Print

Print


Dear Ulrich,

Yes, I think this is a good way to do it.

Vladimir

On Mon, Feb 25, 2019 at 1:12 PM Pomper, Ulrich <[log in to unmask]> wrote:

> Dear Vladimir,
>
>
> Many thanks for your help!
>
> May I ask: As a reviewer, would you agree with the following procedure:
>
>
>
>    1. Data at scalp-level show ITC effect at certain time-frequency
>    window.
>    2. For source estimation of this effect, the evoked response at this
>    time-frequency window is inverted.
>    3. Optionally, just as a double check, the time-series at the voxel
>    with the maximum source activity is extracted, and ITC is demonstrated
>    again for these data.
>
>
> Best wishes,
> Ulrich
>
>
>
>
> ------------------------------
> *From:* Vladimir Litvak <[log in to unmask]>
> *Sent:* 25 February 2019 11:53
> *To:* Pomper, Ulrich
> *Cc:* [log in to unmask]
> *Subject:* Re: [SPM] PLV / ITC source estimation
>
> Dear Ulrich,
>
> In principle, inter-trial coherence has a very close relation to ERP so
> it's unlikely that the sources of the two are different. The way you would
> localise an ITC effect is by doing source reconstruction of your epoched
> data, followed by source extraction, then computing ITC at the source level
> and then doing stats on that. If you are interested in specific ROIs,
> that's quite easy. If you want to do it for the whole mesh, it can also be
> done but with slightly more tweaking.
>
> Best,
>
> Vladimir
>
> On Fri, Feb 22, 2019 at 9:08 AM Pomper, Ulrich <[log in to unmask]> wrote:
>
> Dear SPM users,
>
>
> My apologies for bumping my question, I just thought I'd give it a second
> try.
>
> If anyone has an idea on how to compute source estimates of
> Intertrial-coherence I'd very much appreciate your help!
>
>
> Best wishes,
>
> Ulrich
>
>
>
>
> ------------------------------
> *From:* Pomper, Ulrich
> *Sent:* 13 February 2019 11:11
> *To:* [log in to unmask]
> *Subject:* PLV / ITC source estimation
>
>
> Dear SPM users,
>
>
>
> In my data, have found a significant difference in inter-trial coherence /
> phase locking between two conditions at the scalp level. Now I would like
> to calculate a source estimate of that ITC effect, similar to a source
> inversion of a power effect in a certain time-frequency window. Could
> anybody point me in a direction how to do that?
>
> I know how to invert time-frequency data and evoked fields, but I haven’t
> seen anything on ITC yet.
>
> I’d be very grateful for any help in that regard!
>
>
>
> Many thanks,
>
> Ulrich
>
>
>
>
> --
> Dr. Ulrich Pomper
>
> Department of Basic Psychological Research and Research Methods
> University of Vienna
> Austria
> +43-1-4277-47149 <+431-4277-47149>
>
> [log in to unmask]
>
> Researchgate <https://www.researchgate.net/profile/Ulrich_Pomper>
>
>
>