Group data on construct validity, with regression lines (N = 48).

<p><b>A.</b> Perceptual boundary (absolute value) as measured with the adaptive staircase method showed a positive relationship with subject age, with older subjects having larger proprioceptive biases. <b>B.</b> Mean matching estimate (absolute value) is not predicted by subject age. <b>C.</b> PMDD threshold was also positively predicted by subject age, with older subjects tending to have higher thresholds.