TABLE 3.
Results for tSNR analyses.
| df | F | p | η2 | Description | ||
| (A) ANOVA: ROI × coil × task × prescan | ||||||
| ROI | 3,66 | 237 | 6.22E–25 | 0.915 | ||
| Coil | 1,22 | 0.46 | 0.502 | 0.021 | ||
| Task | 2,44 | 25.8 | 2.34E–6 | 0.540 | ||
| Prescan | 1,22 | 5.78 | 0.025 | 0.208 | ||
| ROI × coil | 3,66 | 56.8 | 1.13E–12 | 0.721 | Decrease from 20-channel to 64-channel in thalamus; no difference in mot cortex but increase from 20-channel to 64-channel in aud and vis cortex. | |
| ROI × task | 6,132 | 8.98 | 1.00E–4 | 0.290 | Strong increase from mot to aud and vis task in all ROIs with largest values in mot cortex. | |
| Coil × task | 2,44 | 3.31 | 0.053 | 0.131 | ||
| ROI × coil × task | 6,132 | 7.41 | 0.001 | 0.252 | ||
| ROI × prescan | 3,66 | 511 | 1.07E–22 | 0.959 | Larger values in mot cortex with prescan OFF, but larger values in thalamus with prescan ON. | |
| Coil × prescan | 1,22 | 40.8 | 1.95E–6 | 0.650 | Increase in tSNR from 20-channel to 64-channel with prescan ON, but decrease from 20-channel to 64-channel with prescan OFF. | |
| ROI × coil × prescan | 3,66 | 29.8 | 4.07E–7 | 0.576 | ||
| Task × prescan | 2,44 | 1.90 | 0.164 | 0.079 | ||
| ROI × task × prescan | 6,132 | 14.3 | 9.57E–6 | 0.394 | ||
| Coil × task × prescan | 2,44 | 1.12 | 0.332 | 0.049 | ||
| ROI × coil × task × prescan | 6,132 | 5.64 | 0.004 | 0.204 | Figure 4, see Table 3B for interaction | |
| (B) ANOVA: ROI × task × prescan | ||||||
| Visual | Coil | 1,22 | 4.94 | 0.037 | 0.184 | 64 (39.77) > 20 (38.19) |
| Task | 2,44 | 27.6 | 1.15E–6 | 0.557 | aud (40.52) > vis (40.02) > mot (36.40) | |
| Prescan | 1,22 | 14.1 | 0.001 | 0.391 | OFF (40.18) > ON (37.78) | |
| Coil × task | 2,44 | 4.03 | 0.030 | 0.155 | ||
| Coil × prescan | 1,22 | 36.1 | 4.69E–6 | 0.622 | ||
| Task × prescan | 2,44 | 1.08 | 0.345 | 0.047 | ||
| Coil × task × prescan | 2,44 | 1.34 | 0.270 | 0.058 | ||
| Motor | Coil | 1,22 | 0.02 | 0.888 | 0.001 | |
| Task | 2,44 | 23.2 | 3.87E–6 | 0.514 | aud (46.38) > vis (45.64) > mot (41.89) | |
| Prescan | 1,22 | 159 | 1.47E–11 | 0.879 | OFF (52.12) > ON (37.16) | |
| Coil × task | 2,44 | 4.13 | 0.028 | 0.158 | ||
| Coil × prescan | 1,22 | 29.5 | 1.84E–5 | 0.573 | ||
| Task × prescan | 2,44 | 1.31 | 0.280 | 0.056 | ||
| Coil × task × prescan | 2,44 | 2.30 | 0.116 | 0.095 | ||
| Auditory | Coil | 1,22 | 9.81 | 0.005 | 0.309 | 64-channel (39.00) > 20-channel (38.84) |
| Task | 2,44 | 25.7 | 2.94E–6 | 0.539 | aud (39.46) > vis (38.73) > mot (35.58) | |
| Prescan | 1,22 | 74.4 | 1.65E–8 | 0.772 | ON (40.44) > OFF (35.41) | |
| Coil × task | 2,44 | 3.17 | 0.060 | 0.126 | ||
| Coil × prescan | 1,22 | 1.47 | 0.237 | 0.063 | ||
| Task × prescan | 2,44 | 2.70 | 0.081 | 0.109 | ||
| Coil × task × prescan | 2,44 | 1.05 | 0.356 | 0.046 | ||
| Thalamus | Coil | 1,22 | 9.85 | 0.005 | 0.309 | 20 (34.11) > 64- (32.28) |
| Task | 2,44 | 24.9 | 3.53E–6 | 0.532 | aud (34.41) > vis (34.05) > mot (31.13) | |
| Prescan | 1,22 | 1323 | 3.78E–21 | 0.984 | ON (42.09) > OFF (24.30) | |
| Coil × task | 2,44 | 1.71 | 0.195 | 0.072 | ||
| Coil × prescan | 1,22 | 99.7 | 1.23E–9 | 0.819 | ||
| Task × prescan | 2,44 | 7.81 | 0.002 | 0.262 | ||
| Coil × task × prescan | 2,44 | 0.09 | 0.896 | 0.004 | ||
(A) Results of the four-factorial ANOVA and (B) follow-up ANOVAs separated for each ROI. tSNR, time-course signal-to-noise ratio; ROI, region of interest. vis = visual task/ROI, aud = auditory task/ROI, mot = motor task/RO.