Gaze-contingent display technology can help to reduce the ipsilesional attention bias in hemispatial neglect following stroke
DOI: 10.1186/s12984-022-01104-5
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Summary
This study investigates whether gaze-contingent display (GCD) technology can mitigate the ipsilesional attention bias in patients with left hemispatial neglect following right-hemisphere stroke. Hemispatial neglect is characterized by an impaired awareness of the contralesional space, driven by an imbalanced attentional priority map that overweights ipsilesional stimuli. The researchers hypothesized that dynamically reducing the visual salience of objects in the ipsilesional (right) hemispace via GCD could rebalance this map, thereby increasing exploration of the neglected left hemispace. The experiment involved 19 stroke patients with left neglect and 22 healthy controls. Participants viewed static naturalistic scenes under two task conditions: free viewing (FV), driven by bottom-up salience, and goal-directed visual search (VS), driven by top-down instructions. Eye-tracking recorded gaze positions while images were presented in four modification conditions: an original unmodified version, a static gradient reducing right-side saturation, and two GCD conditions (GC-LOW and GC-HIGH) that dynamically reduced contrast and saturation in the right hemispace relative to the current gaze position. Results indicated that patients exhibited a significant rightward shift in their median gaze position (Center of Fixation) in the original condition for both FV (6.8°) and VS (5.5°). GCD modifications significantly reduced this bias, particularly in FV, where GC-HIGH shifted the Center of Fixation by −3.2°. Furthermore, GCD increased the likelihood of patients initiating visual exploration in the neglected left hemifield by approximately 20% compared to the original condition. However, this alleviation of fixation bias did not translate into functional benefits; GCD did not improve the detection of targets in the left hemispace and actually decreased and slowed the detection of targets in the right hemispace. Subjectively, patients found the intervention pleasant, and most did not consciously notice the modifications. The study concludes that GCD technology can positively influence visual exploration patterns by counteracting the ipsilesional attention bias in neglect patients. Despite successfully redirecting gaze toward the neglected space, the intervention failed to enhance target detection, suggesting that shifting overt attention does not automatically restore functional awareness. The authors suggest that future research should explore individualized GCD applications, potentially integrated into augmented reality systems for daily living activities, to better assess clinical utility.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-18 |
| archive | success | canonical_url | — | — | 1 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-18 |
| chunk | success | chunk | — | — | 1 | 2026-06-18 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-18 |
| promote | success | — | — | — | 1 | 2026-06-18 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-18 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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