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(Stroke. 2007;38:3172.)
© 2007 American Heart Association, Inc.

Original Contributions

Incidence of Visual Extinction After Left Versus Right Hemisphere Stroke

From Section Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.

Correspondence to Prof Hans-Otto Karnath, MD, PhD, Center of Neurology, University of Tübingen, Hoppe-Seyler-Str.3, D-72076 Tübingen, Germany. E-mail Karnath{at}uni-tuebingen.de

Background and Purpose— Generally it is accepted that spatial neglect occurs predominantly after stroke of the human right hemisphere. In contrast, it remained controversial whether extinction follows the same hemispheric asymmetry. The opinion prevails that the laterality of visual extinction is not as pronounced as it is for spatial neglect.

Methods— To directly compare the incidence of the 2 disorders within the same sample, spatial neglect and visual extinction were investigated during a 1-year period in 83 consecutively admitted patients with unilateral right or left hemisphere stroke.

Results— The incidence of visual extinction and of spatial neglect was not significantly different, neither after left hemisphere (2.4% neglect; 4.9% extinction) nor after right hemisphere (26.2% neglect; 24.3% extinction) stroke.

Conclusions— Visual extinction seems to be as asymmetrically associated with the human right hemisphere as is spatial neglect.

Key Words: brain damage • clinical neurology • cognitive impairment • human • neuropsychology • spatial neglect • visual extinction