In the same way that an adult might ignore a dog repeatedly barking outside, a fetus tends to respond less to stimuli that repeat or remain constant. This behavior is called:

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Habituation is the process by which an organism decreases or ceases its responses to a stimulus after repeated or prolonged presentations. Essentially, the organism learns to stop responding to a stimulus which is no longer biologically relevant. In the context of a fetus responding less to repeated or constant stimuli, this is a classic example of habituation.

In the Same Way That an Adult Might Ignore a Dog