# mne.minimum\_norm.source\_induced\_power

**URL:** <https://mne.discourse.group/t/mne-minimum-norm-source-induced-power/996>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [April 12, 2016, 4:49pm UTC](https://mne.discourse.group/t/mne-minimum-norm-source-induced-power/996 "2016-04-12T16:49:14Z")\
**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:** [April 12, 2016, 4:49pm UTC](https://mne.discourse.group/t/mne-minimum-norm-source-induced-power/996/1 "2016-04-12T16:49:14Z")

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Hi MNE Experts,

I am using the python function source\_induced\_power, having the following github code:

[https://github.com/mne-tools/mne-python/blob/master/mne/minimum\_norm/time\_frequency.py](https://github.com/mne-tools/mne-python/blob/master/mne/minimum_norm/time_frequency.py)

What are the units of the power output values? Are they in dB? It seems that power is in dB only when the values are baseline corrected with a rescaling option of ?log ratio?.

Can you please confirm if this is actually the case since this is not documented?

Thanks so much,

Charmaine

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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:** [April 12, 2016, 5:23pm UTC](https://mne.discourse.group/t/mne-minimum-norm-source-induced-power/996/2 "2016-04-12T17:23:33Z")

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hi,

see

[https://github.com/mne-tools/mne-python/blob/master/mne/minimum\_norm/time\_frequency.py#L369](https://github.com/mne-tools/mne-python/blob/master/mne/minimum_norm/time_frequency.py#L369)

if no baseline is set then you get raw power.

when using logratio it is the log of the ratios so it's not really dB either.

hope this helps

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:** [April 12, 2016, 6:02pm UTC](https://mne.discourse.group/t/mne-minimum-norm-source-induced-power/996/3 "2016-04-12T18:02:31Z")

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Hi Alex,

Thank you, that?s very helpful!

Best,

Charmaine