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. 2014 Jul;45:46–59. doi: 10.1016/j.intell.2013.06.008

Fig. 3.

Fig. 3

A twin study of initial proficiency and acquisition of expertise on a motor-skill task with feedback given over 5 blocks of trials on each of 3 days. Open squares indicate monozygotic twins, closed squares indicate dizygotic twins.

Adapted from Fox et al. (1996).