参考文献
文中のグラフは以下のものを改変しています。
Nicola Hodges andA. Mark Williams, 2012,
"Skill Acquisition in Sport: Research, theory
and practice 2nd Ed.", No.2525 Figure 5.2
なお、元の研究は
KG Hallら, 1994, "Contextual interference
effect with skilled baseball player",
Perceptual and Motor Skills, 78, 835-841