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Related Experiment Videos

Relationships between startle and cardiovascular reactivity

C H Gautier1, E W Cook

  • 1Department of Psychology, University of Alabama, Birmingham 35294, USA.

Psychophysiology
|January 1, 1997
PubMed
Summary
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Fearful individuals show greater cardiac acceleration. Startle responses during imagery predict cardiovascular reactivity to cognitive challenges, suggesting shared affective modulation mechanisms.

Area of Science:

  • Psychophysiology
  • Cardiovascular Research
  • Affective Science

Background:

  • Startle reflex and cardiovascular reactivity are well-studied but their relationship is unclear.
  • Affective modulation of these responses is known, but not fully integrated.
  • Individual differences in fearfulness and family history of cardiovascular disease may influence these relationships.

Purpose of the Study:

  • To investigate the interplay between startle reflex and cardiovascular reactivity.
  • To examine how fearfulness and parental cardiovascular history affect these responses.
  • To determine if affective modulation of startle predicts cardiovascular responses to stress.

Main Methods:

  • 112 normotensive participants completed fearfulness self-reports and provided family history.

Related Experiment Videos

  • Cardiac acceleration and startle blink responses were measured during auditory startle and affective imagery (pleasant/aversive).
  • Cardiovascular responses (heart rate, blood pressure) were assessed during cognitive challenge tasks.

    • Main Results:

    • Fearful individuals exhibited larger initial cardiac acceleration.
    • Startle blink responses were modulated by imagery valence (aversive > pleasant) but not fear group.
    • Cognitive challenge elicited cardiovascular increases unrelated to fearfulness or family history.
    • Aversive imagery potentiation of startle predicted greater pressor response to cognitive challenge, particularly in men.

    Conclusions:

    • Startle potentiation by aversive stimuli is linked to cardiovascular reactivity during cognitive challenge.
    • Findings suggest a common underlying mechanism for affective modulation of startle and cardiovascular responses.
    • Individual differences in fearfulness may influence specific aspects of psychophysiological reactivity.