[Mne_analysis] Stimulus-evoked data connectivity

[Denis-Alexander Engemann]

Hi Dave,

no all is computed across trials. When using a continuous Morlet Wavelet
the cross-spectral density matrix is time-resolved but the same metrics can
be computed. You always consume the trials dimensions in both case,
irrespective of the connectivity metric.

Hope that helps,
Denis

On Wed, Apr 12, 2017 at 4:15 PM David I Leitman <leitman at mail.med.upenn.edu>
wrote:

> Hi Dennis,
>
>  I don’t mean to bud in, but a quick question
>
> are both of these examples
>
>
> http://www.martinos.org/mne/stable/auto_examples/connectivity/plot_mne_inverse_connectivity_spectrum.html#sphx-glr-auto-examples-connectivity-plot-mne-inverse-connectivity-spectrum-py
>
> http://www.martinos.org/mne/stable/auto_examples/connectivity/plot_cwt_sensor_connectivity.html#sphx-glr-auto-examples-connectivity-plot-cwt-sensor-connectivity-py
>
> calculating phase connectivity  across trials that is- wPLI is calculated
> from the phase angle difference distributions at a particular point across
> trials
>
> or is one or both often calculating  phase angle differences from multiple
> points across the time from within each trial that is wPLI across time?
>
> thanks //dave
>
>
> On Apr 12, 2017, at 9:08 PM, Denis-Alexander Engemann <
> denis.engemann at gmail.com> wrote:
>
> Hi!
> You can checkout the "cwt_morlet" option to get time resolved
> connectivity. See this example
> http://www.martinos.org/mne/stable/auto_examples/connectivity/plot_cwt_sensor_connectivity.html#sphx-glr-auto-examples-connectivity-plot-cwt-sensor-connectivity-py
>
> Hope that helps,
> Denis
> On Wed, 12 Apr 2017 at 15:02, daisy <smartcandies at 163.com> wrote:
>
> Hi All,
>
> I have two questions when I compute source space connectivity.
>
> (1) Is mne.connectivity.spectral_connectivity designed for
> stimulus-evoked data ？(Because I notice that the example data was
> stimulus-evoked.)
> (2) I want to know whether the connectivity was changed over time. Can I
> compute the connectivity under different time window (eg: 100-150ms,
> 150-200ms after stimulus onset). Is it reasonable?
>
> Could anyone help me ?
>
> Thank you so much.
>
> -Best
>
> Xiaoxu
>
>
>
>
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