Scatter plot of performance for the sustained modality.

<p>Each dot represents the performance of one participant. <i>Black triangles</i>: old participants. <i>Grey squares</i>: young participants. The triangles that are in the middle of the group of squares represent old participants whose performance is indistinguishable from that of young people. <i>Vertical</i>: rate of failure F. <i>Horizontal</i>: time (ms). <i>A</i>: low precision, reach time R vs. F. <i>B</i>: low precision, total stabilization time S vs. F. <i>C</i>: high precision, reach time R vs. F. D: high precision, total stabilization time S vs. F. Note that the vertical axes of the graphs differ given the different ranges of rate of failure in low and high precision conditions. In addition, in <i>A</i>, <i>B</i>, the rate of failure is bounded to 0.1 for clarity.