Abstract
The image on the retina is never stationary. Microscopic relocations of gaze, known as microsaccades, occur even during steady fixation. It has long been thought that microsaccades enable exploration of small regions in the scene in the same way saccades are normally used to scan larger regions. This hypothesis, however, has remained controversial, as it is believed that microsaccades are suppressed during fine spatial judgments. We examined the eye movements of human observers in a high-acuity visuomotor task, the threading of a needle in a computer-simulated virtual environment. Using a method for gaze-contingent display that enables accurate localization of the line of sight, we found that microsaccades precisely move the eye to nearby regions of interest and are dynamically modulated by the ongoing demands of the task. These results indicate that microsaccades are part of the oculomotor strategy by which the visual system acquires fine spatial detail.
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Acknowledgements
The authors thank A. Casile and D. Richters for helpful comments on the manuscript. This work was supported by a grant from the US National Institutes of Health (EY018363) and grants from the National Science Foundation (BCS-0719849 and IOS-0843304).
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H.-K.K. and M.P. collected data. M.R. supervised the experiments. All of the authors contributed to the design of the experiments, data analysis and the writing of the manuscript. The first two authors contributed equally to this work.
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Supplementary Text and Figures
Supplementary Figure 1 and Supplementary Results (PDF 94 kb)
Supplementary Video 1
Example of experimental trial. Reconstruction of the stimulus experienced by the subject during an experimental trial. The blue cross marks the position of the current location of gaze, which has been superimposed to the stimulus in order to show the eye movements performed by the observer. This cross was not displayed during the actual experiment. Intervals in which the cross turns red represent periods of blink. (MOV 838 kb)
Supplementary Video 2
Example of experimental trial. Reconstruction of the stimulus experienced by the subject during an experimental trial. The blue cross marks the position of the current location of gaze, which has been superimposed to the stimulus in order to show the eye movements performed by the observer. This cross was not displayed during the actual experiment. Intervals in which the cross turns red represent periods of blink. (MOV 844 kb)
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Ko, Hk., Poletti, M. & Rucci, M. Microsaccades precisely relocate gaze in a high visual acuity task. Nat Neurosci 13, 1549–1553 (2010). https://doi.org/10.1038/nn.2663
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DOI: https://doi.org/10.1038/nn.2663
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