Effective contrast constancy and linearity of contrast sensation

Experiments In Texture Perception

“…Although this assumption regarding the behavior of the visual system is known to be false , particularly at high contrasts (Davidson , 1968;Cornsweet , 1970;Franzen and Berkley , 1975), the approximation is good at low contrasts (Campbell and Robsom , 1968;Henning et al, 1975;Abadi and Kulikowski , 1973;Kulikowski , 1976 ;Quick and Reichart , 1975;Graham, 1977). With this approximation it is then necessary only to specify an equivalence between each pure sine-wave pattern and the chosen fixed spatial frequencies (primaries ) in order to specify matches to all possible textures.…”

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“…Only at spatial frequencies near 12 cycles/degree does the slope approximate 1.0, in accord with a perfect Weber's law characteristic. Although the causes of these slope differences are not presently known, it has been suggested that for spatial frequencies below 3 cycles/degree, the decrease in slope might be, in part, a consequence of transient mechanisms that are excited under the experimental conditions used to perform the experiments [16].…”

Visual Processing of Object Velocity and Acceleration

“…change in the filter response, while the right half of the steeper slopes are reported for high-frequency bandfigure shows the positional shift that produces the same limited targets (Kulikowski, 1976; Kulikowski and Gorea, change in the filter response. Suppose that the two 1978; Wilson, 1991).…”