--tstep option in mne_make_movie

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1

Dear MNE Experts,

When specifying the "--tstep" option in mne_make_movie, does using a larger tstep mean that the data are somehow integrated or averaged across the intervening frames, or does it simply select a single frame at the specified interval?

Thanks,
Will

2

Hi Will,

it selects some frames.

Alex

3

The --integ option allows one to control the integration of data. The MNE manual describes how to use this feature (If memory serves it is in Chapter 6 towards the end).

D

4

OK, I see that option in section 6.5.3, but the explanation is a little opaque to me. Is it the case that if I give --integ a value of, say, 20, that it will output an stc file with frames that show results integrated across 20 ms intervals?

-Will

5

My reading of it is below (this is not authoritative).

Let's say data of 1kHz

You want to look at 100Hz

I would do:

--tstep 10 --integ 10

My interpretation of this combo would be

The frame at 0ms is integrated from -5 to 5ms and frame at 10ms is integ. from 5 to 15ms.

You could do something funky like:

--tstep 10 --integ 20

Here you would use each datapoint twice (except for the first and last 10ms):

0ms integ from -10 to 10ms; 10ms integ. from 0ms to 20ms.

I hope this is right.

D