Ninety lower-middle and upper-lower class fourth-grade students of high, medium, and low intelligence were divided into three verbal incentive treatment groups—praise, reproof, and no incentive. Each group was given two trials on a discrimination task, the incentive treatment being applied between trials. The major hypothesis, that there is an interaction between effectiveness of incentive and intelligence, was supported in previous research on high school juniors. But for these fourth graders, although the trend was in the predicted direction, there was no significant relationship between intelligence and effectiveness of verbal incentive. There was a significant difference for this age child, however, between the main effects, with praise being more effective than reproof or no incentive.
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