concatenation of raw-fif-files

✉️ Mailing List Archive (read-only)
1

Dear MNE users,

does one of you know if you can combine transed raw-data files into one file.
Any suggestions are highly appreciated.

Best wishes, Matthias

2

Hello Matthias -

I don't know if there's a program provided with mne to do that for you, but you could always use the matlab routines (beginning with the example script in mne_ex_read_write_raw.m) to create your own fif files. I've modified that script for my own use... its not too difficult. Take note, though, that some filesystems have problems dealing with individual files larger than 4 GB.

Eliezer Kanal

3

Hello,

Furthermore, the fif files cannot be larger than 2 GB.

- Matti

4

Hi Everyone,

Does anyone know of a good reference regarding the approximate SNR of unaveraged neural activity measured by MEG? I just need a ballpark estimate. Many thanks in advance.

Avniel Ghuman, Ph.D.
Postdoctoral Research Fellow
Laboratory of Brain and Cognition, NIMH
10 Center Drive
Room 4C116, MSC 1366
Bethesda, MD 20892-1366

5

Hi Avniel,

Comparing the spectra of raw MEG with the spectra obtained from MEG
recorded with no subject (empty room data) if you have access to it might
not be a bad way to set the SNR values.

We use 3 for the SNR of unaveraged data. This seems to agree roughly with
the size of the spectra of resting state MEG and empty room MEG (atleast
upto 55 Hz). We have a triple shielded room though.

Regards,
Hari

6

Hi Hari,

Thanks, I actually could use a reference to respond to a pesky reviewer if you know of one...

Best Wishes,
Avniel

Hi Avniel,

Comparing the spectra of raw MEG with the spectra obtained from MEG
recorded with no subject (empty room data) if you have access to it might
not be a bad way to set the SNR values.

We use 3 for the SNR of unaveraged data. This seems to agree roughly with
the size of the spectra of resting state MEG and empty room MEG (atleast
upto 55 Hz). We have a triple shielded room though.

Regards,
Hari