3- to 4- and 7- to 8-yr.-old children were given a series of 6-trial discrimination problems involving 2 objects after receiving either a rewarded or nonrewarded single-object information trial. During the discrimination, 2 other variables were investigated, fixed vs varying formboard position and near vs far object separation. No main effect was strong, but the age X information-trial reward condition was significant; younger Ss displayed the Moss-Harlow effect but older Ss did not. This finding supports the results of Cross and Vaughter (1966) but not those of Vaughter (1968). Other differences were anticipated on the basis of White's (1965) notions regarding a temporal learning hierarchy.
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