[FieldTrip] Connectivity comparison across conditions

[Jose Rebola]

Thank you Jan, but I don't quite follow.

1.
I want to perform this analysis intra-subject.
I have a plv value for the elctrode combination 1&2 at 30Hz for condition
1, and another value for condition 2 (they both have 80 trials)
Not sure I understand what you mean by permuting the trial labels and what
I would do with the obtained values.

2.
Also, is it not possible to do this along time?
I mean, the paper of Lachaux in 99 establishes plv in such a way that you
get a plv value for each time point.
In this case, I could compare the timeseries for the two conditions, right?
Is there any way to do this in fieldtrip? Does it compute any connectivity
measure along time?


Thanks once again!

On Thu, Jul 9, 2015 at 10:33 AM, Schoffelen, J.M. (Jan Mathijs) <
jan.schoffelen at donders.ru.nl> wrote:

>  Hi Jose,
>
>  I can think of one out of 2 things:
> -you formulate a null hypothesis pertaining to a group of subjects, and do
> statistical inference across subjects (e.g. by permuting the condition
> labels), or
> -you formulate a null hypothesis pertaining to the observations belonging
> to the individual conditions, and do statistical inference across
> observations, e.g. by permuting the trial labels.
>
>  Best wishes,
> Jan-Mathijs
>
>
>
>   Jan-Mathijs Schoffelen, MD PhD, Senior researcher
>
> Max Planck Institute for Psycholinguistics
> Donders Centre for Cognitive Neuroimaging
>
> E-mail: j.schoffelen at donders.ru.nl
> Telephone: +31-24-3614793
>
> http://www.hettaligebrein.nl
> http://www.fieldtriptoolbox.org
>
>
>
>
>  On Jul 9, 2015, at 11:24 AM, Jose Rebola <jrebola at gmail.com> wrote:
>
>  Hi,
>
>  Is there a straightforward way to compare any connectivity measure at a
> given frequency (say, plv at 30Hz between electrodes 1 and 2) across
> conditions? I end up with one value per channel combination per frequency
> per condition, so what is the right way to compare?
>
>  Thanks in advance,
>
>  Jose Rebola
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