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1. The reaction of a muscle, nerve, gland, or other excitable tissue to a stimulus. 2. Any act or behavior, or its constituents, that a living organism is capable of emitting. Reflexes are usually excluded because they are typically elicited by a specifiable (unconditioned or natural) stimulus rather than emitted under circumstances in which the stimulus was not specifiable. [L. responsus, an answer]
anamnestic r. (an´am-nes-tik) secondary immune r See immune r.
biphasic r. 1. two separate and distinct responses that are separated in time; 2. immediate reaction to an antigenic challenge followed by a recurrence of symptoms after an interval of quiescence.
booster r. secondary immune r See immune r.
conditioned r. a r. already in an individual's repertoire but which, through repeated pairings with its natural stimulus, has been acquired or conditioned anew to a previously neutral or conditioned stimulus. See conditioning. Cf. unconditioned r.
Cushing r. Cushing phenomenon
depletion r. subnormal metabolic r. to trauma in a person whose physiologic processes are already depressed by disease.
early-phase r. prompt onset of symptoms following an antigenic stimulus.
evoked r. an alteration in the electrical activity of a region of the nervous system through which an incoming sensory stimulus is passing; may be somatosensory (SER), auditory (BAER), or visual (VER). See also evoked potential.
flight or fight r. See emergency theory.
galvanic skin r. (GSR) a measure of changes in emotional arousal recorded by attaching electrodes to any part of the skin and recording changes in moment-to-moment perspiration and related autonomic nervous system activity.galvanic skin reaction, galvanic skin reflex, psychogalvanic reaction, psychogalvanic skin reaction, psychogalvanic reflex, psychogalvanic skin reflex, psychogalvanic r., psychogalvanic skin r;
Henry-Gauer r. inhibition of antidiuretic hormone secretion due to a rise in atrial pressure which stimulates atrial stretch receptors.
immune r. 1. any r. of the immune system to an antigen including antibody production and/or cell-mediated immunity; 2. the r. of the immune system to an antigen (immunogen) that leads to the condition of induced sensitivity; the immune r. to the initial antigenic exposure (primary immune r.) is detectable, as a rule, only after a lag period of from several days to two weeks; the immune r. to a subsequent stimulus (secondary immune r.) by the same antigen is more rapid than in the case of the primary immune r.
isomorphic r. Köbner's phenomenon
late-phase r. recurrence of symptoms after an appreciable interval following challenge with an antigen; preceded by an initial early-phase r.
oculomotor r. widespread myogenic potential evoked by visual stimuli.
orienting r. orienting reflex
primary immune r. See immune r.
psychogalvanic r. (PGR) , psychogalvanic skin r. galvanic skin r
recruiting r. recruitment (2)
relaxation r. an integrated hypothalamic reaction resulting in decreased sympathetic nervous system activity which, physiologically and psychologically, is almost a mirror image of the body's r.'s to Cannon's emergency theory (flight or fight r.); can be self-induced through the use of techniques associated with transcendental meditation, yoga, and biofeedback. See also emergency theory.
secondary immune r. anamnestic r., booster r; See immune r.
sonomotor r. widespread myogenic potential evoked by click stimulation.
stringent r. the cellular response to amino acid starvation that reduces the amount of ribosomes to what can be employed under the nutrient conditions.
target r. operant
triple r. the triphasic r. to the firm stroking of the skin: Phase 1 is the sharply demarcated erythema that follows a momentary blanching of the skin, and is the result of release of histamine from the mast cells. Phase 2 is the intense red flare extending beyond the margins of the line of pressure but in the same configuration, and is the result of arteriolar dilation; also called axon flare because it is mediated by axon reflex. Phase 3 is the appearance of a line wheal in the configuration of the original stroking.
unconditioned r. a r., such as salivation, which is a part of the animal or human repertoire. Cf. conditioned r.
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