Welcome to the FieldTrip website

FieldTrip is the MATLAB software toolbox for MEG, EEG and iEEG analysis, which is released free of charge as open source software under the GNU general public license.

Please cite the FieldTrip reference paper when you have used FieldTrip in your study.

Robert Oostenveld, Pascal Fries, Eric Maris, and Jan-Mathijs Schoffelen. FieldTrip: Open Source Software for Advanced Analysis of MEG, EEG, and Invasive Electrophysiological Data. Computational Intelligence and Neuroscience, vol. 2011, Article ID 156869, 9 pages, 2011. doi:10.1155/2011/156869.

To get started, head over to the getting started documentation and the tutorials.

Latest release

The latest code developments can be tracked in detail on GitHub.

09 April, 2021

FieldTrip version 20210409 has been released. See GitHub for the detailed list of updates. There’s an important fix to ft_statistics_montecarlo, which restores the correct functionality of the cfg.clusteralpha option, which was accidentally broken with commit 205c75d. This affects releases that were released between March 25, and March 30. See issue (#1731) for more information.

Commits highlights

  • 4ffa4a6 FIX - ensure that findcluster works robustly when called by tfcestat (#1734)
  • 144cdd7 HOTFIX - correctly specify the cfg.alpha for the critical value computation (#1733)
  • 68835fd ENH - added support for cfg.figure=gca, which is more logical in combination with subplot, see also https://github.com/fieldtrip/website/pull/377
  • 55772ea explicitly forbid cfg.trial (without “s”) to prevent typos affecting the analyses
  • 786b527 FIX #1729 - make cfg.channels explicitly forbidden

News and announcements

You can also follow us on Twitter.

29 March, 2021

It is recommended and sometimes even required to provide a sample size estimation prior to starting your data acquisition. Dr. Cheng Wang has contributed a very nice example page that demonstrates how to determine the number of subjects to obtain a certain statistical power, also when using cluster-based permutation tests.

If you also want to contribute an example page, please see here.

18 March, 2021

From 19-23 April 2021 we will again host the Donders MEG/EEG Tool-kit. Although we would have loved to welcome you in-person in Nijmegen, the ongoing COVID situation restricts traveling and large meetings. However, last year we experienced that in an online format the toolkit course is also really fun, effective and rewarding! Preregistration is now open, please see here for further details.

18 December, 2020

Yesterday Mats van Es defended his PhD thesis “On the role of oscillatory synchrony in neural processing” and was awarded the PhD title. Congratulations!

Mats not only used FieldTrip in a number of interesting MEG studies, but also contributed as lecturer in the MEG toolkit courses. Furthermore, he recently implemented the reproducescript functionality (which will be published soon). He continues his research at the MEG center in Oxford.

18 December, 2020

Thanks to Sander, Catarina, Casper, Julia, Christopher, Marije and Maria from the Glasgow Memory Lab for the very kind words on your postcard to the FieldTrip team. Greatly appreciated!

27 November, 2020

Regretfully we identified a bug in FieldTrip releases starting from release 20200701 onward, which might have affected your results.

Specifically, if you have been using ft_sourceanalysis with DICS as a method, and if the order of the channels of the input data structure was not alphabetical, the results are incorrect. This is caused by an accidental alphabetical reordering of the channels in the cross-spectral density matrix, which was not reflected by a similar reordering in the leadfields. We are grateful to Alexandra Steina to help us identify and resolve it. See issue #1587 on GitHub for more information.

Are you affected? If you used a FieldTrip version between 20200701 and 20201126, and you used ft_sourceanalysis with method DICS, and your channels are not in alphabetical order, then you are likely affected. For CTF MEG data the channels are usually in alphabetical order. Neuromag/Elekta MEG data, and MEG data from other systems often have the channels not in alphabetical order. The same holds for EEG data, so your results are likely affected if you are working with EEG data, or non-CTF MEG data.

To resolve the problem, please update to the latest 20201126 release version from the FTP server or from the GitHub release page, recompute your source estimates, and your downstream results.

20 November, 2020

fNIRS is often used in freely moving subjects and in motion research. We implemented a FieldTrip example script that makes a movie of the fNIRS signal, motion capture, and video data together. The movie demonstrates the fNIRS signals and artifacts synchronously with video data during various movements, such as walking, turning, frowning, head movements and jumping. See https://www.youtube.com/watch?v=k1OB-vTWCys.

9 October, 2020

Robert presented two new features of FieldTrip on the online LiveMEEG 2020 conference. We now have the data2bids function to help you to organize your data in the BIDS structure and to share it. Best do this before you start doing your analysis, so that your analysis scripts can be shared along with the data or publication. Furthermore, all high-level FieldTrip functions now have the cfg.reproducescript option that allows you to create a tutorial-style analysis script of everything you do, regardless of how much your original code resembles a plate of spaghetti ;-)

The presentation includes a live demo and has been recorded; you can watch it on Crowdcast. The slides of the presentation are available on SlideShare.