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NEUROLOGY 2004;62:1333-1337
© 2004 American Academy of Neurology

Attentional bias induced by viewing actual or illusory movements

Y. Jeong, MD, B. H. Lee, MA, H. J. Ahn, BA, K. C. Park, MD, K. M. Heilman, MD and D. L. Na, MD

From the Department of Neurology (Drs. Jeong, Park, and Na, B.H. Lee and H.J. Ahn), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; and Department of Neurology (Dr. Heilman), College of Medicine, University of Florida and Veterans Affairs Medical Center, Gainesville, FL.

Address correspondence and reprint requests to Dr. Duk L. Na, Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Ilwon-dong Kangnam-ku, Seoul, 135-710 Korea; e-mail: dukna{at}smc.samsung.co.kr

Objective: To learn to which portions of a line normal subjects would attend when watching this line actually moving or when perceiving movement even in the absence of actual movement, an illusory movement.

Methods: Twenty normal subjects watched a computer monitor on which either lines or dots moved to the right or left. They also watched stationary lines, which appeared to be moving to the left or right because the background was moving in the opposite direction. While watching these lines or dots, their eye movements were monitored to determine the position of fixation.

Results: Overall, subjects fixated on the side of the line that was in the direction of real or illusory movement. In the actual movement condition, leftward motion induced more of an attentional bias than rightward motion. In the illusory movement condition, however, rightward illusory movement condition induced more of an attentional bias than leftward movement.

Conclusions: Objects moving leftward or rightward primarily activate the contralateral hemisphere. This hemispheric activation may induce a contralateral overt orienting response that is reflected by eccentric eye fixation. Treatments of neglect, such as caloric vestibular stimulation, may alter an attentional bias by inducing the illusion of movement.

Received July 16, 2003. Accepted in final form November 24, 2003.




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