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Averaged-SD of postural responses for L/R and A/P directions. (a) Averaged-SD of COP or head position during vection and no-vection in both the L/R and A/P directions. Also shown are the continuous values of averaged-SD of either (b) COP or (c) head position after the visual stimulus motion ceased. The two data points in the left-most part of (b) and (c) represent averaged-SD in the L/R and A/P directions during visual-stimulus-motion.
