IMPRINTING - PRE- AND POSTTRIAL ADMINISTRATION OF PENTOBARBITAL AND APPROACH RESPONSE

Investigated the effect of pentobarbital on the development and retention of the approach response in 144 White-Rock Cornish laboratory-hatched chicks. In Exp. I, the strength of approach varied inversely with the amount of drug (D) administered immediately prior to training trials. However, on a Day 4 retention test, performance was not affected by removal of the D from those Ss trained under D, or by the introduction of low and medium doses of D for those Ss trained without D. In Exp. II, it was found that the heavy D dose which was administered intracardially immediately after each trial produced training deficits intermediate to those found with medium and heavy D in Exp. I. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.