Four adult rhesus monkeys were trained to take one disc of banana at a time from a tray containing 25 different discs which varied systematically in size (height and diameter) and distance from S. The order in which the pieces were taken indicated the rank order of preference for size and distance. Initially nearer food was taken first regardless of size, but, over time, selection was determined increasingly by size until all Ss demonstrated considerable but not perfect size constancy.
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