[FieldTrip] beamformer to localize spontaneous oscillation source

[Eelke Spaak]

Dear Weiwei,

After using cfg.dics.projectnoise = 'yes', did you also compute the
"Neural Activity Index" by computing source.avg.pow = source.avg.pow
./ source.avg.noise? If not, the noise estimate remains unused.

Best,
Eelke

On 19 November 2013 13:50, PWW <ww.peng0923 at gmail.com> wrote:
> Dear Fieldtrippers,
>
> In the beamformer tutorial
> (http://fieldtrip.fcdonders.nl/tutorial/beamformer), the contrast of
> (post-pre)/pre was calculated to circumvent the  noise bias towards the
> center of the head.
>
> However, I wonder whether it is possible to only localize the pre-stimulus
> oscillation source, such as pre-stimulus alpha power for example, just like
> localizing the sources of spontaneous oscillatory activity. Actually, I
> tried to do it, and use neural activity index to remove the center of the
> head bias, by setting setting cfg.dics.projectnoise='yes'. But it doesn't
> work so well.
>
> Does anyone have any suggestions about localizing the cortical sources of
> spontaneous oscillatory activity (e.g. pre-stimulus interval only)? is it
> any difference with the procedures described in the tutorial?
>
> Any pointers would be much appreciated.
>
> Thanks.
>
> Regards,
>
> Weiwei
>
>
>
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