Discrimination of rewards as a function of contrast in reward stimuli.

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Abstract
104 Ss (subjects) were given a . 006-cc drop of a 10 gm/l saccharine solution every 11th lick from a drinking tube. On the intervening 10 licks, Ss received nothing, or they received fluids that varied on 2 dimensions saccharine concentration and volume. The results show that decreasing the concentration of the fluid delivered on the 10 intervening responses significantly increased resistance to extinction. The volume variable had no significant effect on either licking rate during training or on resistance to extinction. The relevance of the findings to the effect of magnitude of reward on resistance to extinction after training with partial reinforcement was discussed.

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