Sex differences in patterns of EEG asymmetry

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychophysiology

Background:

• Sex differences in brain activity are increasingly recognized.
• Electroencephalography (EEG) asymmetry is a marker of regional brain activation.
• Previous research suggests potential sex differences in cognitive and affective processing.

Purpose of the Study:

• To investigate sex differences in EEG asymmetry during self-generated cognitive and affective tasks.
• To explore whether females exhibit greater bilateral brain flexibility than males.
• To examine sex differences in EEG asymmetry during biofeedback training.

Main Methods:

• Bilateral EEG recordings were used to quantify alpha activity.
• Participants engaged in self-generated tasks including whistling, singing, reciting lyrics, and inducing affective states.
• EEG asymmetry was measured during these tasks and during biofeedback training.

Main Results:

• Females showed significant EEG asymmetry during whistling and talking, unlike males.
• Females displayed greater relative right-hemisphere activation during induced emotional states compared to non-emotional states.
• Females demonstrated greater percent time asymmetry and better control during biofeedback training.

Conclusions:

• Findings support greater bilateral flexibility in females during self-generated cognitive and affective tasks.
• Sex differences in EEG asymmetry suggest distinct patterns of brain activation between males and females.
• These results contribute to understanding the neurobiological underpinnings of sex differences in cognitive and emotional processing.