# Basic Query

**URL:** <https://mne.discourse.group/t/basic-query/1781>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [March 12, 2019, 11:32am UTC](https://mne.discourse.group/t/basic-query/1781 "2019-03-12T11:32:27Z")\
**Posts on this page:** 5\
**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:** [March 12, 2019, 11:32am UTC](https://mne.discourse.group/t/basic-query/1781/1 "2019-03-12T11:32:27Z")

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In the example given below:  
[https://martinos.org/mne/stable/auto\_tutorials/plot\_mne\_dspm\_source\_localization.html](https://martinos.org/mne/stable/auto_tutorials/plot_mne_dspm_source_localization.html)

what are the value written below the plots of source localization? for  
example one of the image represents plotting of sources calculated by  
eLORETA method. Some values are written below with heat map. what are those  
values and what do they signify?

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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:** [March 12, 2019, 11:55am UTC](https://mne.discourse.group/t/basic-query/1781/2 "2019-03-12T11:55:03Z")

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Hi Vivek,

The color bar represents neuronal current density in (nA) for distributed  
source localization methods. After applying a suitable threshold to the  
corresponding source space data, you can able to see the experimental  
effects within the brain (i.e., the magnitude of the active sources across  
different time points).

best,  
Dip

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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:** [March 12, 2019, 11:58am UTC](https://mne.discourse.group/t/basic-query/1781/3 "2019-03-12T11:58:18Z")

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Thanks

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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:** [March 12, 2019, 3:02pm UTC](https://mne.discourse.group/t/basic-query/1781/4 "2019-03-12T15:02:20Z")

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For the standard minimum-norm estimate (MNE), the units are Am. Power of  
the dSPM-normalized solution, on the other hand, follows an F distribution  
(see [https://surfer.nmr.mgh.harvard.edu/pub/articles/dale00.pdf](https://surfer.nmr.mgh.harvard.edu/pub/articles/dale00.pdf)).

For eLORETA, I wasn't sure the correct units to use when implementing it,  
so I just kept things somewhat normalized -- the units / scale-factor for  
that solver are thus arbitrary at present. In theory we should be able to  
scale it to provide estimates in Am like MNE, or possibly units of some  
statistical distribution like dSPM. (Help welcome if someone knows how!)

Eric

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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:** [March 12, 2019, 3:20pm UTC](https://mne.discourse.group/t/basic-query/1781/5 "2019-03-12T15:20:28Z")

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Hi Eric!  
Thanks for the correction.