# Electrodes in individual montage shifted to front and side **URL:** \ **Category:** Support & Discussions\ **Tags:** eeg, visualization, montage\ **Created:** [October 9, 2024, 9:48am UTC](https://mne.discourse.group/t/electrodes-in-individual-montage-shifted-to-front-and-side/10358 "2024-10-09T09:48:10Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![SilvanaHuertas](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/silvanahuertas/32/3030_2.png) [@SilvanaHuertas](https://mne.discourse.group/u/SilvanaHuertas)\ **Post date:** [October 9, 2024, 9:48am UTC](https://mne.discourse.group/t/electrodes-in-individual-montage-shifted-to-front-and-side/10358/1 "2024-10-09T09:48:10Z")
Hi everyone, I have scanned the position of the EEG electrodes for each one of my participants but when implement the montage, I see that my electrodes are shifted to the front of the head model. I do not have the MRI of my participants. I have tried using a scaling factor of the position of my electrodes and changing the size of the head outline but without success. I haven’t been able to shift the electrodes to be in the correct position. Is there a way to fix this? I have input the position of the electrodes and also the fiducial points when implementing the montage in mne. I’m attaching the figure of the electrodes positions. ![image](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/6/6d011a532050b2b73d54f3f322a86877bd7c0bb2.png) - MNE version: 1.7.1 - operating system: Windows 11 ---
**Author:** ![mscheltienne](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mscheltienne/32/827_2.png) [@mscheltienne](https://mne.discourse.group/u/mscheltienne)\ **Post date:** [October 9, 2024, 8:26pm UTC](https://mne.discourse.group/t/electrodes-in-individual-montage-shifted-to-front-and-side/10358/2 "2024-10-09T20:26:25Z")
What did you actually input in MNE? Values raw from your measurement device? Your measurement device likely measured the position of the fiducials and of the electrodes in a given coordinate frame and in a given unit. Now, it’s up to you to transform those 3D positions from the coordinate frame of the measurement device to the head coordinate frame, defined by the fiducials. - The X-axis goes from [LPA (2) to RPA (1)](https://www.fieldtriptoolbox.org/faq/how_are_the_lpa_and_rpa_points_defined/) - The Y-axis is orthogonal to the X-axis and goes through the [nasion (NAS) (3)](https://en.wikipedia.org/wiki/Nasion) - The Z-axis forms the right-handed orthogonal system And to convert the unit to meters. Mathieu ---
**Author:** ![SilvanaHuertas](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/silvanahuertas/32/3030_2.png) [@SilvanaHuertas](https://mne.discourse.group/u/SilvanaHuertas)\ **Post date:** [October 9, 2024, 9:16pm UTC](https://mne.discourse.group/t/electrodes-in-individual-montage-shifted-to-front-and-side/10358/3 "2024-10-09T21:16:26Z")
Mathieu thank you for your answer. I have transformed all my coordinates to m and I thought that by using mne.channels.make\_dig\_montage and imputing my coordinates and my lpa,rpa and nasion I wouldn’t need to transform my positions. If I do the transformation you were mentioning, when using mne.channels.make\_dig\_montage would I still need to input the fiducials? Thanks ---
**Author:** ![mscheltienne](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mscheltienne/32/827_2.png) [@mscheltienne](https://mne.discourse.group/u/mscheltienne)\ **Post date:** [October 10, 2024, 11:49am UTC](https://mne.discourse.group/t/electrodes-in-individual-montage-shifted-to-front-and-side/10358/4 "2024-10-10T11:49:54Z")
That’s a good point, maybe it should have done the transformation itself especially as I see a `coord_frame` argument defaulting to `unknown` for the native digitizer space… Let’s see what others have to say.