October 2020
Volume 20, Issue 11
Open Access
Vision Sciences Society Annual Meeting Abstract  |   October 2020
Fixational Eye movements Act More Globally When Seeing Locally: A Motion-Integration Perspective
Author Affiliations & Notes
  • Yujie Wu
    Beijing Normal University
  • Mei Qiu
    Beijing Normal University
  • Dajun Xing
    Beijing Normal University
  • Footnotes
    Acknowledgements  This work was supported by National Key Basic Research Program of China 2014CB846100 and 2014CB846101, National Natural Science Foundation of China Grant (31371110), and the BNU Interdisciplinary Research Foundation for the First-Year Doctoral Candidates (BNUXKJC1909).
Journal of Vision October 2020, Vol.20, 717. doi:https://doi.org/10.1167/jov.20.11.717
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      Yujie Wu, Mei Qiu, Dajun Xing; Fixational Eye movements Act More Globally When Seeing Locally: A Motion-Integration Perspective. Journal of Vision 2020;20(11):717. doi: https://doi.org/10.1167/jov.20.11.717.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Fixational eye movements are assumed to be linked to visual perception. However, an increasing number of studies show dissociations between human perception and eye movements. Here we examined whether involuntary fixational eye movements, including microsaccades and intersaccadic drift, behave consistently with our perception when human and monkeys watch visual stimuli that elicit either coherent motion perception or incoherent motion perception. We recorded eye movements of human and monkeys in a fixation task while showing them three different motion patterns: pattern 1 is a diamond frame (8 degree for size, 0.5 degree for line width) rotating around a fixation point; pattern 2 is the same rotating frame with its corners covered by four black static occluders (0.1 cd/m2 for luminance, 4 degree for each occluder size); pattern 3 is a rotating frame also same as pattern 1 with its corners covered by four static occluders whose luminance are the same as background luminance (37.9 cd/m2). All human participants perceived motion pattern 1 and 2 as coherent motion, and perceived pattern 3 as incoherent motion (four line segments moving in two orthogonal trajectories). However, under all three conditions, participants showed similar circular traces of fixational eye movements which were consistent with circular trajectories of global motion. Similar to human participants, 4 monkeys showed circular eye movement traces for all three motion patterns. Furthermore, we found both directions of microsaccades and drift velocity showed periodic circular patterns consistent with global motion under three conditions. Our findings suggest that both microsaccades and drift in fixational eye movements reflect motion information in a global manner without awareness, which leads to a dissociation between fixational eye movements and perception in a motion-integration perspective.

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