# Laplacian filter

**URL:** <https://mne.discourse.group/t/laplacian-filter/1595>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [August 18, 2018, 10:27am UTC](https://mne.discourse.group/t/laplacian-filter/1595 "2018-08-18T10:27:09Z")\
**Posts on this page:** 2\
**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:** [August 18, 2018, 10:27am UTC](https://mne.discourse.group/t/laplacian-filter/1595/1 "2018-08-18T10:27:09Z")

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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 18, 2018, 11:09am UTC](https://mne.discourse.group/t/laplacian-filter/1595/2 "2018-08-18T11:09:26Z")

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You have to look for the surface Laplacian under its other name, current  
source density, where you see that we haven't implemented it yet but  
it's on our todo list:

[https://github.com/mne-tools/mne-python/issues/4480](https://github.com/mne-tools/mne-python/issues/4480)

Best,  
Phillip

> ???External Email - Use Caution???
> 
> Hi MNE-experts,  
> i'm looking for the (small spatial) laplacian filter as described here:  
> [https://dsp.stackexchange.com/questions/14220/large-laplacian-spatial-filter-on-eeg](https://dsp.stackexchange.com/questions/14220/large-laplacian-spatial-filter-on-eeg)  
> \<[https://dsp.stackexchange.com/questions/14220/large-laplacian-spatial-filter-on-eeg&gt](https://dsp.stackexchange.com/questions/14220/large-laplacian-spatial-filter-on-eeg&gt);  
> ?  
> Is it implemented somehow in MNE? I just can't find anything similar  
> depending on channel neighborhood.  
> ?  
> Thanks and best regards  
> Stephan
> 
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