Amount of primary reward and strength of secondary reward.

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Abstract
The relationship between strength of secondary reward and amount of primary reward with which the stimuli had been associated was studied in rats by 2 methods. In Expt. 1, secondary-reward strength was measured by the effect of such stimuli on resistance to extinction of a simple running response. Groups receiving secondary reward differed significantly from groups not receiving secondary-reward cues, but the former groups did not differ significantly in resistance to extinction when cues were associated with 120 mg. or 30 mg. food reward. In Expt. 2, secondary-reward strength was measured by (a) number of turns to the non-preferred, secondary-reward side in a U-maze, and (b) running times in this apparatus. No differences between high and low primary reward groups were found in number of turns. Low-reward subjects showed significantly lower median running times from the choice point to the secondary-reward end box, but no other running times differed significantly.
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