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Pyrithiamine-induced thiamine deficiency (PTD) in rats is used to model the etiology, diencephalic neuropathology, and memory deficits of Korsakoff's amnesia. We assessed the performance of rats exposed to PTD on a test of object recognition--nonrecurring-items delayed nonmatching-to-sample (DNMS). PTD produced thalamic lesions similar to those of Korsakoff's amnesics and similar to those previously observed in PTD rats. PTD rats required more trials to master DNMS at a 4-s retention delay than did controls, and after they had done so, they performed more poorly than controls at delays of 15, 30, 60, and 120 s. DNMS deficits were also observed in PTD rats that received training prior to PTD treatment. These findings support the validity of the PTD rat model of Korsakoff's disease by demonstrating that PTD rats display object-recognition deficits that are similar to those reported in Korsakoff amnesics.
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