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Titolo:
Rats' processing of visual scenes: effects of lesions to fornix, anterior thalamus, mamillary nuclei or the retrohippocampal region
Autore:
Gaffan, EA; Bannerman, DM; Warburton, EC; Aggleton, JP;
Indirizzi:
Univ Reading, Dept Psychol, Reading RG6 6AL, Berks, England Univ Reading Reading Berks England RG6 6AL eading RG6 6AL, Berks, England Univ Oxford, Dept Expt Psychol, Oxford OX1 3UD, England Univ Oxford Oxford England OX1 3UD Expt Psychol, Oxford OX1 3UD, England Univ Bristol, Sch Med Sci, Dept Anat, Bristol BS8 1TD, Avon, England Univ Bristol Bristol Avon England BS8 1TD Bristol BS8 1TD, Avon, England Cardiff Univ, Sch Psychol, Cardiff CF10 3YG, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3YG ardiff CF10 3YG, S Glam, Wales
Titolo Testata:
BEHAVIOURAL BRAIN RESEARCH
fascicolo: 1-2, volume: 121, anno: 2001,
pagine: 103 - 117
SICI:
0166-4328(200106)121:1-2<103:RPOVSE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENTORHINAL CORTEX LESIONS; IN-PLACE MEMORY; MEDIAL SEPTAL-LESIONS; MORRIS WATER MAZE; PERIRHINAL CORTEX; SPATIAL MEMORY; HIPPOCAMPAL CONNECTIONS; NEUROTOXIC LESIONS; LATENT INHIBITION; MAMMILLARY REGION;
Keywords:
anterior thalamus; attention; entorhinal cortex; fornix; hippocampus; mamillary bodies; rat; scene processing; subiculum; visual learning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Gaffan, EA Univ Reading, Dept Psychol, Reading RG6 6AL, Berks, England Univ Reading Reading Berks England RG6 6AL 6AL, Berks, England
Citazione:
E.A. Gaffan et al., "Rats' processing of visual scenes: effects of lesions to fornix, anterior thalamus, mamillary nuclei or the retrohippocampal region", BEH BRA RES, 121(1-2), 2001, pp. 103-117

Abstract

We analysed the effects of lesions of hippocampal-diencephalic projections- fornix (FX) mamillary bodies (MB) and anterior thalamic nuclei (AT) - and retrohippocampal (RH) lesions including entorhinal cortex and ventral subiculum, upon scene processing. All lesions except FS were neurotoxic. Rats learned to discriminate among computer-generated visual displays ("scenes")each comprising three different shapes ("objects"). The paradigm was constant-negative: one constant scene (unrewarded) appeared on every trial together with a trial-unique variable scene (rewarded). Four types of variable scene were intermingled: (1) unfamiliar objects in different positions from those of the constant (type O + P), (2) unfamiliar objects in same positions as in the constant (type O), (3) same objects as the constant in different positions (type P), (4) same objects and positions as the constant but recombined (type X). Group RH performed like controls while groups FX, AT andMB showed (surprisingly) enhanced performance on types X and O. One explanation is that normal rats attempt to process all objects in a scene concurrently, while hippocampal-projection lesions disrupt this tendency, producing a narrower attention, which paradoxically aids performance with some variable types. The results confirm that the entorhinal cortex has a different function from other components of the hippocampal system. (C) 2001 ElsevierScience B.V. All rights reserved.

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Documento generato il 19/01/20 alle ore 05:58:44