Rxivist logo

Rxivist combines preprints from bioRxiv with data from Twitter to help you find the papers being discussed in your field. Currently indexing 67,044 bioRxiv papers from 295,131 authors.

Variability in the analysis of a single neuroimaging dataset by many teams

By Rotem Botvinik Nezer, Felix Holzmeister, Colin Camerer, Anna Dreber, Juergen Huber, Magnus Johannesson, Michael Kirchler, Thomas Nichols, Russell Poldrack, Tom Schonberg

Posted 15 Nov 2019
bioRxiv DOI: 10.1101/843193

Data analysis workflows in many scientific domains have become increasingly complex and flexible. To assess the impact of this flexibility on functional magnetic resonance imaging (fMRI) results, the same dataset was independently analyzed by 70 teams, testing nine ex-ante hypotheses. The flexibility of analytic approaches is exemplified by the fact that no two teams chose identical workflows to analyze the data. This flexibility resulted in sizeable variation in hypothesis test results, even for teams whose statistical maps were highly correlated at intermediate stages of their analysis pipeline. Variation in reported results was related to several aspects of analysis methodology. Importantly, meta-analytic approaches that aggregated information across teams yielded significant consensus in activated regions across teams. Furthermore, prediction markets of researchers in the field revealed an overestimation of the likelihood of significant findings, even by researchers with direct knowledge of the dataset. Our findings show that analytic flexibility can have substantial effects on scientific conclusions, and demonstrate factors related to variability in fMRI. The results emphasize the importance of validating and sharing complex analysis workflows, and demonstrate the need for multiple analyses of the same data. Potential approaches to mitigate issues related to analytical variability are discussed.

Download data

  • Downloaded 3,272 times
  • Download rankings, all-time:
    • Site-wide: 993 out of 67,043
    • In neuroscience: 139 out of 12,017
  • Year to date:
    • Site-wide: 200 out of 67,043
  • Since beginning of last month:
    • Site-wide: 7 out of 67,043

Altmetric data

Distribution of downloads per paper, site-wide

Sign up for the Rxivist weekly newsletter! (Click here for more details.)