International Journal of Psychophysiology
July 13, 2007
René Scheeringa, Marcel C.M. Bastiaansen, Karl Magnus Petersson et al.
415 citations
Simultaneous EEG and fMRI recordings in resting subjects with eyes open showed that fluctuations in frontal theta power are not positively correlated with brain activity in any area. Instead, strong negative correlations were found in regions that together form the default mode network, indicating that frontal theta activity serves as an EEG marker of default mode network deactivation.
PsyArXiv
April 13, 2025
Teresa Campillo-Ferrer, Antonella Iadarola, Ramona Cordani et al.
1 citation
preprint
During the transition from wakefulness to sleep, unusual bodily sensations and out-of-body experiences can be induced. A high-density EEG and neurophenomenology approach reveals specific brain activity patterns associated with these phenomena, suggesting that the brain's altered state during sleep onset may facilitate such experiences.
Consciousness and Cognition
February 11, 2026
Teresa Campillo-Ferrer, Antonella Iadarola, Ramona Cordani et al.
Unusual bodily experiences (UBEs)—illusory perceptions such as floating, body distortions, or out-of-body sensations—can occur during meditation and sleep. In a controlled sleep laboratory, 20 of 35 healthy participants reported 36 UBEs, primarily during meditation (wakefulness) but also during arousals, REM sleep, and non-REM sleep. Electroencephalography (EEG) analyses revealed that UBEs emerge during intermediate states of consciousness that combine features of wakefulness and sleep. Specifically, UBEs were associated with EEG reactivation: increased high-frequency activity (beta and gamma) and decreased low-frequency activity (delta and theta), especially around temporal regions. These findings offer new insights into the neural correlates of self-consciousness and body perception across sleep and wakefulness.