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Orienting bias in the rat produced by hippocampal lesion

Authors
Journal
Behavioral Biology
0091-6773
Publisher
Elsevier
Publication Date
Volume
11
Issue
3
Identifiers
DOI: 10.1016/s0091-6773(74)90599-9

Abstract

A recent view of hippocampal function is that it acts as an attentional gating device, a theory which relies heavily on the inability of hippocampally lesioned animals to orient normally. The results of the first experiment are consistent with the attentional theory: unilateral lesions of the hippocampus produce ipsilateral orienting to symmetrically presented stimuli. However, a second experiment shows that the direction of orienting bias to a visual stimulus is not altered by cutting the optic chiasm, a procedure which functionally reverses visual influence to lesioned and intact hemispheres. Since the direction of bias produced by unilateral hippocampal lesion is unchanged by this reversal of sensory input, it seems likely that the orienting bias is due to a motor rather than a sensory impairment.

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