Abstract

Summary Rat Ss were tested for positive and negative contrast effects with the use of a 2 × 2 design (six or one 45-mg. pellet as reward in pre- or postshift phase) and with the use of the necesssary methodological controls. Eighty Ss were run in a straight alley for 33 pre- and 10 postshift trials. A significant (p < .01) negative contrast effect (NCE) was found, but there was no evidence of a positive contrast effect (PCE). It was concluded that the NCE is a viable behavioral phenomenon, whereas the PCE is questionable.

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