[Mne_analysis] Guide For The Selection of cwt_n_cycles {Disarmed}

[balandongiv at gmail.com]

        External Email - Use Caution        

Dear Group,

 

I am trying to understand the tutorial with the title: Compute seed-based
time-frequency connectivity in sensor space, which is accessible via the
link

https://secure-web.cisco.com/1msBx4Jit68_nfxMYTAGESaHHM4kxDy0ef1RW3L664o6Fd1qMQeJ4fmGiXMyUfYyoclcrv6xDvOEf99ssSVB4o14QlKyNjUFknSDZXBhV8CMjo0V5en5FeBkaeaOOzSPh5RkBVATCYyY-mHtgY1qXKNqYHMB6EyZis8KS2wbM3ayjbo0ZaAu2DzVyNfaMovFDGbjTwkoixtG6OrNGPk4ed-EHoLjJ2Dsgy-fF3mPKePsymJinD89xd63nY6fntXfQfNDj1F9BX4fp3Uf36KkMAA/https%3A%2F%2Fmne.tools%2Fstable%2Fauto_examples%2Fconnectivity%2Fplot_cwt_sensor_connecti
vity.html. The tutorial objective is to compute the connectivity between a
seed-gradiometer close to the visual cortex and all other gradiometers. The
connectivity is computed in the time-frequency domain using Morlet wavelets,
and the debiased squared weighted phase lag index is used as a connectivity
metric.

 

In the example, the band of interest are cwt_freqs = np.arange(7, 30, 2).
Then,  the number of cycles is defined as cwt_n_cycles = cwt_freqs / 7. May
I know what is the logic/engineering explanation for the selection of value
SEVEN, here? I have searched the internet, but nothing relevant comes out.
This may be due to incorrect keyword use.

 

Appreciate if someone kind enough to shed some light and direct me to good
reading material about this topic.

 

 

Thanks

 

Regards

Rodney

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