[FieldTrip] create grad struct from headloc channels

[Arjen Stolk]

Hi Anne,

Perhaps others can chime in since I lost the details on how to do this. It
involves ft_headmovement and/or ft_average_sens, the latter of which you
can find in the utilities folder. Have a look at those functions and see if
you can figure it out from there in the meantime.

Best,
Arjen

On Mon, Jul 29, 2019 at 7:35 PM Anne Urai <anne.urai at gmail.com> wrote:

> Hi FieldTrippers,
>
> My data have some sessions in which all trials are recorded in one CTF
> file, and others were participants took breaks in between blocks and there
> are several CTF files. For source reconstruction, I’d like to use each full
> session to have a similar number of trials per participant to estimate my
> common filter and apply a DICS beamformer.
>
> This means I’ll need to create a grad struct from my appended session
> files. As far as I understand, the grad struct for CTF is defined at the
> start of each recording session. In this case, we used online head
> localization, so it makes more sense to take the average gradiometer
> position from all trials (after epoching and artefact rejection) that
> remain in the data.
>
> Is there a way to compute a new grad struct from the headloc channels,
> after appending several recording files?
>
> Best,
>
> —
> Anne E. Urai, PhD
> Postdoctoral Fellow, Cold Spring Harbor Laboratory
> www.anneurai.net / @AnneEUrai
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> https://doi.org/10.1371/journal.pcbi.1002202
>
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