Measurement and modeling of peripheral detection and discrimination thresholds.
This report describes experimental measurements of threshold contrasts as a function of the angle to the visual axis (peripheral threshold contrasts). The visual tasks consist in detection (perception of presence) and discrimination (perception of a form feature) of simple visual signs during a fixation period realistic observing conditions being chosen. Proceeding from the experimental findings a model for forecasting off-axis threshold contrast functions on different visual conditions is developed based upon spatial frequency filters. Further with the aid of a known model visibility fields are calculated.
Fleck
H J
HJ
Bavariaring 4, München, Federal Republic of Germany.
D004192:Discrimination, Psychological / Q000502:physiology*; D005584:Fovea Centralis / Q000502:physiology; D006801:Humans; D008433:Mathematics; D008954:Models, Biological; D014794:Visual Fields; D014796:Visual Perception / Q000502:physiology*