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      Panoramic Uncertainty in Vertical Perception

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      Creators
      Stapel, J.C.
      Medendorp, W.P.
      Date of Archiving
      2021
      Archive
      Radboud Data Repository
      DOI
      https://doi.orghttps://doi.org/10.34973/kbzc-ng08
      Related publications
      Panoramic uncertainty in vertical perception  
      Publication type
      Dataset
      Access level
      Open access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/239484   https://hdl.handle.net/2066/239484
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      Organization
      SW OZ DCC SMN
      Audience(s)
      Kinesiology
      Languages used
      English
      Key words
      Subjective Visual Vertical; Bayesian; Vision
      Abstract
      Judgments of the orientation of a visual line with respect to Earth vertical are affected by panoramic visual cues. This is illustrated by the rod-and-frame effect (RFE), the finding that the perceived orientation of a luminous rod is biased by the orientation of a surrounding squared frame. In this study, we tested how the uncertainty of frame orientation affects the RFE by asking upright or tilted participants to psychometrically judge the orientation of a briefly flashed rod contained within either a circular frame, a squared frame, or either of two intermediate frame forms, called squircles, presented in various orientations. Results showed a cyclical modulation of frame-induced bias across the range of the square and squircular frame orientations. The magnitude of this bias increased with increasing squaredness of the frame, as if the more unequivocal the orientation cues of the frame, the larger the reliance on them for rod orientation judgments. These findings are explained with a Bayesian optimal integration model in which participants flexibly weigh visual panoramic cues, depending on their orientation reliability, and non-visual cues in the perception of vertical.
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      • Faculty of Social Sciences [28417]
       
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