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Velocity discrimination thresholds of schizophrenic patients, their first-degree relatives, and normal controls. The abscissa represents the range of base velocities tested in this experiment. The ordinate, expressed as the Weber fraction (ΔV/V, or the just-noticeable differences between the velocities of the targets to be compared), represents the velocity discrimination threshold values of the three groups. The error bars correspond to ±1 standard error of the mean threshold.
