A non-modality specific impairment in spatial learning after fornix lesions in monkeys

Abstract

The present study compared the performance of monkeys with formix or partial hippocampal lesions on spatial and object reversals in the tactile modality. Performance of operated and normal control monkeys on the spatial reversal task in the tactile modality was also contrasted with that in the visual modality. Finally, we assessed some long-term effects of fornix sections. The selective spatial deficit after fornix lesions was found to be independent of sensory modality. However, operated monkeys were more impaired in the tactile modality, and the effects of fornix sections on spatial reversal learning were found to be relatively transient.