Ragu: a free tool for the analysis of EEG and MEG event-related scalp field data using global randomization statistics

König, Thomas; Kottlow, Mara; Stein, Maria; Melie-Garci­a, L. (2011). Ragu: a free tool for the analysis of EEG and MEG event-related scalp field data using global randomization statistics. Computational Intelligence and Neuroscience, 2011, pp. 1-14. Hindawi Publishing Corporation 10.1155/2011/938925

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We present a program (Ragu; Randomization Graphical User interface) for statistical analyses of multichannel event-related EEG and MEG experiments. Based on measures of scalp field differences including all sensors, and using powerful, assumption-free randomization statistics, the program yields robust, physiologically meaningful conclusions based on the entire, untransformed, and unbiased set of measurements. Ragu accommodates up to two within-subject factors and one between-subject factor with multiple levels each. Significance is computed as function of time and can be controlled for type II errors with overall analyses. Results are displayed in an intuitive visual interface that allows further exploration of the findings. A sample analysis of an ERP experiment illustrates the different possibilities offered by Ragu. The aim of Ragu is to maximize statistical power while minimizing the need for a-priori choices of models and parameters (like inverse models or sensors of interest) that interact with and bias statistics.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > University Psychiatric Services > University Hospital of Psychiatry and Psychotherapy > Psychiatric Neurophysiology [discontinued]
04 Faculty of Medicine > Faculty Institutions > Teaching Staff, Faculty of Medicine

UniBE Contributor:

König, Thomas, Kottlow, Mara, Stein, Maria




Hindawi Publishing Corporation




Thomas König

Date Deposited:

24 Jan 2014 09:43

Last Modified:

06 Jul 2023 00:51

Publisher DOI:






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