Abstract
White Plymouth Rock chickens, bidirectionally selected for weight, were trained to keypeck for water. No between-line differences in rate of acquisition or asymptotic level of performance were apparent. Subjects from both weight lines were then assigned to either a forward- or backward-conditioning group, with a white noise CS and a shock UCS. No line or conditioning group showed unconditioned suppression. Forward-conditioning groups of both lines showed significantly more conditioned suppression than backward-conditioning groups. Furthermore, the high-weight subjects from both conditioning groups suppressed more than their low-weight counterparts in the presence of the CS.
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