Abstract
In Experiment 1, three groups of rats were given 60 runway acquisition trials (6/day) to either one 500-mg pellet (Group 1L), 25 20-mg pellets (Group 25S), or one 20-mg pellet (Group IS). Rate of approach to asymptote was faster for Group 25S than for Group 1L, and at asymptote, they ran faster than Group IS. All groups then received one 20-mg pellet for 30 trials. Group 25S showed a greater depression effect than did Group 1L. The acquisition results were replicated in Experiment 2, and, during a third phase in which Ss were given hurdle-jump training, both shifted groups jumped faster than Group IS, but Group 25S jumped the fastest. It was concluded that greater amounts of frustration are elicited when both reward magnitude and number of pellets are reduced than when only reward magnitude is reduced.
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