In physiology, a stimulus is a change in a living thing's internal or external environment. This change can be detected by an organism or organ using sensitivity, and leads to a physiological reaction. Sensory receptors can receive stimuli 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 mechanoreceptors. When a stimulus is detected by a sensory receptor, it can elicit a reflex via stimulus transduction. 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 of strength 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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Sensitivity (physiology) in the context of Critic
A critic is a person who communicates an assessment and an opinion of various forms of creative works such as art, literature, music, cinema, theater, fashion, architecture, and food. Critics may also take as their subject social or government policy. Critical judgments, whether derived from critical thinking or not, weigh up a range of factors, including an assessment of the extent to which the item under review achieves its purpose and its creator's intention and a knowledge of its context. They may also include a positive or negative personal response.
Characteristics of a good critic are articulateness, preferably having the ability to use language with a high level of appeal and skill. Sympathy, sensitivity and insight are also important. Form, style and medium are all considered by the critic. In architecture and food criticism, the item's function, value and cost may be added components.
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