Abstract
Disrupting circadian organization by exposing rats to a shifted illumination schedule after training for passive avoidance and shuttle box avoidance behavior resulted in retrograde amnesia as evidenced by impaired performance during retention and extinction testing respectively. A single treatment with either the ACTH-(4–9) analog ORG 2766 or desglycinamide 9-(Arg 8)-vasopressin (DGAVP) 1 hour prior to the retention of passive avoidance or extinction of shuttle box avoidance behavior restored the behavioral impairment. It is suggested that these peptides may be useful to relieve memory deficits induced by disturbances in circadian organization.
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