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Scatter plots for the aperture closure distance as a function of the amplitude of aperture (a, d), the wrist velocity (b, e), and wrist acceleration (c, f) at the time of maximum aperture. The data from all trials from eight participants (filled squares) and two participants (open squares, who showed different patterns from others) are plotted for the target-visible, hand-visible condition (TV-HV, a–c) and the target-not-visible, hand-visible condition (TNV-HV, d–f) of the front target
