Flaundin & Friston's response is interesting because it essentially endorses the findings of Eklund et al. (except for one element of the Eklund analysis that they suggest is a modest error). F&F believe that by setting one parameter correctly (i.e., using a conservative cluster forming threshold) the validity of their preferred parametric statistical approach is upheld. Eklund et al. might quibble because their take-home message is that non-parametric methods should be used instead, but their findings are not misrepresented by F&F.

Regardless, an open and important question is how often other authors used a sufficiently conservative cluster forming threshold for their fMRI analyses. If nothing else, Eklund et al. will cause future reports to be more cautious in this regard.