Altered white matter connectivity associated with visual hallucinations following occipital stroke

Simple item page
dc.contributor.authorRafique, Sara
dc.contributor.authorRichards, John R.
dc.contributor.authorSteeves, Jennifer
dc.date.accessioned2020-03-09T20:57:50Z
dc.date.available2020-03-09T20:57:50Z
dc.date.issued2018-05-21
dc.description.abstractIntroduction: Visual hallucinations that arise following vision loss stem from aberrant functional activity in visual cortices and an imbalance of activity across associated cortical and subcortical networks subsequent to visual pathway damage. We sought to determine if structural changes in white matter connectivity play a role in cases of chronic visual hallucinations associated with visual cortical damage. Methods: We performed diffusion tensor imaging (DTI) and probabilistic fiber tractography to assess white matter connectivity in a patient suffering from continuous and disruptive phosphene (simple) visual hallucinations for more than 2 years following right occipital stroke. We compared these data to that of healthy age-matched controls. Results: Probabilistic tractography to reconstruct white matter tracts suggests regeneration of terminal fibers of the ipsilesional optic radiations in the patient. However, arrangement of the converse reconstruction of these tracts, which were seeded from the ipsilesional visual cortex to the intrahemispheric lateral geniculate body, remained disrupted. We further observed compromised structural characteristics, and changes in diffusion (measured using diffusion tensor indices) of white matter tracts in the patient connecting the visual cortex with frontal and temporal regions, and also in interhemispheric connectivity between visual cortices. Conclusions: Cortical remapping and the disruption of communication between visual cortices and remote regions are consistent with our previous functional magnetic resonance imaging (fMRI) data showing imbalanced functional activity of the same regions in this patient (Rafique et al, 2016, Neurology, 87, 1493–1500). Long-term adaptive and disruptive changes in white matter connectivity may account for the rare nature of cases presenting with chronic and continuous visual hallucinations.en_US
dc.description.sponsorshipYork University Librariesen_US
dc.identifier.citationBrain and Behavior 8 (2018): e01010.en_US
dc.identifier.urihttps://doi.org/10.1002/brb3.1010en_US
dc.identifier.urihttps://hdl.handle.net/10315/37083
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rightsAttribution 2.5 Canada*
dc.rights.articlehttps://onlinelibrary.wiley.com/doi/full/10.1002/brb3.1010en_US
dc.rights.journalhttps://onlinelibrary.wiley.com/journal/21579032en_US
dc.rights.publisherhttps://onlinelibrary.wiley.com/en_US
dc.rights.urihttp://creativecommons.org/licenses/by/2.5/ca/*
dc.subjectdiffusion tensor imagingen_US
dc.subjectmagnetic resonance imagingen_US
dc.subjectstrokeen_US
dc.subjectvision lossen_US
dc.subjectvisual hallucinationsen_US
dc.subjectwhite matteren_US
dc.titleAltered white matter connectivity associated with visual hallucinations following occipital strokeen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Rafique_et_al-2018-Brain_and_Behavior.pdf
Size:
1.07 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.83 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Department of Psychology
York University Libraries' Open Access Author Fund

All items in the YorkSpace institutional repository are protected by copyright, with all rights reserved except where explicitly noted.