# The definition of phase-locking value(PLV) in python-mne is correct?
**URL:** https://mne.discourse.group/t/the-definition-of-phase-locking-value-plv-in-python-mne-is-correct/2326
**Category:** Mailing List Archive (read-only)
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**Created:** [September 28, 2020, 11:04am UTC](https://mne.discourse.group/t/the-definition-of-phase-locking-value-plv-in-python-mne-is-correct/2326 "2020-09-28T11:04:03Z")
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### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [September 28, 2020, 11:04am UTC](https://mne.discourse.group/t/the-definition-of-phase-locking-value-plv-in-python-mne-is-correct/2326/1 "2020-09-28T11:04:03Z")
External Email - Use Caution
Please allow me to express my gratitude to your software,python-mne. I am a college student on neuroscience. In the following page, I found the PLV definition is given : PLV = |E[Sxy/|Sxy|]|.
[https://mne.tools/stable/generated/mne.connectivity.spectral\_connectivity.html?highlight=spectral\_connectivity](https://mne.tools/stable/generated/mne.connectivity.spectral_connectivity.html?highlight=spectral_connectivity)
The definition is different from that of in the reference ?Measuring phase synchrony in brain signals?.
Are these two equivalent or it is a mistake?I am looking forward to getting your help.
Best regards!
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### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [October 16, 2020, 3:12pm UTC](https://mne.discourse.group/t/the-definition-of-phase-locking-value-plv-in-python-mne-is-correct/2326/2 "2020-10-16T15:12:48Z")
Hi,
Thanks for pointing this out -- can you tell me/us what the definition
is in the reference "Measuring phase synchrony in brain signals"? I
don't have a copy of my own...
Best,
Phillip
> ???External Email - Use Caution???
>
> Please allow me to express my gratitude to your software,python-mne.?I
> am a college student on neuroscience.?In the following page, I found the
> PLV definition is given : PLV = |E[Sxy/|Sxy|]|.
> [https://mne.tools/stable/generated/mne.connectivity.spectral\_connectivity.html?highlight=spectral\_connectivity](https://mne.tools/stable/generated/mne.connectivity.spectral_connectivity.html?highlight=spectral_connectivity)
>
> ?The definition is? different from that of in the reference ?Measuring
> phase synchrony in brain signals?.
>
> Are these two equivalent or it is a mistake?I am looking forward to
> getting your help.
>
> Best regards!
>
> \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
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