September 2024
Volume 24, Issue 10
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2024
Object correspondence across movements at saccadic speed
Author Affiliations & Notes
  • Melis Ince
    Department of Psychology, Humboldt-Universität zu Berlin, Germany
    Berlin School of Mind and Brain, Humboldt-Universität zu Berlin, Germany
  • Carolin Hübner
    Department of Psychology, Humboldt-Universität zu Berlin, Germany
    Department of Psychology, Technische Universität Chemnitz, Germany
  • Martin Rolfs
    Department of Psychology, Humboldt-Universität zu Berlin, Germany
    Berlin School of Mind and Brain, Humboldt-Universität zu Berlin, Germany
  • Footnotes
    Acknowledgements  Funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. [865715 – VIS-A-VIS]) and the Heisenberg Programme of the Deutsche Forschungsgemeinschaft (grants RO3579/8-1 and RO3579/12-1) granted to MR.
Journal of Vision September 2024, Vol.24, 1177. doi:https://doi.org/10.1167/jov.24.10.1177
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      Melis Ince, Carolin Hübner, Martin Rolfs; Object correspondence across movements at saccadic speed. Journal of Vision 2024;24(10):1177. https://doi.org/10.1167/jov.24.10.1177.

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

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Abstract

Saccadic eye movements impose rapid motion on the retinal image, raising the question of how object correspondence is established from one fixation to the next. Here, we investigated if the rapid motion itself — by providing spatiotemporal continuity — plays a role in achieving object correspondence. To isolate the contribution of high-speed motion, we simulated saccadic motion using a high-temporal-resolution projector (updating the display every 0.69 ms) while observers fixated their gaze throughout the experiments. We first investigated the contribution of motion at saccadic speed to object correspondence using a two-frame quartet-motion display. We positioned identical Gabor patches as objects at opposing corners within an imaginary rectangle. One object then moved continuously — along a curved trajectory (inward or outward) — to one of the neighboring corners, while the other jumped to the opposite side, completing the quartet. On each trial, participants first reported quartet rotations (clockwise or counterclockwise), indicating perceived object correspondence, and then traced the perceived continuous motion trajectory using a mouse, indicating motion visibility (location and curvature). We found that motion visibility declined as speed increased, eventually reaching chance levels for location and curvature reports. At the same time, continuous motion biased the quartet rotation perception even at the highest (saccade-like) speeds. These results suggest that high-speed motion informs object correspondence, even if that motion is effectively invisible. We are currently following up on this finding in a second study, in which we combine a version of our quartet motion display with the go/no-go reviewing paradigm (Sasi et al., 2023). We investigate if object files are maintained through motion at saccadic speed. By combining objective measures of stimulus visibility, the perception of object correspondence, and the maintenance of object files over time, we aim to shed light on the fundamental mechanisms behind object continuity at saccadic speeds.

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