SurePrep. Our research team has perfected the clinical practice of recording brain activities ranging from infraslow to conventional as well as ultrafast frequencies. This combining methodology is referred to as clinical Full-band EEG (FbEEG), which has specific requirements in respect to the recording device and its accommodating skin contacts. Thus to obtain high-quality DC-stable skin contact in FbEEG recordings, we have developed a “SurePrep” method, which is now used worldwide across many clinical research laboratories focused on sleep, epilepsy and TMS-EEG. The theory and principle of this method was published for infants and adults in the video clip of Sinisalo et al., 2012 and Stjerna et al., 2010 (see Bibliography). For application in TMS-EEG, please refer to Julkunen et al., 2008.