60 Ss were randomly and equally divided into three groups (2 experimental, 1 control) to investigate the effect of lack of feedback on sequential temporal estimates. The production method was employed, as was a “filling” task designed to be cognitively related to Ss' future expectations. As predicted, systematic changes occurred across trials for all groups, independent of differential expectations. These results were related to “judgment drift” and to the nature of the interpolated filling activity.
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