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Visual-spatial neglect after right-hemisphere stroke: behavioral and electrophysiological evidence
Lin-Lin Ye1, Lei Cao, Huan-Xin Xie
1Department of Rehabilitation, Xuanwu Hospital, Capital Medical University, Beijing 100053, China.
Chinese Medical Journal
|March 27, 2019
Summary
Right-hemisphere stroke impairs visual-spatial attention, even in patients without overt neglect. Event-related potential (ERP) findings reveal neurophysiological differences, highlighting the need for clinical awareness of subclinical visual-spatial neglect (VSN).
Area of Science:
- Neuroscience
- Neuropsychology
- Clinical Neurology
Background:
- Visual-spatial neglect (VSN) is a common neuropsychological deficit following right-hemisphere stroke.
- The underlying pathogenetic mechanisms of VSN remain incompletely understood.
- Investigating behavioral and neurophysiological changes is crucial for understanding VSN.
Purpose of the Study:
- To examine behavioral and event-related potential (ERP) alterations in right-hemisphere stroke patients with and without VSN.
- To elucidate the neurophysiological underpinnings of VSN.
- To identify potential markers for subclinical VSN.
Main Methods:
- Recruited three groups: 11 patients with VSN (right-hemisphere stroke), 11 patients without VSN (right-hemisphere stroke), and 11 healthy controls.
- Assessed visual-spatial function using standardized behavioral tests.
- Conducted event-related potential (ERP) examinations to measure neural responses.
Main Results:
- Patients with VSN and non-VSN showed prolonged response times compared to controls.
- VSN patients exhibited lower accuracy on left-sided stimuli compared to non-VSN patients and controls.
- ERP analysis revealed altered P1 latency, N1 amplitude, and P300 amplitude in VSN patients, suggesting impaired visual processing and attention.
Conclusions:
- Right-hemisphere stroke significantly impairs visual-spatial attention function.
- Subclinical VSN is prevalent and warrants clinical attention.
- Findings provide neurophysiological evidence supporting the lateralization of VSN mechanisms.
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