Humans and other animals gradually learn what sounds or other sensory cues in their surroundings are meaningful or potentially threatening. Via a process known as habituation, they gradually learn to ignore non-threatening stimuli so that they can focus on new, unknown, and more significant events happening in their environment. This innate sensory filtering process prevents the nervous system from becoming overwhelmed by the flow of sensory information that animals and humans are constantly exposed to during waking hours.
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