Wiktionary
superstimulus
n. A supernormal stimulus; an exaggerated version of a stimulus to which there is an existing response tendency, or any stimulus that elicits a response more strongly than the stimulus for which it evolved.
Usage examples of "superstimulus".
The result is a kind of superstimulus — we become sensitive to everything.
They put out a superstimulus cloud of pheromones, human scent-signals of sexual readiness.