Jan W Kurzawski, Maria Pombo, Augustin Burchell, Nina M Hanning, Simon Liao, Najib J Majaj, Denis G Pelli
Online methods allow testing of larger, more diverse populations, with much less effort than in-lab testing. However, many psychophysical measurements, including visual crowding, require accurate eye fixation, which is classically achieved by testing only experienced observers who have learned to fixate reliably, or by using a gaze tracker to restrict testing to moments when fixation is accurate. Alas, both approaches are impractical online as online observers tend to be inexperienced, and online gaze tracking, using the built-in webcam, has a low precision (±4 deg)...
2023: Frontiers in Human Neuroscience