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Related Experiment Videos

Defensive responses to phobic stimuli.

R D Hare, G Blevings

    Biological Psychology
    |July 1, 1975
    PubMed
    Summary

    Spider phobia triggers a defensive response (DR) in females, characterized by increased heart rate and vasoconstriction. Non-phobic females exhibit an orienting response (OR) with heart rate deceleration and vasodilation when viewing spiders.

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    Area of Science:

    • Psychophysiology
    • Fear Research
    • Human Behavior

    Background:

    • Phobias represent exaggerated fear responses to specific stimuli.
    • Understanding the physiological underpinnings of phobias is crucial for developing effective treatments.
    • Distinguishing between defensive and orienting responses provides insight into fear processing.

    Purpose of the Study:

    • To investigate the distinct physiological responses to feared (spiders) and neutral stimuli in individuals with and without spider phobia.
    • To differentiate between the defensive response (DR) and orienting response (OR) patterns in the context of arachnophobia.

    Main Methods:

    • Physiological recordings, including heart rate (HR), cephalic vasoconstriction, and palmar skin conductance (SC), were obtained from two groups of females: those with spider phobia (group P) and a non-phobic control group (group N).
    • Participants viewed a randomized series of spider and neutral slides.
    • Data analysis focused on comparing physiological patterns between groups and stimulus types.

    Main Results:

    • Group P exhibited a defensive response (DR) to spider slides, characterized by HR acceleration, cephalic vasoconstriction, and increased SC.
    • Group N displayed an orienting response (OR) to spider slides, with HR deceleration, cephalic vasodilation, and increased SC.
    • Neutral slides elicited minimal responses in group N but triggered orienting response components in group P, likely due to contrast effects.
    • The DR pattern in group P, involving HR acceleration and cephalic vasoconstriction, was observed even without apparent increases in somatic activity.

    Conclusions:

    • Spider phobia is associated with a distinct psychophysiological defensive response pattern.
    • Fear conditioning and stimulus contrast may influence orienting responses in phobic individuals.
    • Cephalic vasoconstriction and heart rate acceleration are key components of the defensive response in arachnophobia, independent of general somatic activity.

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