Spatial frequency range in the detection process--2. Wide bars and sharp edge.
The effect upon the detectability of broad bars and a sharp edge of ideal low- and high-pass filters was investigated. The results indicate that, for optimum detection of the stimulus, spatial frequency components up to about 5 c deg-1 need to be transmitted. Two models (a multi-channel model, incorporating probability summation across spatial frequency, and a Grating Sensitivity Curve model) were used in attempting to fit the results. The multi-channel model provided a more realistic fit, but both models ultimately failed because of non-linearity in the summation of responses to frequency components.
D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D008959:Models, Neurological; D010364:Pattern Recognition, Visual / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D014792:Visual Acuity