Fig. 4: The psychophysical threshold, computed as the 50% just noticeable difference between the comparison and reference stimuli of all finger types of both hands. The experiment was performed for sinusoidal and square virtual gratings. The finger types are as follow: (1) thumb, (2) index, (3)middle, (4) ring, (5) little. The boxplots show the median value and the error bars show the interquartile range.
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