A, Mean RTs (error bars, ±1 SEM) as a function of angle between the paired forms of 3DMR task. The classical behavioral signature of the 3DMR task, in which RT increase linearly as a function of angle between the forms, was evident only in nonmusicians. B, Mean RTs (error bars, ±1 SEM) as a function of angle between the paired forms of the 3DMR task during epochs 1–10. C, Mean RTs (error bars, ±1 SEM) as a function of angle between the paired forms of the 3DMR task during epochs 11–20.