Imagining circles – Empirical data and a perceptual model for the arc-size illusion

@article{Schmidtmann2016ImaginingC,
  title={Imagining circles – Empirical data and a perceptual model for the arc-size illusion},
  author={Gunnar Schmidtmann and Marouane Ouhnana and Gunter Loffler and Frederick A. A. Kingdom},
  journal={Vision Research},
  year={2016},
  volume={121},
  pages={50-56}
}
An essential part of visual object recognition is the evaluation of the curvature of both an object's outline as well as the contours on its surface. We studied a striking illusion of visual curvature--the arc-size illusion (ASI)--to gain insight into the visual coding of curvature. In the ASI, short arcs are perceived as flatter (less curved) compared to longer arcs of the same radius. We investigated if and how the ASI depends on (i) the physical size of the stimulus and (ii) on the length of… CONTINUE READING