Midlevel Visual Deficits after Strokes Involving Area Human V4

ScreeningMaster.exe Program is written in C/C++ and is part of a proprietary framework developed in our lab that was used for stimulus generation under the name of 'SING' to generate a multitude of psychophysical stimuli for more than 20 years. The version downloaded contains the parameters specific tor the stimuli used in our present patient study. .cfg contains the configuration for the stimuli globally (detection or discrimination) and specifically for the setup of the stimuli: for luminance contrast detection/discrimination (=SETUP[Kontrast {QuadFormDots}]) for texture detection/discrimination (=SETUP[Orientierung {QuadFormTex}]) for motion detection/discrimination (=SETUP[Bewegungsrichtung {QuadFormMove}]) for colour detection/discrimination (=SETUP[Farbe (Farbwert) {QuadFormIshihara}]) .idv is the program to analyze the threshold of the staircase per quadrant. For more information consult the material and methods in the paper. psychophysics_rawdata_zenodo.xlsx: Psychophysical data of the complete dataset (patients and controls). 51 patients (category 1) are presented in the paper, this subgroup of the 128 patients. Patients were chosen based on the site of lesion according to the following criteria: unilateral lesion of the occipital and/or temporal and/or parietal cortex; lesion onset older than two months; no aphasia; no neglect (tested by three paper and pencil tests); no dementia; no visual field defects within the central 10 degrees in standard perimetry; no psychiatric or ophthalmological disorders. In addition, luminance contrast detection in the target quadrant had to be within normal limits. Controls (N=61) were included if they reported no neurological, psychiatric, or ophthalmological disturbances. All subjects had normal or corrected to normal visual acuity. For both conditions (localisation based on detection or else (form) discrimination) perceptual thresholds (62.5 % correct responses) were defined in each experimental run for each visual field quadrant using the adaptive staircase procedure QUEST (Quick Estimation by Sequential Testing; Watson & Pelli, 1983) yielding separate threshold values for each quadrant. After a short training with some clearly suprathreshold presentations the sequence of the four independent staircases was organized in randomized order within each experimental run. Subjects completed 30 trials per visual field quadrant, i.e. 120 trials per run. Each visual submodality (luminance, texture, motion, and colour) a