JN Ad Instruments
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
 QUICK SEARCH:   [advanced]


     


J Neurophysiol (April 24, 2008). doi:10.1152/jn.90276.2008
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
100/4/1848    most recent
90276.2008v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Van Wetter, S. M.
Right arrow Articles by van Opstal, J. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Van Wetter, S. M.
Right arrow Articles by van Opstal, J. A.
Submitted on February 14, 2008
Revised on March 28, 2008
Accepted on April 20, 2008

Perisaccadic mislocalization of visual targets by head-free gaze shifts: visual or motor?

Sigrid MCI Van Wetter1 and John A. van Opstal2*

1 Radboud University Nijmegen
2 University of Nijmegen

* To whom correspondence should be addressed. E-mail: j.vanopstal{at}science.ru.nl.

Localization of a target flash is inaccurate when presented around the onset of a saccadic eye movement, and errors vary systematically with the target-saccade onset delay. We have recently shown that under head-fixed conditions these perisaccadic errors do not follow the quantitative predictions of current visuomotor updating models that explain these mislocalizations in terms of spatial updating. These models all assume sluggish eye-movement feedback, and predict that errors vary systematically with the amplitude and kinematics of the intervening saccade. Instead, we reported that errors depend only weakly on saccade amplitude. An alternative explanation is that around the saccade the perceived target location undergoes a uniform transient shift in the saccade direction, but that the oculomotor feedback is, on average, accurate. This 'visual shift' hypothesis predicts that errors will also remain insensitive to kinematic variability of much larger head-free gaze shifts. Here we test this prediction by presenting a brief visual probe near the onset of gaze saccades between 40 and 70 deg amplitude. According to models with inaccurate gaze-motor feedback, expected perisaccadic errors should be as large as 30 deg, and depend heavily on gaze-shift kinematics. In contrast, we found that the peak errors were similar to those of much smaller saccadic eye movements, i.e. about 10 deg, and that neither gaze-shift amplitude, nor kinematics plays a systematic role. Our data further corroborate the visual origin of perisaccadic mislocalization, and strengthen the idea that efferent feedback in the gaze control system is fast and accurate.




This article has been cited by other articles:


Home page
J. Neurosci.Home page
A. Richard, J. Churan, D. E. Guitton, and C. C. Pack
The Geometry of Perisaccadic Visual Perception
J. Neurosci., August 12, 2009; 29(32): 10160 - 10170.
[Abstract] [Full Text] [PDF]




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 2008 by the The American Physiological Society.