Multimodal sensory neglect in rats with radical unilateral posterior isocortical and superior collicular ablations.

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Abstract
In a study with 22 male Long-Evans hooded rats, unilateral posterior decortication resulted in contralateral visual neglect. However, when this lesion was combined with a simultaneous contralateral mid-brain tectal lesion, visual neglect ipsilateral to the cortical ablation and visual responsiveness contralateral to the posterior decortication occurred. Results confirm J. M. Sprague and T. H. Meikle's (1965) findings with cats. Contralateral multimodal sensory neglect followed unilateral superior colliculectomy and was completely independent of the laterality of a simultaneous unilateral posterior decortication. The ipsiversive circling which followed large unilateral tectal lesions may have a sensory basis. Findings are consistent with other recent outcomes which suggest that functions of the optic tectum are broader than has been implied by its classical characterization as a visual integrative mechanism. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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