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Dedication - Impress Communications
Dedication - Impress Communications

... Anatomy forms a foundation of clinical medicine and surgery and is a visual science of human structures. Thus, the success of learning and understanding largely depends on the quality of dissection and on clear accurate illustrations. Many of the illustrations are simple schematic drawings, which ar ...
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Abstract - BMB Reports
Abstract - BMB Reports

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nitz - UCSD Cognitive Science

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PDF

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2015 International Joint Conference on Neural Networks

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Materials - Web Adventures

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Stimulus (physiology)



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. These sensory receptors can receive information from outside the body, as in touch receptors found in the skin or light receptors in the eye, as well as from inside the body, as in chemoreceptors and mechanorceptors. An internal stimulus is often the first component of a homeostatic control system. External stimuli are capable of producing systemic responses throughout the body, as in the fight-or-flight response. In order for a stimulus to be detected with high probability, its level must exceed the absolute threshold; if a signal does reach threshold, the information is transmitted to the central nervous system (CNS), where it is integrated and a decision on how to react is made. Although stimuli commonly cause the body to respond, it is the CNS that finally determines whether a signal causes a reaction or not.
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