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  • Title: Impaired allocentric spatial working memory and intact retrograde memory after thalamic damage caused by thiamine deficiency in rats.
    Author: Mumby DG, Cameli L, Glenn MJ.
    Journal: Behav Neurosci; 1999 Feb; 113(1):42-50. PubMed ID: 10197905.
    Abstract:
    Rats were tested on an allocentric-spatial working-memory task--delayed matching-to-place (DMTP) in a water maze--before and after either pyrithiamine-induced thiamine deficiency (PTD) or electrolytic lesions of the lateral internal medullary laminae (IML), an area damaged by PTD. DMTP trials consisted of paired swims, with the escape platform in a new location on each trial. PTD rats were impaired at retention delays of 300 s, but not at delays of 4 or 60 s. Rats with IML lesions performed normally at all delays. Both groups displayed normal retention of object-discrimination problems that they had learned at different intervals before treatment (5 weeks, 3 weeks, and 1 week). The results suggest that PTD causes delay-dependent deficits of allocentric spatial working memory and that damage outside the IML is probably responsible. Neither PTD-induced diencephalic damage nor restricted IML lesions appear to produce a global retrograde amnesia.
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