1 A badge or insignia consisting of stripes meeting at an angle, worn on the sleeve of a military or police uniform to indicate rank, merit, or length of service. 2  n. Heraldry A device shaped like an inverted V.  n.
In physiology, a stimulus (plural stimuli) is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity.When a stimulus is applied to a sensory receptor, it normally elicits or influences a reflex via stimulus transduction.ne internal stimulus that causes hormone release is blood pressure. Hypotension, or low blood pressure, is a large driving force for the release of vasopressin, a hormone which causes the retention of water in the kidneys.
coupling of the neural or endocrine stimulus to the cellular response. structured stimulus. a well-organized and unambiguous stimulus, the perception of which is influenced to a greater extent by the characteristics of the stimulus than by those of the perceiver.threshold stimulus. a stimulus that is just strong enough to elicit a response.unconditioned stimulus. any stimulus that is capable of eliciting an unconditioned response. See also conditioning.hreshold stimulus a stimulus that is just strong enough to elicit a response. unconditioned stimulus any stimulus that naturally evokes a specific response; see also conditioning.