Figure 5.

Behavioral results. The error score (ATrD, i.e., the log-transformed average track deviation) for baseline, acquisition phase (TR1–TR12), and DR (mean ± SE) is shown. Within each age group, i.e., young (YA, solid line) and older (OA, dashed line) adults, the bimanual task was practiced following either a blocked (circles) or random (squares) schedule. Better performance is reflected by lower levels of ATrD. Performance of OA was significantly lower compared with performance of YA during baseline (p < 0.01), acquisition phase (p < 0.001), and DR (p < 0.01), reflected by higher levels of ATrD. In both age groups, random practice was detrimental during the acquisition phase (p < 0.001) but resulted in better retention performance (p < 0.01) compared with blocked practice.