Neuronal Substrates Underlying Performance Variability in Well-Trained Skillful Motor Task in Humans

Table 1

Brain regions where activity was negatively correlated with the number of correct sequences (PERFROMANCE image).

Brain areas	Coordinates of peaks			-value
	Right hemisphere
MFG	36	44	26	4.52
IFG	36	32	26	4.00
MCC	10	24	38	4.65
45	56	20	30	4.28
6	10	12	56	4.91
Insula	38	10	−10	4.76
PF	62	−32	28	4.90
PFt	50	−36	48	4.84
hiP2	40	−34	38	4.38
7PC	42	−48	58	4.46
7A	34	−56	54	5.48
Left hemisphere
MFG	−34	40	16	4.26
MCC	−10	18	36	4.91
44	−46	10	26	4.36
6	−4	8	52	4.49
Insula	−42	16	−2	4.67
STG	−50	4	−2	4.23
PG	−62	−18	40	4.28
2	−52	−24	38	4.90
PF	−62	−36	20	4.89
PFt	−60	−16	30	4.83
hiP2	−40	−44	48	4.41
hiP3	−30	−50	44	6.04
Lobule VI	−32	−50	−36	4.67
Lobule VII	−44	−52	−34	4.42

Peaks in brain activation that were more than 4 mm apart from each other were reported (voxel size = 2 × 2 × 2 mm). For anatomical identification of peaks, we only considered cytoarchitectonic areas with more than 30% probability available in the anatomy toolbox. Cytoarchitectonic area with the highest probability was reported for each peak. When cytoarchitectonic areas with more than 30% probability were not available for a peak, we simply provided its anatomical location. When several peaks were identified at the same cytoarchitectonic area or anatomical location, we only provided the peak coordinates with the highest -value. MFG: middle frontal gyrus. IFG: inferior frontal gyrus. MCC: middle cingulate cortex. STG: superior temporal gyrus. PG: postcentral gyrus.