[Mne_analysis] EEG channel positions

[Rezvan Farahi]

Hi Denis,
Thanks a lot. I thought so too but no, EEG071-EEG074 have locations [0,0,0]
saved for them.
I thought it might have something to do with the numbering jump from 60 to
65 but ECG and EOG channels don't have any positions either.
Probably I'll have to use the digitization points but couldn't find a
description of parameters inside raw.info['dig']? Are they in the same
order as I have digitized during the acquisition? does it include fiducial
and HPI locations too?


Best,
Rezvan

On Tue, Apr 19, 2016 at 9:37 PM, Denis-Alexander Engemann <
denis.engemann at gmail.com> wrote:

> Hi Rezvan,
>
> can you figure out what these channels are. My suspicion would be that
> some channels are labeled EEG but are in fact EMG, or ECG or some other
> physiology readout. These often have no channel positions, hence 0. If this
> is the case your solution would be to exclude those channels.
>
> Denis
>
>
> On Tue, Apr 19, 2016 at 9:24 PM Rezvan Farahi <rezvan.farahi at gmail.com>
> wrote:
>
>> Hello,
>> I'm trying to interpolate the bad channels but it throws the following
>> error since chs['loc'][:3] for a few channels is [0,0,0]:
>> ValueError: 'Could not extract channel positions for 4 channels'
>>
>> I was wondering what could be the reason for this?
>>
>> And whether or not it would make sense to use positions from raw.info['dig']
>> (since I have measured all the EEG channel positions when digitizing)
>> together with set_channel_positions to set the missing positions?
>> If so, where can I get more info about the structures inside raw.info['dig']
>> to make sure which points correspond to the EEG channels
>> (e.g. don't know what does "kind" value mean there.)
>>
>>
>> Many thanks,
>> Rezvan
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