Basic emotions induced by odorants: a new approach based on autonomic pattern results.

Area of Science:

• Neuroscience
• Psychology
• Physiology

Background:

• The connection between olfactory stimuli and emotional processing is complex.
• Previous research suggests odorants can evoke basic emotions, but physiological correlates require further investigation.

Purpose of the Study:

• To investigate the link between specific odorants and basic emotions (anger, fear, sadness, surprise, disgust, happiness).
• To determine if distinct autonomic nervous system (ANS) response patterns correlate with specific emotions evoked by odorants.

Main Methods:

• 15 subjects inhaled five distinct odorants (lavender, ethyl aceto acetate, camphor, acetic acid, butyric acid).
• Autonomic responses including skin potential/resistance, blood flow/temperature, respiratory frequency, and heart rate were monitored.
• Subjects rated odorant pleasantness; a decision tree correlated ANS patterns with basic emotions.

Main Results:

• Analysis differentiated odorants based on ANS responses, distinguishing between pleasant and unpleasant odors.
• Lavender and ethyl aceto acetate were associated with happiness; acetic and butyric acids with anger/disgust.
• Camphor evoked varied emotions (happiness, surprise, sadness) based on individual history; a strong correlation existed between hedonic evaluation and ANS-derived emotions.

Conclusions:

• Multiparametric ANS analysis can identify the quality (type) of basic emotion evoked by olfactory stimuli.
• Findings suggest a physiological basis for linking specific odorants to distinct emotional states.
• Results were validated across multiple experiments with over 60 subjects, confirming the reliability of ANS-based emotion identification.