Table 3. Improvisation and self-initiation.

Talairach coordinates for the peak activations and deactivations for the contrast “improvised versus non-improvised” (i.e., Leading + Solo > Mutual + Alone), p < 0.05 with FDR correction. Also included are the coordinates for the peak activations for the contrast “self-initiated versus externally-triggered” ([Leading + Solo + Mutual + Alone] > Following), p < 0.05 with FDR correction. BA = Brodmann area, k = number of voxels, t = maximum t value, RH = right hemisphere, LH = left hemisphere. Abbreviations: CMA, cingulate motor area; DLPFC, dorsolateral prefrontal cortex; IFG, inferior frontal gyrus; M1, primary motor cortex; PHC, parahippocampal gyrus: PMC, premotor cortex; SMA, supplementary motor area; SPL, superior parietal lobule; STG, superior temportal gyrus; TPJ = temporo-parietal junction.

			TAL coordinates
Areas	Hemisphere	BA	x	y	z	t (peak)	k
Improvisation
FRONTAL
M1/PMC	LH	4, 6	-27	-16	52	13.13	168
SMA	RH/LH	6	0	-4	52	8.58	513
CMA	LH	24, 32	-12	5	37	8.19	211
M1/PMC	RH	4, 6	18	-22	55	6.71	114
DLPFC	LH	8, 9, 46	-48	32	31	6.01	105
PMC	LH	6, 22	-48	-1	28	5.71	41
IFG	RH	44, 22, 6	45	2	7	5.59	49
IFG	LH	22, 6	-54	5	4	5.25	49
PARIETAL
SPL	LH	7	-18	-70	49	9.05	121
SPL	RH	7	15	-64	55	7.63	127
SPL	LH	7, 40	-39	-55	52	4.38	23
TEMPORAL
STG	LH	22	-60	-40	19	7.41	67
SUBCORTICAL
Thalamus	RH/LH		0	-16	16	5.64	33
Putamen	RH		18	2	10	4.90	20
Putamen	LH		-24	-7	10	4.63	22
CEREBELLUM
Declive	RH		39	-70	-20	5.20	40
Self-initiation
FRONTAL
DLPFC	LH	9	-42	32	37	8.44	60
PARIETAL
SPL	RH	7, 19	6	-82	49	5.87	77
SPL	LH	7, 19	-12	-82	46	6.65	198