Dear Vivien, Under Toolbox: MEEGtools: Re-reference EEG, you can select the channels you would like to use as a reference. Best wishes Martin On 9 Dec2013, at 4:03 PM, Ainley, Vivien (2008) wrote: Dear All I am a complete beginner and would like to know what montage I should use in EEG to re-reference to linked mastoids (EX1 and EX2). I should prefer to do this through the GUI rather than by means of a script. Thanks to anyone who can advise. Vivien Ainley PhD student Royal Holloway University of London