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Motion sensitivity during fixation in straight-ahead and lateral eccentric gaze

Abstract

Despite motion of the entire retinal image that results from fixational eye-movements, the visual scene is perceived as stationary. One hypothesis to account for this observation is that normal motion sensitivity is limited by the variability of fixational eye velocity. The present experiments tested this hypothesis by comparing motion sensitivity and the variability of fixational eye velocity in corresponding meridians. Speed thresholds to detect horizontal, vertical, and rotary motion in a set of eight random-dot patches were measured, while normal observers monocularly viewed the stimulus with gaze either straight-ahead or deviated to the left by 45°. Eye-movement recordings using the search-coil technique were used to estimate the variability of eye velocity in the horizontal, vertical, and torsional meridians during fixation. As reported previously by Murakami (2004), the averaged thresholds for horizontal and vertical motion correlated with the averaged variability of eye velocity in the horizontal and vertical meridians when observers looked straight-ahead. However, no relationship existed between the threshold for rotary motion and the variability of eye velocity in the torsional meridian. Furthermore, no relationship existed between the motion threshold and the variability of eye velocity in any meridian during fixation in lateral eccentric gaze. These results are only partly consistent with the hypothesis that fixation variability limits motion sensitivity.

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Notes

  1. When the sampling window for eye velocity was reduced from 500 to 20 ms, the correlation between the average thresholds to detect horizontal and vertical motion and the average SDs of horizontal and vertical eye velocity also showed no improvement during fixation at 45° eccentric gaze (= 0.006).

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Acknowledgments

We thank the experimental observers who participated in this study for their tolerance and dedication. We also thank Dr. Saumil S. Patel for helpful discussions and for assistance in preparing the experimental stimuli. This research was supported in part by research grant, R01 EY05086, short-term training grant, T35 EY07088, and Core Center award, P30 EY07751 from the National Eye Institute. Portions of the results were presented at the 2005 and 2006 meetings of the Vision Sciences Society, Sarasota, FL.

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Correspondence to Harold E. Bedell.

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Tong, J., Lien, T.C., Cisarik, P.M. et al. Motion sensitivity during fixation in straight-ahead and lateral eccentric gaze. Exp Brain Res 190, 189–200 (2008). https://doi.org/10.1007/s00221-008-1462-1

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  • DOI: https://doi.org/10.1007/s00221-008-1462-1

Keywords

  • Motion sensitivity
  • Eye-movement
  • Fixation
  • Space constancy