Cognitive, Affective, & Behavioral Neuroscience

, Volume 13, Issue 3, pp 615–626 | Cite as

Number of events and reliability in fMRI

Article

Abstract

Relatively early in the history of fMRI, research focused on issues of power and reliability, with an important line concerning the establishment of optimal procedures for experimental design in order to maximize the various statistical properties of such designs. However, in recent years, tasks wherein events are defined only a posteriori, on the basis of behavior, have become increasingly common. Although these designs enable a much wider array of questions to be answered, they are not amenable to the tight control afforded by designs with events defined entirely a priori, and little work has assessed issues of power and reliability in such designs. We demonstrate how differences in numbers of events—as can occur with a posteriori event definition—affect reliability, both through simulation and in real data.

Keywords

Neuroimaging Design and analysis Statistical power 

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Copyright information

© Psychonomic Society, Inc. 2013

Authors and Affiliations

  1. 1.Department of Psychological & Brain SciencesUniversity of California, Santa BarbaraSanta BarbaraUSA

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