Improved visual sensitivity during smooth pursuit eye movements

Abstract

When we view the world around us, we constantly move our eyes. This brings objects of interest into the fovea and keeps them there, but visual sensitivity has been shown to deteriorate while the eyes are moving. Here we show that human sensitivity for some visual stimuli is improved during smooth pursuit eye movements. Detection thresholds for briefly flashed, colored stimuli were 16% lower during pursuit than during fixation. Similarly, detection thresholds for luminance-defined stimuli of high spatial frequency were lowered. These findings suggest that the pursuit-induced sensitivity increase may have its neuronal origin in the parvocellular retino-thalamic system. This implies that the visual system not only uses feedback connections to improve processing for locations and objects being attended to, but that a whole processing subsystem can be boosted. During pursuit, facilitation of the parvocellular system may reduce motion blur for stationary objects and increase sensitivity to speed changes of the tracked object.

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Figure 1: Experimental protocol.
Figure 2: Contrast thresholds during pursuit and fixation for red-green color and luminance stimuli.
Figure 3: Influence of spatial location and stimulus type.
Figure 4: Influence of temporal and spatial integration.
Figure 5: Influence of pursuit velocity.
Figure 6: Dynamics of the enhancement.

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Acknowledgements

We thank M. Hawken and M. Spering for comments and suggestions, U. Kleinholderman and W. Kirchner for technical assistance and S. Bader, M. Höfer and E. Baumgartner for help with data collection. This work was supported by the German Research Foundation Forschergruppe “Perception and Action” and the German Research Foundation Graduiertenkolleg “NeuroAct”.

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Correspondence to Karl R Gegenfurtner.

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Schütz, A., Braun, D., Kerzel, D. et al. Improved visual sensitivity during smooth pursuit eye movements. Nat Neurosci 11, 1211–1216 (2008). https://doi.org/10.1038/nn.2194

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