Sentence:  In [21] we have four musicians (a violinist, a flautist, a cellist, and a <WSD>'brainist</WSD>'), where during the  performance the  <WSD>brainist</WSD> delivers drone sounds by re-experiencing emotions  (classified by EEG) that has been associated with the sounds  during  a training session... 
Meaning of the word marked with <WSD> tags:  One who creates music by re-experiencing emotions while attached to an EEG cap.