December 2022
Volume 22, Issue 14
Open Access
Vision Sciences Society Annual Meeting Abstract  |   December 2022
A trajectory aftereffect depending on the perceived trajectory of the double-drift illusion
Author Affiliations & Notes
  • Ryohei Nakayama
    The University of Tokyo
  • Mai Tanaka
    The University of Tokyo
  • Ikuya Murakami
    The University of Tokyo
  • Footnotes
    Acknowledgements  Supported by JSPS KAKENHI 21K13745 to RN and 18H05523 to IM
Journal of Vision December 2022, Vol.22, 3833. doi:
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      Ryohei Nakayama, Mai Tanaka, Ikuya Murakami; A trajectory aftereffect depending on the perceived trajectory of the double-drift illusion. Journal of Vision 2022;22(14):3833.

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

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It has been proposed that to determine the direction of object motion, the visual system can use the orientation information in motion trajectory that is available as visible persistence (Geisler, 1999). The present study dissociated the contributions of the physical and perceived trajectories by taking advantage of the double-drift illusion, in which the perceived trajectory of object motion over seconds is shifted in the direction of internal grating motion. In each trial, observers adapted for 5 s (or 35 s for the first trial in each block) to an array of Gabor patches each going up and down at 16.5 deg/s and reversing the direction every 0.5 s asynchronously to each other but synchronously with the directional reversal of its own carrier drifting horizontally at 5.5 deg/s. They appeared to be moving along tilted trajectories due to the double-drift illusion. To test a trajectory aftereffect, a luminance blob in motion at 11 deg/s was subsequently presented for 0.5 s and the subjective verticality of its trajectory was determined with the method of constant stimuli. Depending on the directional combination of the patch and carrier movements of the adaptors, and therefore depending on the direction of the double-drift illusion, the subjective verticality differed by 18.5˚ (SE = 1.0˚) when tested in the same hemifield as the adapted one and 7.1˚ (SE = 0.7˚) in the opposite hemifield. The difference was not accounted for by local motion adaptation to the internal grating motion per se because its direction was frequently reversed. This negative aftereffect also occurred to the same extent after adaptation to Gabor patches moving along physically tilted trajectories. The overall results suggest that in this instance, the perceptual, rather than physical, motion trajectories provide the spatial code for motion direction at the neural loci without hemifield specificity.


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