Abstract
The aim of the present study was to evaluate the effects of chronic and acute treatment by the Gingko biloba extract, EGb 761 (IPSEN, France) on olfactory short-term memory in rats, using a spontaneous recognition procedure. The effects of a daily EGb 761 treatment (30 or 60 mg/kg) over a period of 30 days (Experiment 1) were evaluated in young male rats. Those of a single injection of EGb 761 were assessed either in young male rats at 60 or 120 mg/kg (Experiment 2) or in aged female rats at 60 mg/kg (Experiment 3). Results showed that, at the highest dose (60 mg/kg), chronic EGb 761 treatment enhanced the recognition performances, allowing recognition at delays at which control animals did not show any recognition. Acute treatment enhanced recognition at both doses tested. The results of the third experiment showed that EGb 761 had an overall enhancement effect on the performances of aged rats. In summary, our results provide evidence for a short-term memory enhancement effect of EGb 761 in both young and aged rats.
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