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(A) Example stimuli showing oriented Gabor-gratings embedded in pixel noise at decreasing luminance contrast (100%, 50%, 15%, 5%). (B) Example of one staircase measurement in patient P1. The staircase protocol was based on a modified version of the PEST (Parameter Estimation by Sequential Testing) procedure. The last contrast-value (arrow) was taken as the measure of the contrast-threshold of a given staircase run.
