Số 4 - Trang 653-674 - 1979
Joram Feldon1, J.A. Gray1
1Department of Experimental Psychology, University of Oxford South Parks Road, Oxford, OX1 3UD

Tóm tắt

Rats sustained electrolytic lesions of either the medial septal (MS) area (of a kind known to eliminate the hippocampal theta rhythm) or the dorso-lateral septal (LS) area (of a kind known to spare theta) or both (a “total septal”, TS, lesion). They were compared to sham-operated controls in three experiments in the straight alley with food reward on continuous (CRF) or partial (PRF) reinforcement at one trial a day. MS lesions either left the partial reinforcement extinction effect (PREE) unchanged or enhanced it; LS lesions substantially reduced the PREE. The latter effect was due to a fall in resistance to extinction in PRF animals with no change in CRF animals. MS lesions greatly increased resistance to extinction in both CRF and PRF animals in one experiment but increased resistance to extinction only marginally and only in PRF animals in a second experiment. The TS lesion acted like the LS lesion. These results demonstrate a clear double dissociation between the effects of MS and LS lesions, especially in the PRF condition (LS lesions reduce resistance to extinction, MS lesions increase it).

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Tài liệu tham khảo

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SAGE Publications

Tập 31 Số 4

653-674

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