Korea Advanced Nano Fab Center View Institution's Website 1 article published in JoVE Neuroscience High-density EEG Recordings of the Freely Moving Mice using Polyimide-based Microelectrode Mina Lee1,2, Dongwook Kim1,2, Hee-Sup Shin1,2, Ho-Geun Sung3, Jee Hyun Choi1,2 1Center for Neural Science , Korea Institute of Science and Technology (KIST), 2Department of Neuroscience, University of Science and Technology, 3Fab Service Department, Korea Advanced Nano Fab Center In this article, we described the surgery procedure and handling tips for implantation of ultra-thin polyimide-based microelectrode array (PBM-array) on the mouse skull for acquisition of high-density encephalography (EEG) in a mouse model.