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Related Experiment Videos

Basic emotions evoked by odorants: comparison between autonomic responses and self-evaluation

O Alaoui-Ismaïli1, O Robin, H Rada

  • 1Université Claude Bernard, Lyon I, Villeurbanne, France.

Physiology & Behavior
|October 1, 1997
PubMed
Summary

This study found that physiological responses (autonomic nervous system) and self-reported emotions align well, especially for pleasant smells. However, anger is more strongly detected physiologically than verbally.

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Area of Science:

  • Neuroscience
  • Psychology
  • Physiology

Background:

  • Basic emotions are fundamental to human experience.
  • Understanding the link between subjective feelings and physiological responses is crucial.
  • Odorants are potent triggers of emotional and physiological reactions.

Purpose of the Study:

  • To analyze the relationship between self-reported and physiological expressions of basic emotions in response to odorants.
  • To compare conscious (verbal) and unconscious (autonomic nervous system) emotional estimations.
  • To investigate the accuracy of physiological measures in identifying emotions evoked by smells.

Main Methods:

  • 44 subjects inhaled five distinct odorants.
  • Six autonomic nervous system (ANS) parameters were continuously recorded.

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  • Subjects provided verbal identification, hedonic ratings, and emotion classification for each odorant.

    • Main Results:

    • Pleasant odorants (vanillin, menthol) evoked happiness and surprise physiologically and verbally.
    • Unpleasant odorants (methyl methacrylate, propionic acid) evoked disgust and anger, with a significant difference between verbal (disgust) and physiological (anger) reports.
    • Eugenol elicited mixed pleasant and unpleasant responses, showing variability in both verbal and physiological data.

    Conclusions:

    • There is a good correlation between verbal and ANS-estimated basic emotions.
    • Physiological responses (ANS) are a more sensitive indicator of anger than verbal self-reports.
    • The study highlights the complex interplay between conscious perception and unconscious physiological reactions to olfactory stimuli.