I had created an account in Brainstorm and downloaded brainstrom3 and unzip. But then in Matlab, I still couldn't open this file.
Open which file?
Go to the brainstorm3 folder and run the brainstorm.m script, as described in the installation instructions:
https://neuroimage.usc.edu/brainstorm/Installation
I want generate a simulated EEG signal from 20 electrodes placing on the scalp. Can the Brainstorm provide this approach? if can, how?
Start by following the introduction tutorials (section Get started) until #23.
Then have a look at the EEG/Epilepsy tutorial, to get additional information about handling EEG in Brainstorm.
https://neuroimage.usc.edu/brainstorm/Tutorials
When you are comfortable with the Brainstorm interface, you will be able to generate signals with the process "Simulate > Simulate generic signals", then associate them with a scout to generate the corresponding EEG recordings with the process "Simulate > Simulate recordings from scouts".
You can look for help by searching this forum, for example:
Simulate scalp recording - #3 by Wisal_Siyam