Xim and Maria published a paper on Language Learning using EEG and pupilometry.

Ana Zappa, Polina Osokina, Xim Cerda-Company, David Cucurell, Maria Mateu, Antoni Rodriguez-Fornells
“The Effects of Reliable Social Feedback on Language Learning: Insights from Electroencephalography and Pupillometry”
Journal of Cognitive Neuroscience, 38:5,927-959 (2025)
https://doi.org/10.1162/JOCN.a.2420