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Related Experiment Videos

Cardiac self-perception in obese and normal persons.

R M Gardner1, J A Morrell, D N Watson

  • 1Department of Psychology, University of Southern Colorado, Pueblo 81001.

Perceptual and Motor Skills
|June 1, 1990
PubMed
Summary

Obese individuals perceive their heartbeats similarly to normal-weight individuals, showing no difference in sensory sensitivity. However, obese subjects exhibited a more relaxed response bias in a heartbeat detection task.

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Area of Science:

  • Psychology
  • Physiology
  • Obesity Research

Background:

  • Obesity is often linked to differences in interoception and self-perception.
  • Schachter's internality-externality theory suggests external cues influence eating behavior in obese individuals.

Purpose of the Study:

  • To investigate cardiac self-perception in obese versus normal-weight individuals.
  • To differentiate sensory sensitivity from response bias in heartbeat detection.

Main Methods:

  • Utilized a heartbeat detection task where participants judged auditory tone synchrony with their own heartbeat.
  • Employed signal-detection analysis to quantify sensory sensitivity (d') and response bias (Ln beta).

Main Results:

  • Participants could detect their heartbeat (average d' = .58).

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  • No significant differences in sensory sensitivity (d') were found between obese and normal-weight subjects or by sex.
  • Obese subjects demonstrated a significantly more lax response criterion (Ln beta) than normal-weight subjects.

    • Conclusions:

    • Obesity is not associated with altered sensory sensitivity to internal bodily signals like the heartbeat.
    • Differences in response bias, rather than sensory perception, may differentiate obese individuals in interoceptive tasks.
    • Findings have implications for understanding obesity and developing weight control strategies.