Effects of extraversion and mental arithmetic on heart-rate reactivity

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.