A spontaneous dissociative episode during an EEG experiment
Jamieson, Graham ; Cardeña, Etzel LU
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:
https://lup.lub.lu.se/record/a141f7ff-682e-4cf3-a8c2-7dc26c1e8214
- author
- Jamieson, Graham
; Cardeña, Etzel
LU
and de Pascalis, Vilfredo
- organization
- publishing date
- 2024
- 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
- pmid:38142536
- 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
- 2024-07-05 03:00:15
@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}},
}