This functions enables the transformation of spmT-maps to correlation coefficient, effect-size, p-value, or log p-value. For the last case of log transformation this means that a p-value of p=0.99 (0.01) is transformed to a value of 2.
Example
| p-value | -log10(1-P) |
| 0.1 | 1 |
| 0.05 | 1.3 |
| 0.01 | 2 |
| 0.001 | 3 |
All maps can be thresholded using height and extent thresholds and you can also apply corrections for multiple comparisons based on family-wise error (FWE) or false discovery rate (FDR). You can easily threshold and/or transform a large number of spmT-maps using the same thresholds.
Naming convention of the transformed files
Type_Contrast_Pheight_Pextent_K_Neg
| Type: | P | p-value |
| logP | log p-value | |
| R | correlation coefficient | |
| D | effect size | |
| T | t-value | |
| Contrast: | name used in the contrast manager with replaced none valid strings | |
| Pheight: | p | uncorrected p-value in (p<0.05 will coded with “p5″) |
| pFWE | p-value with FWE correction in % | |
| pFDR | p-value with FDR correction in % | |
| Pextent: | p | uncorrected extent p-value in (p<0.05 will coded with “p5″) |
| pkFWE | extent p-value with FWE correction in % | |
| pFDR | p-value with FDR correction in % | |
| K: | extent threshold in voxels | |
| Neg: | image also shows thresholded inverse effects (e.g. neg. values) | |
I recommend to use slice_overlay to overlay the resulting images.