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Published in: Neurological Sciences 4/2022

Open Access 01-04-2022 | Stroke | Review Article

Audio-visual stimulation for visual compensatory functions in stroke survivors with visual field defect: a systematic review

Authors: Kholoud Alwashmi, Georg Meyer, Fiona J. Rowe

Published in: Neurological Sciences | Issue 4/2022

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Abstract

Background

Hemianopia is a complete or partial blindness in the visual fields of both eyes, commonly caused by cerebral infarction. It has been hypothesized that systematic audio-visual (AV) stimulation of the blind hemifield can improve accuracy and search times, probably due to the stimulation of bimodal representations in the superior colliculus (SC), an important multisensory structure involved in both the initiation and execution of saccades.

Methods

A narrative synthesis of the findings is presented to highlight how AV rehabilitation impacts on patients with hemianopia including visual oculomotor function, functional ability in activities of daily living, hemianopic dyslexia, visual scanning and searching tasks, maintaining of functional ability post training and the effect on brain multisensory integration by using neuroimaging.

Results

Sixteen studies were included (fourteen articles (188 participants) and two literature reviews). Results were grouped into AV training of hemianopia in adults and in children and then further grouped according to the AV task type: tasks measuring the training effects by comparing visual stimulation training to audio-visual training, localization abilities in homonymous hemianopia (HH) and AV integration in patients with HH.

Conclusion

Systematic AV training may improve the processing of visual information by recruiting subcortical pathways, and because most of the patients with visual cortex damage have an intact SC, it might be useful to use the bimodal AV training to activate retinotectal functions. Nevertheless, the underlying mechanisms supporting the reported positive effects are not currently understood. Systematic functional and/or structural imaging studies may help in understanding the underlying mechanism and inform the design of optimal training paradigms.
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Literature
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Metadata
Title
Audio-visual stimulation for visual compensatory functions in stroke survivors with visual field defect: a systematic review
Authors
Kholoud Alwashmi
Georg Meyer
Fiona J. Rowe
Publication date
01-04-2022
Publisher
Springer International Publishing
Keyword
Stroke
Published in
Neurological Sciences / Issue 4/2022
Print ISSN: 1590-1874
Electronic ISSN: 1590-3478
DOI
https://doi.org/10.1007/s10072-022-05926-y

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