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J Neurophysiol (September 1, 2004). doi:10.1152/jn.00820.2004
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Submitted on August 11, 2004
Accepted on August 30, 2004

Modulation of Gaze-Evoked Blinks Depends Primarily on Extraretinal Factors

Shawn S. Williamson1, Ari Z. Zivotofsky1, and Michele A. Basso1*

1 Physiology, University of Wisconsin Madison, Madison, WI, USA

* To whom correspondence should be addressed. E-mail: michele{at}physiology.wisc.edu.

Gaze-evoked blinks are contractions of the orbicularis oculi (OO) - the lid closing muscle - occurring during rapid movements of the head and eyes and result from a common drive to the gaze and blink motor systems. However, blinks occurring during shifts of gaze are often suppressed when the gaze shift is made to an important visual stimulus, suggesting that the visual system can modulate the occurrence of these blinks. In head-stabilized, human subjects, we tested the hypothesis that the presence of a visual stimulus was sufficient, but not necessary, to modulate OOemg activity during saccadic eye movements. Rapid, reorienting movements of the eyes (saccades) were made to visual targets that remained illuminated (visually-guided trials) or were briefly flashed (memory-guided trials) at different amplitudes along the horizontal meridian. We measured OOemg activity and found that the magnitude and probability of OOemg activity occurrence was reduced when a saccade was made to the memory of the spatial location as well as to the actual visual stimulus. The reduced OOemg activity occurred only when the location of the target was previously cued. OOemg activity occurred reliably with spontaneous saccades that were made to locations with no explicit visual stimulus, generally, back to the fixation location. Thus, the modulation of gaze-evoked OOemg activity does not depend upon the presence of visual information per se, but rather, results from an extraretinal signal.







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