FDr but not FDf training transferred to WM.

<p>(a) FDf performance during training (N = 36) for individuals (grey lines) and group average (filled squares). (b) FDr performance during training (N = 24). (c) Improvement of FD trained and control groups on the Tone 3-back task, calculated as the improvement ratio of d’ [(posttest–pretest)/pretest]. (d) Correlation between WM improvement and FDr–FDf improvement (see text). Error bars here and in Figs <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0147320#pone.0147320.g004" target="_blank">4</a>–<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0147320#pone.0147320.g006" target="_blank">6</a> are ± 1 s.e.m.