# \[mne-python\] use spectral\_connectivity on a single	epoch

**URL:** <https://mne.discourse.group/t/mne-python-use-spectral-connectivity-on-a-single-epoch/785>\
**Category:** Mailing List Archive (read-only)\
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**Created:** [August 7, 2014, 12:34pm UTC](https://mne.discourse.group/t/mne-python-use-spectral-connectivity-on-a-single-epoch/785 "2014-08-07T12:34:49Z")\
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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [August 7, 2014, 12:34pm UTC](https://mne.discourse.group/t/mne-python-use-spectral-connectivity-on-a-single-epoch/785/1 "2014-08-07T12:34:49Z")

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Hi all,

Using mne-python, is it possible to use spectral\_connectivity on a  
single epoch at a time.

I have a single subject and I would like to calculate the Phase-Locking  
Value (or similar "connectivity" measure) on single trial basis. As I  
understand the output of the spectral\_connectivity the returned object  
is one value and not one per epoch. Is it possible to get it to return a  
value per epoch or does that simply not make any sense to do?

thanks,  
mads

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [August 8, 2014, 3:06pm UTC](https://mne.discourse.group/t/mne-python-use-spectral-connectivity-on-a-single-epoch/785/2 "2014-08-08T15:06:24Z")

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hi mads,

just call spectral\_connectivity on each epoch.

for k in range(len(epochs)):  
&nbsp;&nbsp;&nbsp;&nbsp;out = spectral\_connectivity(epochs[k], ...)  
&nbsp;&nbsp;&nbsp;&nbsp;....

or something along these lines.

HTH  
Alex

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [August 8, 2014, 3:14pm UTC](https://mne.discourse.group/t/mne-python-use-spectral-connectivity-on-a-single-epoch/785/3 "2014-08-08T15:14:54Z")

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> hi mads,
> 
> just call spectral\_connectivity on each epoch.
> 
> for k in range(len(epochs)):  
> &nbsp;&nbsp;&nbsp;&nbsp;out = spectral\_connectivity(epochs[k], ...)  
> &nbsp;&nbsp;&nbsp;&nbsp;....

Arent' these all measures that are defined across epochs??

> or something along these lines.
> 
> HTH  
> Alex
> 
> \> Hi all,  
> \>  
> \> Using mne-python, is it possible to use spectral\_connectivity on a  
> \> single epoch at a time.  
> \>  
> \> I have a single subject and I would like to calculate the Phase-Locking  
> \> Value (or similar "connectivity" measure) on single trial basis. As I  
> \> understand the output of the spectral\_connectivity the returned object  
> \> is one value and not one per epoch. Is it possible to get it to return a  
> \> value per epoch or does that simply not make any sense to do?  
> \>  
> \> thanks,  
> \> mads  
> \> \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_  
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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [August 8, 2014, 5:17pm UTC](https://mne.discourse.group/t/mne-python-use-spectral-connectivity-on-a-single-epoch/785/4 "2014-08-08T17:17:54Z")

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Normally all the connectivity measures are defined across epochs, and look  
for consistency of phase across them. For single trial value is one.

You can do connectivity across time however window need be very long in  
order to compensate for the bias in the connectivity.

Sheraz