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Effects of extraversion and mental arithmetic on heart-rate reactivity
1Old Dominion University, Norfolk, VA 23529-0267.
Perceptual and Motor Skills
|June 1, 1991
Summary
Introverts exhibited greater heart-rate reactivity to mental arithmetic tasks than extraverts, with reactivity increasing alongside task difficulty. These findings offer partial support for Eysenck
Area of Science:
- Psychology
- Physiology
- Personality Science
Background:
- Extraversion is a key personality trait linked to differences in cortical arousal.
- Eysenck's theory posits that introverts have higher baseline arousal and seek less stimulation than extraverts.
Purpose of the Study:
- To investigate the influence of extraversion and task difficulty on physiological arousal, specifically heart-rate reactivity.
- To test Eysenck's physiological theory of extraversion.
Main Methods:
- Participants: 15 extraverts and 15 introverts identified via the Eysenck Personality Inventory.
- Task: Participants completed mental arithmetic problems at three difficulty levels.
- Measurement: Heart-rate reactivity was monitored throughout the task.
Main Results:
- Heart-rate reactivity significantly increased with higher task difficulty.
- Introverts demonstrated significantly greater heart-rate reactivity compared to extraverts.
- A two-way analysis of variance confirmed these findings.
Conclusions:
- Task difficulty is a significant factor influencing heart-rate reactivity.
- Introverted individuals exhibit heightened physiological arousal in response to challenging cognitive tasks.
- Findings partially support Eysenck's theory, suggesting differences in arousal responses but requiring further investigation into underlying mechanisms.
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