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The Cortical Hyperexcitability Index (CHi) : a new measure for quantifying correlates of visually driven cortical hyperexcitability

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Braithwaite, Jason J., Marchant, Rachel, Takahashi, Chie, Dewe, Hayley and Watson, Derrick G. (2015) The Cortical Hyperexcitability Index (CHi) : a new measure for quantifying correlates of visually driven cortical hyperexcitability. Cognitive Neuropsychiatry, 20 (4). doi:10.1080/13546805.2015.1040152

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Official URL: http://doi.org/10.1080/13546805.2015.1040152

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Abstract

Introduction:
Aberrations of visual experience, including visual hallucinations and visual distortions are known to be associated with increased cortical hyperexcitability. As a consequence, the presence, intensity and frequency of certain experiences may well be indicative of an
underlying increase in cortical hyperexcitability.

Method:
The current study presents a new proxy measure of cortical hyperexcitability, the Cortical Hyperexcitability Index (CHi). Two-hundred and fifty healthy participants completed the CHi with the results subjected to Exploratory Factor Analysis (EFA).

Results:
The EFA revealed a 3-factor model as the most parsimonious solution. The 3 factors were defined as; (i) heightened visual sensitivity and discomfort; (ii) negative aura-type visual aberrations; and, (iii) positive aura-type visual aberrations. The identification of 3-factors suggests that multiple mechanisms underlie the notion of cortical hyperexcitability, providing researchers with new and greater precision in delineating these underlying features.

Conclusion:
The factorial structure of the CHi, and the increased precision could aid the interpretation of findings from neuroscientific (i.e., brain-imaging / stimulation) examinations of cortical processes underlying aberrant perceptions across a host of clinical, neurological, and pathological conditions. As a consequence, the CHi is a useful and comprehensive proxy measure of cortical hyperexcitability with considerable scientific and clinical utility.

Item Type: Journal Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science, Engineering and Medicine > Science > Psychology
Library of Congress Subject Headings (LCSH): Hallucinations and illusions
Journal or Publication Title: Cognitive Neuropsychiatry
Publisher: Psychology Press
ISSN: 1354-6805
Official Date: 28 May 2015
Dates:
DateEvent
28 May 2015Published
6 April 2015Accepted
17 December 2014Submitted
Volume: 20
Number: 4
DOI: 10.1080/13546805.2015.1040152
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Leverhulme Trust (LT)
Grant number: RPG-2012-500 (LT)
Adapted As:

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