The effects of shifts in magnitude of reward on runway performance in immature and adult rats

Abstract

Three groups of immature rats and three groups of adult rats were each trained for 20 preshift trials with a different quantity of reward: .1, .5, or 2.5 gm of wet mash. On 25 post-shift trials, each group was rewarded with .5 gm. In preshift training, amount of reward significantly differentiated immature groups but not adult groups. On postshift trials, how ever, reward values significantly differentiated adult groups but not immature groups.