Reply to: fMRI replicability depends upon sufficient individual-level data

Abstract

It is well known that the degree to which research replicates depends upon many factors, including sample size and the amount of data per participant. However, previously, little was known as to what constitutes “enough” for either of these factors when it comes to task-based fMRI. Our earlier publication suggested that typical sample sizes may be associated with fairly low replicability. The present exchange further clarifies this finding by highlighting the role of individual-level sampling. Here, we argue that neither sample size nor individual-level sampling alone is sufficient to predict replicability and that a more productive path forward for the field is to begin to compute these measures as a matter of course so that the field can gain a better understanding of all of the many drivers of replicability.