title: A capacitive, biocompatible and adhesive electrode for long-term and cap-free monitoring of EEG signals.
abstract: OBJECTIVE
  Long-term electroencephalogram (EEG) monitoring broadens EEG applications to various areas, but it requires cap-free recording of EEG signals. Our objective here is to develop a capacitive, small-sized, adhesive and biocompatible electrode for the cap-free and long-term EEG monitoring.
  
  
  METHODS
  We have developed an electrode made of polydimethylsiloxane (PDMS) and adhesive PDMS for EEG monitoring. This electrode can be attached to a hairy scalp and be completely hidden by the hair. We tested its electrical and mechanical (adhesive) properties by measuring voltage gain to frequency and adhesive force using 30 repeat cycles of the attachment and detachment test. Electrode performance on EEG was evaluated by alpha rhythm detection and measuring steady state visually evoked potential and N100 auditory evoked potential.
  
  
  RESULTS
  We observed the successful recording of alpha rhythm and evoked signals to diverse stimuli with high signal quality. The biocompatibility of the electrode was verified and a survey found that the electrode was comfortable and convenient to wear.
  
  
  CONCLUSIONS
  These results indicate that the proposed EEG electrode is suitable and convenient for long term EEG monitoring.
authors.affiliation: Department of Biomedical Engineering, College of Health Science, Korea University, Seoul 136-100, Korea. phd.smlee@gmail.com
authors.forename: Seung Min
authors.initials: SM
authors.lastname: Lee
authors.forename: Jeong Hun
authors.initials: JH
authors.lastname: Kim
authors.forename: Hang Jin
authors.initials: HJ
authors.lastname: Byeon
authors.forename: Yoon Young
authors.initials: YY
authors.lastname: Choi
authors.forename: Kwang Suk
authors.initials: KS
authors.lastname: Park
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Lee
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004566:Electrodes; D004569:Electroencephalography / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008904:Miniaturization; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009757:Nylons / Q000737:chemistry*; D055815:Young Adult
chemical_list: D000269:Adhesives; D001672:Biocompatible Materials; D004129:Dimethylpolysiloxanes; D009757:Nylons; C085707:poly(dimethylsiloxane)-polyamide copolymer