Answer:
He is showing a decreased responsiveness to a stimulus.
Explanation:
According to conditioning theory, habituation is the decreased responsiveness to a stimulus after repeated presentations of that stimulus. The term is used to describe behavior that has not been conditioned and is a product of unconscious processes, like reflexes.
In this case, the stimulus has not been associated with any reinforcement, the baby's response to the sound of the keys is a reflex which, after several presentations of the same stimulus, decreases.
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