The cortical functional connectivity basis of dissociative absorption tendency: A study using weighted Phase Lag Index

Background

Dissociative absorption is a dissociative experience characterized by deep immersion in activities such as imagination and daydreaming, leading to a diminished awareness of surroundings. Previous research has suggested that dissociative experiences may be associated with lower cortical functional connectivity.

Purpose

This study aimed to investigate the relationship between dissociative absorption tendency and resting-state electroencephalographic (EEG) functional connectivity using the weighted Phase Lag Index (wPLI).

Methods

Forty-four healthy participants underwent resting-state EEG recordings. Dissociative absorption tendency was assessed using the Dissociative Experiences Scale (DES). Functional connectivity was analyzed across multiple frequency bands using wPLI, and spectral power was also examined.

Results

Significant negative partial correlations were found between dissociative absorption tendency and functional connectivity in the delta (C3–P3, C3–T6, T4–T6) and theta (P4–O1) bands, with Bayes factors exceeding 3. In contrast, positive partial correlations were observed in the alpha2 (Fp1–T3, F3–T3) band. Spectral power analysis further indicated higher delta power in individuals with higher dissociative absorption tendency.

Conclusions

The lower functional connectivity in the delta and theta bands is consistent with previous research. In contrast, the alpha2 band exhibited a higher connectivity pattern, suggesting the need for a more comprehensive investigation of its relationship with cortical neural activity across different frequency bands. Based on our findings, the relationship between dissociative absorption, functional connectivity, and a mixed state between wakefulness and sleep is discussed.