Gaze-contingent display technology can help to reduce the ipsilesional attention bias in hemispatial neglect following stroke

Autor: Lisa Kunkel genannt Bode, Anna Sophie Schulte, Björn Hauptmann, Thomas F. Münte, Andreas Sprenger, Björn Machner
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of NeuroEngineering and Rehabilitation, Vol 19, Iss 1, Pp 1-15 (2022)
Druh dokumentu: article
ISSN: 1743-0003
DOI: 10.1186/s12984-022-01104-5
Popis: Abstract Background Hemispatial neglect results from unilateral brain damage and represents a disabling unawareness for objects in the hemispace opposite the brain lesion (contralesional). The patients’ attentional bias for ipsilesional hemispace represents a hallmark of neglect, which results from an imbalanced attentional priority map in the brain. The aim of this study was to investigate whether gaze-contingent display (GCD) technology, reducing the visual salience of objects in ipsilesional hemispace, is able to rebalance this map and increase awareness and exploration of objects in the neglected contralesional hemispace. Methods Using remote eye-tracking, we recorded gaze positions in 19 patients with left hemispatial neglect following right-hemisphere stroke and 22 healthy control subjects, while they were watching static naturalistic scenes. There were two task conditions, free viewing (FV) or goal-directed visual search (VS), and four modification conditions including the unmodified original picture, a purely static modification and two differently strong modifications with an additional gaze-contingent mask (GC-LOW, GC-HIGH), that continuously reduced color saturation and contrast of objects in the right hemispace. Results The patients’ median gaze position (Center of Fixation) in the original pictures was markedly deviated to the right in both tasks (FV: 6.8° ± 0.8; VS: 5.5° ± 0.7), reflecting the neglect-typical ipsilesional attention bias. GC modification significantly reduced this bias in FV (GC-HIGH: d = − 3.2 ± 0.4°; p
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