Positive Contrast in the Runway Obtained with Delay of Reward

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Science  09 May 1969:
Vol. 164, Issue 3880, pp. 724-725
DOI: 10.1126/science.164.3880.724


The failure to find positive contrast effects in the runway may be attributed to a ceiling effect that can be overcome with the use of delay of reward. Rats were trained one trial a day in a runway with small, medium, or large reward. When a shift to large reward was combined with delay of reward, shift groups slowed down less than controls.

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