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Time of day effects on extroversion and salivation.
Biological Psychology
|December 1, 1975
Summary
This study investigated circadian rhythms in extroversion-introversion (E-I) using the EPI and lemon juice test (LJT). No significant circadian rhythm in E-I was detected, suggesting time-of-day affects LJT applicability.
Area of Science:
- Psychology
- Chronobiology
- Personality Science
Background:
- Extroversion-introversion (E-I) is a fundamental personality trait.
- Circadian rhythms influence various biological and psychological processes.
- The potential link between circadian rhythms and E-I is underexplored.
Purpose of the Study:
- To investigate a potential circadian rhythm in the biological basis of extroversion-introversion.
- To examine the relationship between EPI E-I scores and lemon juice test (LJT) scores at different times of day.
Main Methods:
- Eighty subjects completed the EPI E-I questionnaire and the LJT.
- Assessments were conducted in the a.m. and p.m. on the same day.
- Correlations between EPI E-I and LJT scores were analyzed based on time of day.
Main Results:
- High intra-test correlations were observed for both EPI E-I and LJT.
- A significant correlation between EPI E-I and LJT was found only in the a.m.
- No significant correlation was detected between EPI E-I and LJT in the p.m.
Conclusions:
- A circadian rhythm in extroversion-introversion could not be detected using the employed measures.
- The applicability of the lemon juice test to assess E-I is dependent on the time of day and measurement procedure.