Independent coding across spatial scales in moving fractal images

摘要: Abstract We compared observers' ability to discriminate the direction of apparent motion using images which varied in their spatial characteristics; white or flat spectrum noise, and 1/f noise has an amplitude characteristic natural scenes. The upper limit for discrimination (dmax) was measured a two-flash random dot kinematogram (RDK), consisted either pair bandpass filtered image its broadband counterpart. Six central frequencies were used, ranging from 0.25 5.66 cyc/deg. Subjects could perform task all six both bandpass-bandpass bandpass-broadband sequences images, dmax values found be approximately equal these two conditions at scales. However, not possible lowest task. These data show that information wide range scales is equally salient human system whose spectra fall as 1/f. higher more dominates performance results are consistent with model frequency filters input lines detectors have octave constant bandwidths peak sensitivity. In line number recent studies, this suggests properties sensitive cells matched statistical