[Mne_analysis] Creating SSPs

[Denis-Alexander Engemann]

Thanks for the quick reply Hari,

so in the first place creating ECG / EOG / empty room SSPs should
yield a reasonable time-spent-checking / noise reduction trade-off...
In the case of the study I'am currently analysing the event-related
SSP might be difficult, as the paradigm implies a high level baseline
which means that the non-events are already quite meaningful and the
difference between baseline and event is really specific.  Also the
breaks between the events are just 2 to 3 seconds.

Denis

2012/9/10 Hari Bharadwaj <hari at nmr.mgh.harvard.edu>:
> Hi Denis,
> You can apply SSPs to multiple noise sources on top of each other... SSPs
> operate by taking out data that have a spatial pattern similar to the
> spatial pattern of the noise that you specify... Hence you have to be
> careful when making SSPs out of baseline data... If you have long enough
> chunks of baseline data then usually only noises dominate the first few SSP
> components but you should inspect to make sure that is the case...
>
> Regards,
> Hari
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
> Denis-Alexander Engemann <d.engemann at fz-juelich.de> wrote:
>>
>> Dear list,
>>
>> as an extension to the last thread on SSPs I've got a few questions.
>> As I understood it so far one can include several projectors, such
>> that noise-covariance SSPs and EOG /ECG SSP may complement each other.
>> However, Is there actually one preferable way of obtaining
>> noise-covariance SSPs, that is empty room VS pre-event baseline?
>> Or does it even make sense to combine the two?
>>
>> Cheers,
>> Denis
>>
>>
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