Table 1.
Concordance between activation peaks listings reported from 5 min (p < 10-3 uncorrected, cluster extent 10 voxels) or from 30 minutes (p < 10-3 corrected, cluster extent 10 voxels) of functional acquisition, for four contrasts and 2 subjects
| right-left hand action | audio – video trials | reading – checkerboard | calculation – sentences | ||||||
| subject 1 | subject 2 | subject 1 | subject 2 | subject 1 | subject 2 | subject 1 | subject 2 | mean | |
| ▪ proportion of the 6 blocks session local maxima detected as local maxima of the first block | 100% (of 2 max.) | 67% (of 3 max.) | 100% (of 8 max.) | 82% (of 11 max.) | 54% (of 41 max.) | 80% (of 5 max.) | 83% (of 35 max.) | 84% (of 19 max.) | 74% (of 124 max.) |
| ▪ proportion of the 6 blocks session main maxima detected as main maxima of the first block | 100% (of 2 max.) | 67% (of 3 max.) | 80% (of 5 max.) | 80% (of 5 max.) | 82% (of 11 max.) | 80% (of 5 max.) | 70% (of 10 max.) | 82% (of 11 max.) | 79% (of 52 max.) |
| ▪ proportion of the first block local maxima not detected as local maxima of the six blocks session | 50% (of 4 max.) | 0% (of 2 max.) | 11% (of 9 max.) | 50% (of 18 max.) | 4% (of 23 max.) | 55% (of 9 max.) | 29% (of 38 max.) | 62% (of 43 max.) | 38% (of 146 max.) |
| ▪ proportion of the first block main maxima not detected as main maxima of the six blocks session | 50% (of 4 max.) | 0% (of 2 max.) | 20% (of 5 max.) | 20% (of 5 max.) | 18% (of 11 max.) | 55% (of 9 max.) | 41% (of 12 max.) | 62% (of 24 max.) | 41% (of 146 max.) |
| ▪ mean distance for local maxima detected in the first block from their final coordinates reported in the 6 blocks session | 9 mm | 11 mm | 5 mm | 4 mm | 4 mm | 4 mm | 5 mm | 10 mm | 6 mm |
| ▪ mean distance for main maxima detected in the first block from their final coordinates reported in the 6 blocks session | 9 mm | 11 mm | 3 mm | 3 mm | 2 mm | 4 mm | 5 mm | 10 mm | 5 mm |
The first two lines describe respectively the number of maxima successfully isolated with the short 5 min brain mapping and the proportion of maxima reported in the first block but not in the six blocks session. The third line gives an estimation of the spatial precision of peak location after one block (calculated as the average distance from the location obtained after 6 blocks). Analysis were performed both for 'local' maxima (all maxima listed in SPM at that threshold) and 'main' maxima (most significantly activated peaks – see methods).