Phase reversal discrimination.
In the Fourier representation of space, the parameter of phase plays a crucial role. In this study, several experiments were performed involving discrimination of various phase relations of fundamental (2 c/deg) to second harmonic (4 c/deg) at low contrast levels. The results were consistent with a model involving four "channels", each optimally sensitive to one of the following phase relations: + cosine (bright bar), -cosine (dark bar), +sine (left edge), and -sine (right edge).
D005583:Fourier Analysis; D006801:Humans; D008027:Light; D008954:Models, Biological; D012684:Sensory Thresholds; D013028:Space Perception / Q000502:physiology*