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Experimental and calibration stimuli. (a) Viewing arrangement. Fixation cross (+), eccentricity in deg (ecc), width and height (x, y). (b) The temporal display sequence, showing the on-ramp, steady display, and off-ramp of the moving grating; each component is one full period (4 frames). (c) Five frames of a moving grating. (d) Five frames of the calibration display. Frames 2 and 4 are luminance amplifier frames.
