Abstract
Two experiments concerned with the effects of age on transposition were conducted In the first experiment neonatal and adult monkeys learned an area discrimination with great difficulty. Two adults transposed the learned discrimination to stimuli smaller than the original, but the mean transposition scores for neonatal monkeys were not significant. In the second experiment, 1-yr.-old and adult monkeys were slow to learn a brightness discrimination. Two adults and all of the infants showed consistent and significant transposition to darker stimuli, but performed at chance level to stimuli removed more than one step interval from the original learning on the lighter side. It is concluded that transposition is probably more closely tied to the variables affecting single-problem learning rather than to those affecting multiple-problem learning.