[Mne_analysis] Read head position from .fif file

[Benoît MARTIN]

Thanks a lot for helping and for the solutions,
Best,
Benoît

2016-07-13 18:55 GMT+02:00 Eric Larson <larson.eric.d at gmail.com>:

> Eric, shouldn't you be able to read the head position directly from the
>> *.fif files because you have the head_to_dev transforms?
>>
>
> The initial head position is stored in info['dev_head_t'], yeah. However
> the time-varying head position, which is needed for movement compensation,
> isn't stored in the FIF file until 1) movement compensation is performed in
> Python or MaxFilter, or 2) MaxFilter is run in head-position-only mode as
> `maxfilter -headpos ...`.
>
> We have done some work in MNE-Python on estimating the head positions
> directly, but it's still experimental. So for now you can do something like
> this to get a suitable head-position text file:
>
> maxfilter -f test_raw.fif -headpos -format short -hp test_raw_hp.pos
>
>
> Note that this MaxFilter mode will also write out a test_raw_quat.fif
> file, which is the same as the input file, but with the head positions
> added as channels. But for MNE-Python it's easiest to use the ASCII text
> file output test_raw_hp.pos instead.
>
> Eric
>
>
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