Naive rats given intraperitoneal injections of an extract prepared from the brains of either trained or untrained donor rats learned a position discrimination task in simple parallel alley runways significantly faster than original (uninjected) donor rats. Specific interanimal transfer, however, was not demonstrated as there was no statistically reliable difference between recipients of “trained brain” vs “untrained brain” extracts.
Position discrimination learning by common marmosets in the WGTA
