FIGURE 1.

Choices of inferential methods and sample sizes used by the surveyed studies. The majority of the surveyed studies used clusterwise inference and recruited 50 subjects or fewer. For the studies using clusterwise inference, the cluster-defining primary thresholds (CDTs) used by them were recorded. According to Woo et al. (2014) and Eklund et al. (2016), a CDT at or more stringent than p = 0.001 is recommended (indicated by red portions of the bars in the lower panel). This was achieved by 70.9%, 37.6%, and 23.1% of studies using SPM, AFNI, and FSL, respectively.