Table 1.

Comparing running time (seconds) of different approaches on synthetic fMRI data.

Number of Voxels (N)	GPU-PCC	Fast-GPU-PCC	Wang et al. [20]	CPU Version
20,000	0.73	0.47	1.58	15.65
30,000	1.6	0.96	3.28	35.23
40,000	2.9	2.40	5.71	62.81
50,000	4.5	3.2	8.65	98.8
60,000	6.5	4.7	12.15	143
70,000	8.8	6.07	16.2	202
80,000	11.6	7.7	21.56	270
90,000	14.7	8.9	26.95	341
100,000	18.14	10.9	31.99	424