Microsaccades are triggered by low retinal image slip.

Proceedings of the National Academy of Sciences of the United States of America
Ralf Engbert, Konstantin Mergenthaler

Abstract

Even during visual fixation of a stationary target, our eyes perform rather erratic miniature movements, which represent a random walk. These "fixational" eye movements counteract perceptual fading, a consequence of fast adaptation of the retinal receptor systems to constant input. The most important contribution to fixational eye movements is produced by microsaccades; however, a specific function of microsaccades only recently has been found. Here we show that the occurrence of microsaccades is correlated with low retinal image slip approximately 200 ms before microsaccade onset. This result suggests that microsaccades are triggered dynamically, in contrast to the current view that microsaccades are randomly distributed in time characterized by their rate-of-occurrence of 1 to 2 per second. As a result of the dynamic triggering mechanism, individual microsaccade rate can be predicted by the fractal dimension of trajectories. Finally, we propose a minimal computational model for the dynamic triggering of microsaccades.

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Citations

Sep 5, 2006·Experimental Brain Research·Matteo ValsecchiMassimo Turatto
May 15, 2010·Experimental Brain Research·Konstantin Mergenthaler, Ralf Engbert
Mar 6, 2008·Psychological Research·Matteo Valsecchi, Massimo Turatto
Dec 11, 2008·Psychological Research·Reinhold KlieglRalf Engbert
Dec 28, 2010·Nature Neuroscience·Martin RolfsPatrick Cavanagh
Oct 10, 2008·Proceedings of the National Academy of Sciences of the United States of America·Xoana G TroncosoSusana Martinez-Conde
Aug 30, 2011·Proceedings of the National Academy of Sciences of the United States of America·Ralf EngbertArkady Pikovsky
Oct 27, 2011·The Quarterly Journal of Experimental Psychology : QJEP·Christiane Wotschack, Reinhold Kliegl
Mar 12, 2013·The Quarterly Journal of Experimental Psychology : QJEP·Elke B Lange, Ralf Engbert
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Mar 25, 2011·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Jorge Otero-MillanSusana Martinez-Conde
Oct 5, 2012·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Martin Rolfs, Marisa Carrasco
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