Title should really read "fMRI" instead of "MRI". The referenced journal article is titled "Cluster failure: Why fMRI inferences for spatial extent have inflated false-positive rates".
Preprint version of the "Cluster failure" paper, from last year: http://arxiv.org/abs/1511.01863
Response: http://arxiv.org/abs/1606.08199
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.