Acquisition and waning of exposure–induced attraction to a nonnatural odor in rat pups

The present experiments examine acquisition and waning of exposure-induced attraction to a nonnatural odor in rat pups. I found that (1) acquisition of attraction induced by experience of an odor associated with the mother (M-E) and of attraction induced by experience of an odor in the general environment (S-E) had similar time courses and were of similar magnitude in pups less than 20 days of age; (2) waning of S-E-induced attraction to a …