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In two experiments in a Morris pool rats were trained with a successive discrimination procedure in the presence of two objects or landmarks. The angular separation between the two landmarks signalled either the presence (0 degrees, S+ trials) or the absence (90 degrees, S- trials) of the platform. After training the rats received unrewarded test trials in which one of the landmarks was presented at a range of places in relation to the second landmark. The generalization gradient obtained in Experiment 1 showed higher responding on the side of S+ away from S-. This effect has been called area shift. In Experiment 2, with a slightly different discrimination training, a moderate peak shift effect was obtained. The present experiments show for the first time area and peak shift effects with rats across spatial locations when working with a navigation task.
