Association between Anomalous Subjective Recall and Long-Range Temporal Correlations in Resting-State EEG: An Individual-Differences Study of Depersonalization Tendency
Kazuki Yamamoto, Jianhong Zhu, Junya Hashimoto, Tatsuru Honda, Tsuyoshi Kawahara, Mayo Anno, Genki Yasui, Ren Sakamoto, Takashi Nakao
Study at a glance
AI-extracted from the abstract| Characteristics | Observational cross-sectional study |
|---|---|
| Sample size | 81 |
| Population | Healthy adults |
| Duration | 5 minutes of eyes-closed resting-state EEG |
| Measures | Japanese Cambridge Depersonalization Scale, detrended fluctuation analysis exponent |
| Key findings | Higher anomalous subjective recall was significantly negatively correlated with the alpha-band detrended fluctuation analysis exponent at FCz after adjustment for covariates, suggesting reduced long-range temporal correlations. In a multiple regression including other depersonalization dimensions, the association remained negative but was not statistically significant, so the authors describe the evidence as preliminary and correlational, with limited support for symptom-level specificity. |
Abstract
Anomalous subjective recall refers to autobiographical memories whose factual content can be retrieved but are not experienced as one’s own, instead feeling alien. It is thought to reflect disrupted temporal self-continuity during depersonalization; however, its neural basis remains poorly understood. Because task-based measures may be less suitable for capturing trait-like alterations in neural dynamics, resting-state electroencephalography may provide a useful marker of such disturbances. We examined whether higher levels of anomalous subjective recall are associated with lower alpha-band long-range temporal correlations. Eighty-one healthy adults completed the Japanese Cambridge Depersonalization Scale and underwent 5 minutes of eyes-closed resting-state electroencephalography. Alpha-band long-range temporal correlations were quantified at FCz using the detrended fluctuation analysis exponent. We tested the hypothesis that higher anomalous subjective recall would be associated with lower values, controlling for age, sex, body mass index, and the number of artifact-free epochs. Anomalous subjective recall showed a significant negative partial Spearman correlation with the detrended fluctuation analysis exponent at FCz. In a multiple regression model including anomalous subjective recall and other depersonalization dimensions, the coefficient for anomalous subjective recall remained negative but was not statistically significant. These findings provide preliminary correlational evidence that reduced temporal integration in frontocentral alpha-band activity may be associated with subjective disconnection from autobiographical memories, although evidence for symptom-level specificity remains limited.