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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
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 > 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: |
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| 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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