Gamma band activity and its synchronization reflect the dysfunctional emotional processing in alexithymic persons

Area of Science:

• Neuroscience
• Psychology
• Affective Science

Background:

• Alexithymia is a personality trait characterized by difficulties in identifying and describing emotions.
• Gamma band activity in electroencephalography (EEG) is associated with cognitive and emotional processing.
• Understanding neural correlates of alexithymia is crucial for mental health research.

Purpose of the Study:

• To investigate gamma band responses and phase synchrony in individuals with varying levels of alexithymia.
• To examine how emotional stimuli modulate gamma band activity in alexithymia.
• To explore potential neural underpinnings of emotional processing deficits in alexithymia.

Main Methods:

• EEG recordings were obtained from participants with high and low alexithymia scores (assessed via the 20-item Toronto Alexithymia Scale).
• Participants viewed emotionally negative and neutral stimuli.
• Analysis focused on gamma band power and inter-electrode phase synchronization.

Main Results:

• Nonalexithymic individuals showed increased gamma band power and phase synchronization when processing negative emotional stimuli.
• Alexithymic individuals did not exhibit enhanced gamma band activity or phase synchronization in response to negative stimuli.
• A specific time window (400-450 ms) was identified for these differential responses.

Conclusions:

• Gamma band activity appears to reflect emotional processing, particularly in response to negative stimuli.
• Alexithymia may be associated with impaired communication between brain regions or reduced utilization of emotional/memory information.
• These findings highlight potential neural mechanisms underlying emotional processing difficulties in alexithymia.