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The Effects of Compensatory Scanning Training on Mobility in Patients with Homonymous Visual Field Defects: A Randomized Controlled Trial

Homonymous visual field defects (HVFD) are a common consequence of postchiasmatic acquired brain injury and often lead to mobility-related difficulties. Different types of compensatory scanning training have been developed, aimed at decreasing consequences of the HVFD by changing visual scanning. Th...

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Published in:PloS one 2015-08, Vol.10 (8), p.e0134459-e0134459
Main Authors: de Haan, Gera A, Melis-Dankers, Bart J M, Brouwer, Wiebo H, Tucha, Oliver, Heutink, Joost
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Melis-Dankers, Bart J M
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description Homonymous visual field defects (HVFD) are a common consequence of postchiasmatic acquired brain injury and often lead to mobility-related difficulties. Different types of compensatory scanning training have been developed, aimed at decreasing consequences of the HVFD by changing visual scanning. The aim of the present study is to examine the effects of a compensatory scanning training program using horizontal scanning on mobility-related activities and participation in daily life. The main interest of this study is to assess the effectiveness of training on mobility-related activities and participation in daily life. Visual scanning tests, such as dot counting and visual search, and control measures for visual functions and reading have been included as well. First, it is examined how performance on scanning and mobility-related measures is affected in patients with HVFD by comparing scores with scores of a healthy control group (n = 25). Second, the effect of training is assessed using an RCT design, in which performance of 26 patients before and after training is compared to performance of 23 patients in a waiting list control group. Self-reported improvements after training were found, accompanied by improvements in detecting peripheral stimuli and avoiding obstacles during walking, especially in dual task situations in which a second task limits the attentional capacity available for compensatory scanning. Training only improved mobility-related activities in which detection of peripheral stimuli is important, while no improvement was found on tests that require other visual skills, such as reading, visual counting and visual search. This is the first RCT to evaluate the effects of a compensatory scanning training that is based on a systematic horizontal scanning rhythm. This training improved mobility-related activities. The results suggest that different types of compensatory scanning strategies are appropriate for different types of activities. ISRCTN Registry ISRCTN16833414.
doi_str_mv 10.1371/journal.pone.0134459
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subjects Activities of Daily Living
Adult
Aged
Brain
Brain damage
Brain injury
Brain research
Clinical trials
Defects
Female
Head injuries
Hemianopsia - etiology
Hemianopsia - physiopathology
Hemianopsia - rehabilitation
Humans
Male
Middle Aged
Mobility
Neuropsychology
Patients
Psychomotor Performance - physiology
Questionnaires
Reading
Registration
Scanning
Self Report
Stimuli
Studies
Training
Traumatic brain injury
Treatment Outcome
Visual field
Visual fields
Visual perception
title The Effects of Compensatory Scanning Training on Mobility in Patients with Homonymous Visual Field Defects: A Randomized Controlled Trial
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