# the calculation process of function source\_induced\_power()

**URL:** <https://mne.discourse.group/t/the-calculation-process-of-function-source-induced-power/7569>\
**Category:** Support & Discussions\
**Created:** [September 25, 2023, 2:49pm UTC](https://mne.discourse.group/t/the-calculation-process-of-function-source-induced-power/7569 "2023-09-25T14:49:55Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![yuyu](https://avatars.discourse-cdn.com/v4/letter/y/71e660/32.png) [@yuyu](https://mne.discourse.group/u/yuyu)\
**Post date:** [September 25, 2023, 2:49pm UTC](https://mne.discourse.group/t/the-calculation-process-of-function-source-induced-power/7569/1 "2023-09-25T14:49:55Z")

</div>

hello, everyone, we use two ways to compute time-frequency maps in a label of the source space:  
1.Using source\_ Induced\_Power() to calculate the time-frequency map of the label;  
2.Firstly, using apply\_inverse\_epochs() calculate the source, then using mne.extract\_label\_time\_course() to extract the label’s time courses, finally, computing time-frequency maps using the time courses.  
But there are some differences in our calculation results,Did I make a calculation mistake somewhere? what’s more, I want to ask the calculation process of function source\_induced\_power() ?  
Thank you very much!