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The term instinctual impulse (Triebregung), designating the initial, productive, and local form of an instinct active within the psyche, emphasizes its intrinsic emotional dynamic. Trieb is the "instinct" or "drive." Regung means "movement of the heart or soul, a nascent feeling, a stirring of the heart, an emotion." Literally, Triebregung is the "emotional momentum of the instinct."
Instinct or innate behavior is the inherent inclination of a living organism toward a particular behavior.
The simplest example of an instinctive behavior is a fixed action pattern, in which a short sequence of actions, without variation, are carried out in response to a clearly defined stimulus. However, instinctive behaviors can also be variable and responsive to the environment. Any behavior is instinctive if it is performed without being based upon prior experience, that is, in the absence of learning.
Source: Wikipedia, the free encyclopedia