stimulant

Stimulants-- Appetite stimulates eating. Thirst stimulates drinking. Heat stimulates sweating. Cold stimulates shivering. Curiosity stimulates thinking. Music stimulates moods. Sleep stimulates dreams. Pain stimulates anguish . Pleasure stimulates bliss. Trespass stimulates retribution. Retreat stimulates chase. Opportunity stimulates predation. Celebrity stimulates publicity. Habit stimulates repetition. Females stimulate males. Necessity stimulates invention. Energy stimulates activity. Doubtless there are many more stimulants, beyond these few that i have named. Feel free to suggest them. Usually, the subject can stimulate the object and the object can stimulate the subject.