[Mne_analysis] noise covariance matrix

Laura Munkki lauramunkki at gmail.com
Wed Mar 25 16:35:45 EDT 2020
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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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