# save time when computing PSD over Epochs

**URL:** <https://mne.discourse.group/t/save-time-when-computing-psd-over-epochs/2185>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [May 6, 2020, 5:19pm UTC](https://mne.discourse.group/t/save-time-when-computing-psd-over-epochs/2185 "2020-05-06T17:19:24Z")\
**Posts on this page:** 3\
**Page:** 1

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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:** [May 6, 2020, 5:19pm UTC](https://mne.discourse.group/t/save-time-when-computing-psd-over-epochs/2185/1 "2020-05-06T17:19:24Z")

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Hello,

I am trying to compute the PSD of Epochs data at source level using multitapper (compute\_source\_psd\_epochs function). This is very time consuming and I am only interested in the average PSD over epochs; however I didn't find anything to calculate the PSD at source level on an Evoked object.

Thanks in advance,

Fleur  
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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:** [May 6, 2020, 7:19pm UTC](https://mne.discourse.group/t/save-time-when-computing-psd-over-epochs/2185/2 "2020-05-06T19:19:44Z")

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hi Fleur,

I would recommend you to follow this tutorial.

[https://mne.tools/stable/auto\_examples/inverse/plot\_evoked\_ers\_source\_power.html?highlight=dspm%20power](https://mne.tools/stable/auto_examples/inverse/plot_evoked_ers_source_power.html?highlight=dspm%20power)

It's not based on multitaper but maybe it's good enough?

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:** [May 7, 2020, 3:10pm UTC](https://mne.discourse.group/t/save-time-when-computing-psd-over-epochs/2185/3 "2020-05-07T15:10:28Z")

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Hello,

Thanks, I will look into it.

Fleur