The objective is to set montage mne.EvokedArray, for an EEG recording using emotive 14 channels. The 14 channels are AF3,AF4, F3, F4, F7, F8, FC5, FC6, P7, P8, T7, T8, O1 and O2 Since the montage is accoridng to the standard 10-20. I reckon the montage can be extracted via standard_1020_montage …

Temporary workaround Extract electrode location defined in Standard-10-20-Cap81.locs which accessable via EEGLAB repo . 1 -23 0.41111 AF3 2 23 0.41111 AF4 3 -54 0.51111 F7 4 -39 0.33333 F3 5 39 0.33333 F4 6 54 0.51111 F8 7 -69 0.39444 FC5 8 69 0.39444 FC6 9 -90 0.51111 T7 1…

[image] balandongiv: it bother me as the topomaps generated is according to the EEGLAB channel layout Doesn’t this plot include exactly the electrodes that you specified…? I cannot see what’s supposed to be wrong here, but maybe I’m just missing something :thinking:

Your are correct, the plot is exactly as what being defined (i.e., from the .locs) However, I am interested to have the head outline lower on the z dimension, at the level of the anatomical landmarks LPA, RPA, and NAS , as per standard in mne-python. Because of this, I am interested to find a way …

@mmagnuski wrote this tutorial, maybe he can provide some lines of code how to achieve a transformation into the opposite direction :slight_smile:

Thanks for pinging me, Richard! I think you can use that tutorial but specify a different set of channels for the outline specification(chs variable). If that turns out to not be possible - the easiest solution is to change the sphere radius until you get something that you like (sphere argument in…

Thanks for the tips @mmagnuski . I try to change sradius sphere = np.stack([0.00000, 0.00000, 0,sradius]) with different values, but, nothing significant change.mmm. I believe it is not that straight forward to pick the right sradius value.

@balandongiv You don’t have to pass the x, y, z circle midpoint coordinates. You can just pass sphere=value, for example: fake_evoked.plot_topomap(times=0, sphere=0.12) produces the following plot: [image]

but just as @richard says, to do it properly, you’d have to get the x, y, z values of the sphere center based on the position of the channels that you would like to be lying on the topomap head circumference.

Thanks for the information about sphere @richard and @mmagnuski . It is really useful. But rather than having extra step to establish the X,Y,Z coordinate as suggested by @richard , I am thinking to employed the same strategy as mentioned in the OP [image] How to set montage for em…

How to set montage for emotiv 14 channel

Support & Discussions

richard (Richard Höchenberger) April 26, 2022, 8:18pm 8

I don’t think the radius is your problem here, but rather the midpoint of the circle. You’d need to establish the X, Y, Z coordinates of this point, and for this you need the coordinates of LPA, nasion, and RPA…

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How to set montage for emotiv 14 channel

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