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On the basis of her study of transposition in the two-stimulus problem in young children, Kuenne (1946) proposed that there are at least two developmental stages so far as the relation of verbal responses to overt choice behavior is concerned. In the first, the child is able to make differential verbal responses to appropriate aspects of the situation, but this verbalization does not control or influence his overt choice behavior. Later, such verbalizations gain control and dominate choice behavior (p. 488).Similarly, Kendler, Kendler, and Wells (1960) suggested in a study of reversal and nonreversal shifts in discrimination learning in preschool subjects (5s) that there is a stage in human development in which verbal responses, though available, do not readily mediate between external stimuli and overt responses (p. 87