# Novel Insights into Viewer-Centered Versus Stimulus-Centered Hemispatial Neglect: A Cross-Sectional Behavioral and Imaging Study of Acute Stroke

## TL;DR

This study finds that hemispatial neglect occurs after both left and right hemisphere strokes and is linked to specific brain lesions and hypoperfusion areas.

## Contribution

The study identifies distinct vascular territories and hypoperfusion areas associated with viewer-centered and stimulus-centered neglect after left and right hemisphere strokes.

## Key findings

- VCN is more common after right hemisphere stroke, while SCN occurs similarly after left and right hemisphere strokes.
- Lesion load and hypoperfusion in specific vascular territories predict different types of neglect.
- Adding hypoperfusion data improves the prediction of neglect types.

## Abstract

Background/Objectives: Hemispatial neglect is common after stroke but is often evaluated only after right hemisphere (RH) stroke. We sought to determine the prevalence of two types of neglect, viewer-centered neglect (VCN) and stimulus-centered neglect (SCN), after left hemisphere (LH) and RH strokes. Additionally, we identified lesion load in each vascular territory and areas of hypoperfusion, estimated with FLAIR hyperintense vessels (FVHs) that contribute to neglect. Methods: A series of 233 stroke patients (73 LH and 160 RH) were administered a task to detect VCN and SCN and received brain MRI within 5 days of onset. We used multivariable logistic regression to identify vascular territories where lesion load and/or hypoperfusion contributed to each type of neglect. Results: While VCN was more prevalent after RH stroke, SCN occurred at a similar rate after LH and RH stroke. In RH stroke, lesion load in the middle cerebral artery occipital region and anterior cerebral artery territory and age predicted left VCN, whereas parietal hypoperfusion independently predicted left SCN. In LH stroke, lesion load across regions and age predicted right VCN, while lesion load in posterior cerebral artery occipital and anterior cerebral artery regions, as well as age, predicted right SCN. The addition of information about hypoperfusion improved the prediction of both VCN and SCN. Conclusions: VCN and SCN are each common after RH stroke, and SCN is common after LH stroke. Each type of neglect is accounted for by distinct areas of infarct and hypoperfusion. Results will aid in the detection of neglect after stroke and may guide reperfusion interventions to improve neglect.