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The forgotten tract of vision in multiple sclerosis: vertical occipital fasciculus, its fiber properties, and visuospatial memory

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Abstract

Visual disturbances are a common disease manifestation in multiple sclerosis (MS) due to lesions damaging white matter tracts involved in vision. Vertical occipital fasciculus (VOF), a tract located vertically in the occipital lobe, was neglected for more than a century. We hypothesize that VOF is involved in integrating information between dorsal and ventral visual streams. Thus, its damage in MS, as well as its probable role in visual processing (by using MS as a VOF damage model) needs to be clarified. To study fiber characteristics of VOF in MS, and their clinical and visual learning associations, 57 relapsing–remitting MS (RRMS) and 25 healthy controls (HC) were recruited. We acquired MS Functional Composite, Expanded Disability Status Scale (EDSS), and Brief Visuospatial Memory Test-Revised (BVMT-R), and diffusion MRI scans. Tractography of VOF and optic radiation (OR) was done. VOF’s metrics were statistically tested for between-group differences and clinical and visual tests associations. Along-tract analysis and laterality were also tested. RRMS patients had higher mean, axial, and radial diffusivity (nearly in all fiber points), and lower fractional anisotropy in bilateral VOFs compared to HC. No laterality was noted. These were associated with poor clinical outcomes, poor visual scores in EDSS, and lower total immediate and delayed recall in BVMT-R in RRMS, after adjusting for age, gender, and fiber metrics of OR. VOF damage is present in RRMS and is associated with visual symptoms and visuospatial learning impairments. It seems VOF is involved in integrating information between visual streams.

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Availability of data and materials

To access the CRIMSON project data, please contact Dr. Arash Nazeri: arashnazeri[at]gmail[dot]com.

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The neuroimaging pipeline and statistical R codes are available upon request.

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Acknowledgements

We thank Dr. Franco Pestilli, Soichi Hayashi, Bradley Caron, and developers and contributors of the Brainlife.io platform, and Dr. Reza Rajimehr for his help due to his extensive knowledge and expertise in vision science. We also thank the main contributors of the CRIMSON project, including Dr. Arash Nazeri for providing the data, and Dr. Mohammad Ali Sahraian, the head of the Multiple Sclerosis Research Center, for helping us with scientific comments in conducting this research.

Funding

Brainlife.io is supported by NSF BCS-1734853, NSF BCS-1636893, NSF ACI-1916518, NSF IIS-1912270, and NIH NIBIB-R01EB029272. The CRIMSON project was funded by Tehran University of Medical Sciences and the Iranian MS Society, Tehran, Iran.

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Correspondence to AmirHussein Abdolalizadeh.

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The authors have no conflicts of interest to declare that are relevant to the content of this article.

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The CRIMSON project had ethics approval of the ethical review board of Tehran University of Medical Sciences, Tehran, Iran.

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Abdolalizadeh, A., Mohammadi, S. & Aarabi, M.H. The forgotten tract of vision in multiple sclerosis: vertical occipital fasciculus, its fiber properties, and visuospatial memory. Brain Struct Funct 227, 1479–1490 (2022). https://doi.org/10.1007/s00429-022-02464-3

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  • DOI: https://doi.org/10.1007/s00429-022-02464-3

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