The septo-hippocampal system and cognitive mapping. 1982

J N Rawlins, and D S Olton

Rats were trained on a rewarded alternation task, run as a spatial working memory task on an elevated T-maze. Experiment 1 tested the effects of fornix-fimbria (FOFI) lesions on the acquisition, and of medial septal (MS) lesions on the acquisition and retention of this task, when the rats had to use information provided by being forced to run to a selected goal arm. The FOFI lesion produced an enduring impairment; the MS rats showed a severe impairment initially, but subsequently showed some behavioural recovery, when tested in acquisition or in retention. Experiment 2 similarly tested the effects of lateral septal (LS) lesions on acquisition of the task, and found an impairment which again showed signs of recovery with further testing. Experiment 3 was a transfer test conducted on the rats which had shown recovery in Experiments 1 and 2. The rats were now forced to use information provided by simply being placed on a selected goal arm. Both control animals and lesion animals showed identical choice accuracy, lower than that seen in Experiments 1 and 2. Experiment 4 tested acquisition of the task used in Experiment 3, and acquisition of a task in which the rat had to use information provided by running to the goal arm via a different route. Control rats again performed poorly, and scarcely differed from MS rats. It was concluded that rats have difficulty in using information about 'places', and that controls and lesion rats learn the tasks in the same way. The implications for 'cognitive mapping' hypotheses are discussed.

UI MeSH Term Description Entries
D008297 Male Males
D009434 Neural Pathways Neural tracts connecting one part of the nervous system with another. Neural Interconnections,Interconnection, Neural,Interconnections, Neural,Neural Interconnection,Neural Pathway,Pathway, Neural,Pathways, Neural
D009474 Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM. Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D009949 Orientation Awareness of oneself in relation to time, place and person. Cognitive Orientation,Mental Orientation,Psychological Orientation,Cognitive Orientations,Mental Orientations,Orientation, Cognitive,Orientation, Mental,Orientation, Psychological,Orientations,Orientations, Cognitive,Orientations, Mental,Orientations, Psychological,Psychological Orientations
D011919 Rats, Inbred Strains Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding. August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D012153 Retention, Psychology The persistence to perform a learned behavior (facts or experiences) after an interval has elapsed in which there has been no performance or practice of the behavior. Psychological Retention,Retention (Psychology),Psychology Retention,Retention, Psychological
D001931 Brain Mapping Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures. Brain Electrical Activity Mapping,Functional Cerebral Localization,Topographic Brain Mapping,Brain Mapping, Topographic,Functional Cerebral Localizations,Mapping, Brain,Mapping, Topographic Brain
D002755 Choice Behavior The act of making a selection among two or more alternatives, usually after a period of deliberation. Approach Behavior,Approach Behaviors,Behavior, Approach,Behavior, Choice,Behaviors, Approach,Behaviors, Choice,Choice Behaviors
D003071 Cognition Intellectual or mental process whereby an organism obtains knowledge. Cognitive Function,Cognitions,Cognitive Functions,Function, Cognitive,Functions, Cognitive
D003216 Conditioning, Operant Learning situations in which the sequence responses of the subject are instrumental in producing reinforcement. When the correct response occurs, which involves the selection from among a repertoire of responses, the subject is immediately reinforced. Instrumental Learning,Learning, Instrumental,Operant Conditioning,Conditionings, Operant,Instrumental Learnings,Learnings, Instrumental,Operant Conditionings

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