Threshold and transform spmT-maps

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.