Krüger, Christina (1998) The state scale of dissociation : development, psychometric validation, and application in a study of concurrent electro-encephalographic correlates. MD thesis, University of Warwick.

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Abstract

The distinction between state and trait dissociation informed the development and
psychometric validation of the State Scale of Dissociation (SSD) and the study of
concurrent electro-encephalographic (EEG) correlates of experimentally induced
dissociative states.
Existing scales measure trait dissociation. The need for a state scale was
addressed by the development and testing of a present-state, self-report measure.
Fifty-eight preliminary items were sorted into 7 subscales: derealisation,
depersonalisation, identity confusion, identity alteration, conversion, amnesia, and
hypermnesia. A revised 56-item SSD was administered with other psychiatric scales
(DES, BDI, BAI, SCI-PANSS) to patients with DSM-IV major depressive disorder
(n=19), schizophrenia (n=18), alcohol withdrawal (n=20), dissociative disorders
(n=10), and controls (n=63). The SSD was demonstrated to be a valid and reliable
measure of severity, and changes in severity, of dissociation at the time of its
completion. Discriminant validity, content, concurrent, predictive, internal criterionrelated,
internal construct, and convergent validities were confirmed statistically by
factor analysis, Spearman's rho correlations, confidence intervals, predictive analysis,
and parametric and non-parametric comparisons of dependent and independent
samples. It showed high internal consistency (Cronbach's alpha = 0.97) and high splithalf
reliability (Guttman coefficient = 0.92). The conversion subscale clustered with
the other subscales into one general factor on factor analysis and did not support its
segregation from dissociative disorders in DSM-IV.
State characteristics of dissociation were also examined in 11 patients with
complex partial epilepsy. The relationship between concurrent EEG and
experimentally induced dissociative states was examined by repeated SSD and
baseline DES measurements after spectral analysis of EEG. Canonical analysis
demonstrated significant SSD-EEG correlations. Amnesia, identity alteration, and
identity confusion correlated with theta, frontal delta, and fast wave EEG activity
respectively.
The SSD now allows for further investigation of the suggested state
continuum of severity and trait continuum of frequency of dissociation in more
comprehensive studies of concurrent neurobiological correlates.

Item Type:	Thesis (MD)
Subjects:	B Philosophy. Psychology. Religion > BF Psychology R Medicine > RC Internal medicine
Library of Congress Subject Headings (LCSH):	Dissociation (Psychology) -- Measurement, Dissociative disorders, Scaling (Social sciences)
Official Date:	October 1998
Dates:	Date Event October 1998 Submitted
Institution:	University of Warwick
Theses Department:	School of Postgraduate Medical Education
Thesis Type:	MD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Mace, Chris, 1956-
Extent:	384 p.
Language:	eng

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