Sex differences and emotion regulation: an event-related potential study

Area of Science:

• Cognitive Neuroscience
• Psychophysiology
• Affective Science

Background:

• Difficulties in emotion regulation are linked to anxiety and mood disorders.
• Heightened female prevalence for these disorders may stem from sex differences in emotion regulation.
• Previous fMRI studies on sex differences in emotion regulation yielded mixed results.

Purpose of the Study:

• To investigate sex differences in early emotional reactivity and emotion regulation using event-related potentials (ERPs).
• To examine the neural underpinnings of emotion regulation strategies (increase, decrease, maintain) in men and women.
• To test the female negativity bias hypothesis concerning emotional responses to negative stimuli.

Main Methods:

• Recorded event-related potentials (ERPs), specifically N1, N2, P3, and Late Positive Potential (LPP) components.
• Participants (20 men, 23 women) passively viewed negative images.
• Instructed participants to 'increase,' 'decrease,' or 'maintain' their emotional response.

Main Results:

• Women showed significantly greater N1 and N2 amplitudes (early emotional reactivity) to negative stimuli compared to men.
• LPP amplitudes increased with the 'increase' instruction; women exhibited greater LPP amplitudes than men for this instruction.
• No significant sex differences were observed for the 'decrease' emotion regulation instruction.

Conclusions:

• Findings support the female negativity bias hypothesis, indicating women have greater early emotional reactivity to negative stimuli.
• Women demonstrate enhanced up-regulation of emotional responses to negative stimuli, evidenced by greater LPP amplitudes.
• These sex differences in emotion regulation may contribute to the higher vulnerability of women to anxiety disorders.