When young infants modify their voluntary behaviors to see and hear things or to be touched,psychologists can conclude that

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The fact that young infants modify their voluntary behavior (i.e. moving their head or body) in response to visual and auditory events suggests that these sensory stimuli serve as powerful reinforcers for them. This is evidence of operant conditioning, which involves modifying behavior based on its consequences.

When Young Infants Modify Their Voluntary Behaviors to See and Hear