Hello,
We get regularly questions regarding the preprocessing of EEG+DBS or EEG+TMS, but unfortunately we are not familiar with this domain and do not have preprocessing recommendations. As I replied in this other thread (Deep Brain Stimulus (DBS) artifact edge ringing - #2 by Francois):
What I'd recommend is to contact other researchers working with EEG+DBS or EEG+TMS and ask them how they denoise their recordings if they claim they can interpret correctly the EEG during or immediately after the stimulation (during the observed artifact). You can find a list of articles published using Brainstorm on our publications page (https://neuroimage.usc.edu/brainstorm/Pub), and you should also try asking the EEGLAB, FieldTrip and MNE-Python communities.
Please post here any interesting feedback you might get!
Thanks