The harmonic bandwidth of phase-reversal discrimination.
Previous studies have shown that 180 degrees relative phase shifts in f + 2f gratings are discriminated when the cosine or the sine component of the shift exceeds some criterion (Bennett & Banks, 1987; Field & Nachmias, 1984). The current experiments demonstrate that this result holds for other two-component gratings, provided that the components are within two to three octaves of each other. For frequency differences greater than two to three octaves, phase-reversal discrimination is impossible. A simple model that discriminates phase shifts on the basis of changes in the responses of even- and odd-symmetric spatial filters can account for the results.
Bennett
P J
PJ
Department of Psychology, University of Toronto, ON, Canada.
D015350:Contrast Sensitivity; D004193:Discrimination Learning; D006801:Humans; D009949:Orientation; D010364:Pattern Recognition, Visual; D011601:Psychophysics; D012684:Sensory Thresholds; D013028:Space Perception