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A spontaneous dissociative episode during an EEG experiment

Jamieson, Graham ; Cardeña, Etzel LU orcid and de Pascalis, Vilfredo (2024) In Brain and Cognition 174(February 2024).
Abstract
A depersonalization episode occurred unexpectedly during an electroencephalogram (EEG) recording for a study.
Experience reports tracked the time course of this event and, in conjunction, with EEG data, were analyzed. The
source activity across canonical frequency bands was analyzed across four periods ended by retrospective
experience reports (depersonalization was reported in the 2nd period). Delta and theta decreases occurred across
all time periods with no relation to reported events. Theta and alpha increases occurred in right secondary visual
areas following depersonalization, which also coincided with surges in beta and gamma. The largest increases
occurred in bilateral fronto-polar and medial prefrontal... (More)
A depersonalization episode occurred unexpectedly during an electroencephalogram (EEG) recording for a study.
Experience reports tracked the time course of this event and, in conjunction, with EEG data, were analyzed. The
source activity across canonical frequency bands was analyzed across four periods ended by retrospective
experience reports (depersonalization was reported in the 2nd period). Delta and theta decreases occurred across
all time periods with no relation to reported events. Theta and alpha increases occurred in right secondary visual
areas following depersonalization, which also coincided with surges in beta and gamma. The largest increases
occurred in bilateral fronto-polar and medial prefrontal cortex, followed by inferior left lateral fronto-insulatemporal
cortices and right secondary visual cortex. A high frequency functional network with a principal hub
in left insula closely overlapped inferior left cortical gamma band-power increases. Bilateral frontal increases in
gamma are consistent with studies of dissociation. We interpret gamma and later beta, alpha, and theta band
increases as arising from the generation of visual priors, in the absence of precise visual signals, which constrain
interoceptive and proprioceptive predictions to reestablish a stable sense of physiological-self. Beta showed local
increases following the pattern of gamma but showed no changes in functional connectivity. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dissociation, depersonalization, ganzfeld, EEG gamma band, left insula, sense of self, predictive coding
in
Brain and Cognition
volume
174
issue
February 2024
article number
106121
publisher
Academic Press
external identifiers
  • scopus:85181040062
ISSN
0278-2626
DOI
10.1016/j.bandc.2023.106121
language
English
LU publication?
yes
id
a141f7ff-682e-4cf3-a8c2-7dc26c1e8214
date added to LUP
2023-12-25 09:05:20
date last changed
2024-02-13 11:39:41
@article{a141f7ff-682e-4cf3-a8c2-7dc26c1e8214,
  abstract     = {{A depersonalization episode occurred unexpectedly during an electroencephalogram (EEG) recording for a study.<br/>Experience reports tracked the time course of this event and, in conjunction, with EEG data, were analyzed. The<br/>source activity across canonical frequency bands was analyzed across four periods ended by retrospective<br/>experience reports (depersonalization was reported in the 2nd period). Delta and theta decreases occurred across<br/>all time periods with no relation to reported events. Theta and alpha increases occurred in right secondary visual<br/>areas following depersonalization, which also coincided with surges in beta and gamma. The largest increases<br/>occurred in bilateral fronto-polar and medial prefrontal cortex, followed by inferior left lateral fronto-insulatemporal<br/>cortices and right secondary visual cortex. A high frequency functional network with a principal hub<br/>in left insula closely overlapped inferior left cortical gamma band-power increases. Bilateral frontal increases in<br/>gamma are consistent with studies of dissociation. We interpret gamma and later beta, alpha, and theta band<br/>increases as arising from the generation of visual priors, in the absence of precise visual signals, which constrain<br/>interoceptive and proprioceptive predictions to reestablish a stable sense of physiological-self. Beta showed local<br/>increases following the pattern of gamma but showed no changes in functional connectivity.}},
  author       = {{Jamieson, Graham and Cardeña, Etzel and de Pascalis, Vilfredo}},
  issn         = {{0278-2626}},
  keywords     = {{dissociation; depersonalization; ganzfeld; EEG gamma band; left insula; sense of self; predictive coding}},
  language     = {{eng}},
  number       = {{February 2024}},
  publisher    = {{Academic Press}},
  series       = {{Brain and Cognition}},
  title        = {{A spontaneous dissociative episode during an EEG experiment}},
  url          = {{https://lup.lub.lu.se/search/files/167429371/depers_case.pdf}},
  doi          = {{10.1016/j.bandc.2023.106121}},
  volume       = {{174}},
  year         = {{2024}},
}