Chicks were first imprinted on one stimulus and then given equivalent training on a second stimulus. Preference tests were given either 0 or 24 hr. later. All were re-tested 96 hr. later. The 24 hr. group displayed a significant preference for the object on which they were first imprinted (primacy effect), which persisted to the 96 hr. re-test. The 0 hr. group displayed neither a primacy nor a recency effect on either test. The results provide little support for the view that imprinting differs from other forms of conditioning.