[Mne_analysis] noise covariance matrix

[Laura Munkki]

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I forgot to say, that I used filter 0.5-20 Hz for the averaged ERPs, I
didn't filter data before averaging. But the NCM is calculated from epochs,
so may be it is incorrect to filter epochs?

On Wed, Mar 25, 2020 at 10:35 PM Laura Munkki <lauramunkki at gmail.com> wrote:

> Hi,
> I am analyzing auditory evoked responses (N100).
> I calculated NCM for pre-stimulus activity (500 ms long epochs).
> For the ERPs I used filter 0.5-20, and I applied the same for the NCM
> epochs. The dSPM was totally messy. Then I tried to calculate the NCM
> without filters, and, surprisingly, the N100 was localized perfectly to the
> auditory cortex.
> Is it necessary to use the same filter before the NCM calculations?
> Thank you,
> Laura
>
>
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