Direction discrimination for band-pass filtered random dot kinematograms.

摘要: Abstract When an array of random dots is displaced, the ability to report direction apparent motion subject upper spatial limit ( d max ). As size displacement increased, discrimination errors show a monotonie increase that becomes asymptotic at chance level. We have measured using spatially band-pass filtered dots. These stimuli do not yield in errors. Rather, for displacements greater than around 1 cycle stimulus centre frequency F c ), performance oscillates about chance, with 1/14 cycles yielding systematic perceived direction. analyse this pattern terms autocorrelation function and conclude can be taken as lying on initial rising portion versus error function. Using definition we find, Une results Chang Julesz (1985) , scales inversely . Contrary Julesz, find scaling holds beyond 4 c/deg.