paradoxical heat
   A term used to denote the * thermal illusion of heat that may arise during prolonged intense skin cooling, typically upon the return of skin temperature to a neutral level after intense cooling (for example, on moving indoors after having been outside on a cold day). Paradoxical heat is a physiological response that may be experienced by any individual. However, it may take on pathological dimensions in a number of central as well as peripheral neurological conditions such as frostbite, multiple sclerosis, and peripheral neuropathy. Various hypotheses exist regarding the neurophysiological correlates of paradoxical heat. In healthy subjects, the mediation of paradoxical heat is attributed primarily to peripheral conductance via the slow, unmyelinated C fibres, or via the faster A<5 fibres. However, the established increase in the susceptibility to paradoxical heat in central neurological conditions is strongly suggestive of a central involvement. The nature of this central involvement is unknown, but empirical research would seem to suggest an involvement of the right insular cortex. Conceptually, the term paradoxical heat is used in opposition to * paradoxical cold. Both phenomena are usually classified as illusions, more specifically, as * physiological illusions or * perceiver-distortion illusions.
   References
   Davis, K.D., Pope, G.E., Crawley, A.P., Mikulis, D.J. (2004). Perceptual illusion of "paradoxical heat" engages the insular cortex. Journal of Neurophysiology, 92, 1248-1251.

Dictionary of Hallucinations. . 2010.

Look at other dictionaries:

  • paradoxical cold —    A term introduced in or shortly before 1895 by the Austrian physician and physiologist Max von Frey (1852 1932) to denote the *thermal illusion of coldness that may arise when a stimulus in the range of 45 50°C is applied to the skin.… …   Dictionary of Hallucinations

  • Heat capacity — Thermodynamics …   Wikipedia

  • Urban heat island — An urban heat island (UHI) is a metropolitan area which is significantly warmer than its surrounding rural areas. The temperature difference usually is larger at night than during the day and larger in winter than in summer, and is most apparent… …   Wikipedia

  • illusion — illusioned, adj. /i looh zheuhn/, n. 1. something that deceives by producing a false or misleading impression of reality. 2. the state or condition of being deceived; misapprehension. 3. an instance of being deceived. 4. Psychol. a perception, as …   Universalium

  • Referred itch — An diagram showing the connected points between stimulus and itch. Mitempfindung, or referred itch, is the phenomenon in which a stimulus applied in one region of the body is felt as an itch or irritation in a different part of the body. The… …   Wikipedia

  • thermal illusion —    Also known as temperature illusion. Both terms are used to denote a misperception or misinterpretation of temperature stimuli. Examples of thermal illusions are paradoxical cold and paradoxical heat.    References    Long, R.R. (1977).… …   Dictionary of Hallucinations

  • Hypothermia — This article is about the adverse condition of Hypothermia. For deliberately induced cooling, see Therapeutic hypothermia. For the 2010 horror film, see Hypothermia (film). Hypothermia Classification and external resources During Napoleon… …   Wikipedia

  • literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …   Universalium

  • fluid mechanics — an applied science dealing with the basic principles of gaseous and liquid matter. Cf. fluid dynamics. [1940 45] * * * Study of the effects of forces and energy on liquids and gases. One branch of the field, hydrostatics, deals with fluids at… …   Universalium

  • Reflex — A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in response to a stimulus applied to the periphery and transmitted to the… …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”