electrodermal response


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Related to electrodermal response: Psychogalvanic Reflex, galvanic skin responses

Electrodermal response

A transient change in certain electrical properties of the skin, associated with the sweat gland activity and elicited by any stimulus that evokes an arousal or orienting response. Originally termed the psychogalvanic reflex, this phenomenon became known as the galvanic skin response. Electrodermal response (EDR) has replaced galvanic skin response as the collective term.

The skin of a relaxed person has a low electrical conductance (high resistance), and the skin surface is some 40 mV negative with respect to interior tissues. Sweat gland activity changes these electrical properties by increasing skin conductance and by changing the balance of positive and negative ions in the secreted fluid.

Tonic skin conductance varies with psychological arousal, rising sharply when the subject awakens and rising further with activity, mental effort, or especially stress. Phasic skin conductance responses are wavelike increases in skin conductance that begin 1–2 s after stimulus onset and peak within about 5 s. The amplitude of the skin conductance response varies with the subjective impact of the eliciting stimulus, which in turn varies with the intensity of the stimulus, its novelty or unexpectedness for the subject, and its meaning or signal value. Aroused subjects display spontaneous skin conductance responses, generated apparently by mental events or other internal stimuli; their frequency, like the tonic skin conductance level, increases with the level of arousal.

Electrodermal responses are measured in studies of emotion and stress, conditioning, habituation, and cognitive processing, that is, when it is desired to assess the differential or changing impact of a series of stimuli. See Electroencephalography, Sympathetic nervous system

electrodermal response

[i‚lek·trə¦dərm·əl ri′späns]
(physiology)
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We expected the response differences to be qualitatively similar to the typical response differences in the GKT, consisting of higher electrodermal response amplitudes, suppressed respiration, decelerated heart rate, and lower pulse amplitudes to probe than to irrelevant items (Garner et al.
An attempt was thus made to characterize the electrodermal response seen for each condition (activate, rest, and calm) in the two EDA-DMILS studies.
Furthermore, as electrodermal responses are easily discriminable and quantifiable immediately following stimulus presentations, EDA represents a convenient measure of autonomic activity when experimental paradigms involve the repeated presentation of discrete stimuli.
In one study, Lovibond (1963) demonstrated that electrodermal responses of homosexual males could be conditioned, using film clips of nude males as unconditioned stimuli (USs) and abstract symbols as conditioned stimuli (CSs).
Forty-eight sessions meeting minimum criteria for electrodermal responses were included in the analysis.
This interactive program detects electrodermal responses (EDRs) and performs a parameterization.