impulse

In psychology, an impulse is a sudden, strong urge or desire to act without forethought. This can manifest as a failure to resist temptations that may be harmful to oneself or others, often accompanied by a feeling of tension before the act and release afterward. Examples include pathological gambling, pyromania, kleptomania, and trichotillomania.123

In a broader sense, an impulse can also be a stimulus or motivation that arouses action or activity, or a habitual attraction to a particular activity or thing, such as the instinct for self-preservation. The human nervous system processes sensory input and generates nerve impulses, which are crucial for perception and reaction, though the exact mechanisms are still being researched.124