Hi there,
I present an averaged cortical auditory evoked potential (epoch length -200 to 600 ms).
Is there a way to export the green GFP line?
BrainStorm calculates this and displays it as I present it, but there seems to be no way to export this.
No, you can't export it, but it's easy to compute it in a Matlab script.
You can adapt the code the code that computes it in Brainstorm to your own scripts:
To learn how to write scripts with Brainstorm:
https://neuroimage.usc.edu/brainstorm/Tutorials/Scripting
You can also use Clusters, as suggested in this other thread:
Thank you for your suggestions Francois.
But this one is just an average isn't it? Not global field power.
Or are you suggesting that the same principles could be applied using this method to calculate GFP?
If you select all the electrodes, create a cluster and set its function to Power, then you'll get exactly the GFP displayed at the bottom of the ERP figure.
You can use the process "Extract > Cluster time series" to save this GFP in the database as a new "matrix" file.
In this particular example how do you select all the electrodes without clicking through each and every single electrode one by one? Is there a short cut? (like Ctrl+A; tried this did not work).
Two options:
- CTRL+T to get a topography, right-click + drag your mouse to select all the plot (press CTRL+E if you want to check all the electrodes are selected)
- Right-click on the channel file > Edit channel file > CTRL+A