mne version 1.8.0 windows 11 Hi experts, I am a biginner of mne. I study time_frequency.py(mne-python/mne/minimum_norm/time_frequency). In def _single_epoch_tfr, line432, script is plv_f /= np.abs(plv_f). Please let me know the meaning, background, source of “plv_f /= np.abs(plv_f).” The rep…

[image] oyamat: plv_f /= np.abs(plv_f) @oyamat , that line of code was written 10 years ago, so I don’t think someone on this forum can describe it in great detail for you :frowning: Here’s what I can say: PLV stands for Phase Locking Value. Practically speaking, plv_f /= np.abs(plv_f) …

Dear Scott, Thank you for your response. I don’t understand the correct definition of Phase Locking Value(PLV), Phase Locking Factor(PLF), the Evoked Power. Then, (1) If the value is divided by the absolute of coefficients of the complex, the value will become PLF ? (2) PLF is applied to a singl…

Hi, I think plf_f is a complex number and dividing by it’s absolute value only amounts to applying a scaling factor that makes the amplitude span the range [0, 1]. In that respect, PLV is not converted to PLF when applying the normalization. I am no expert, but I would that’s true based on a coupl…

Assuming plv_f /= np.abs(plv_f) is equal to CSDxy/|CSDxy| this is just a method to obtain e^(i theta) where theta is the phase difference between x and y signal. By average CSDxy/|CSDxy| across epochs you get a plv value. I came to this conclusion from reading the following articles. Ricardo Bruña …

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sotpapad (Sotiris Papadopoulos) November 29, 2024, 8:34am 3

Maybe it’s as discussed in this thread?

Topic		Replies	Views
calculating phase locking values on MNE source estimate within labels- using mne.minimum_norm.source_induced_power Mailing List Archive (read-only) list-archive	1	341	December 27, 2017
The definition of phase-locking value(PLV) in python-mne is correct? Mailing List Archive (read-only) list-archive	1	1847	October 16, 2020
The definition of phase-locking value(PLV) in python-mne is correct? Mailing List Archive (read-only) list-archive	0	366	September 25, 2020
How to compute PLV ? Mailing List Archive (read-only) list-archive	1	248	July 18, 2019
PLV in label in source space Mailing List Archive (read-only) list-archive	4	185	September 19, 2014

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