# source\_induced\_power: order of the steps power calculation/source reconstruction **URL:** \ **Category:** Mailing List Archive (read-only)\ **Tags:** list-archive\ **Created:** [September 16, 2014, 4:32pm UTC](https://mne.discourse.group/t/source-induced-power-order-of-the-steps-power-calculation-source-reconstruction/822 "2014-09-16T16:32:17Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [September 16, 2014, 4:32pm UTC](https://mne.discourse.group/t/source-induced-power-order-of-the-steps-power-calculation-source-reconstruction/822/1 "2014-09-16T16:32:17Z")
Dear all, I would like to know if the mne.minimum\_norm.time\_frequency.source\_induced\_power function is doing the power/PLV calculation before or after the source reconstruction. It's not clear to me when I have a look on the github code... Thanks a lot, Laetitia Grabot. -------------- next part -------------- An HTML attachment was scrubbed... URL: [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20140916/db6341ea/attachment.html](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20140916/db6341ea/attachment.html) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [September 16, 2014, 4:37pm UTC](https://mne.discourse.group/t/source-induced-power-order-of-the-steps-power-calculation-source-reconstruction/822/2 "2014-09-16T16:37:56Z")
The function name is meant to indicate that the measure operates in source space. IIRC the code may look confusing because the frequency coefficients are calculated in sensor space and projected into source space. This technique is used to give an equivalent result with reduced computation time. Eric