Suprathreshold processing of complex visual stimuli: evidence for linearity in contrast perception.
Magnitude estimation experiments show that perceived contrast for both sine and square waves is a linear function of stimulus contrast. The suprathreshold sine:square ratio required for equal perceived contrast derived from these data was verified by contrast matching experiments. These findings imply a high degree of linearity in suprathreshold visual processing of contrast.
D005556:Form Perception / Q000502:physiology*; D006801:Humans; D012684:Sensory Thresholds; D014795:Visual Pathways / Q000502:physiology*