Nonassociative learning is called habituation which can be defined as the decrease in response to a repeated stimulus which has no positive or negative consequences.
Habituation is a psychological learning process wherein there is a decrease in response to a stimulus. This concept says that a human or an animal may learn to avoid or ignore a stimulus because of repeated exposure to it. It occurs to animals when that animal is exposed to the same stimuli repeatedly and eventually stops responding to that stimulus.
In biology, a stimulus can be defined as a detectable change (chemical or physical) in the environment of an organism which results in some functional activity.
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