title: Novel dry electrodes for recording electrodermal activity.
abstract: Novel carbon/salt adhesive (CSA) electrodes have been found suitable for collecting electrodermal activity (EDA) signals. Ag/AgCl electrodes are considered the standard for collecting EDA signals, because it highly avoids electrodes' polarization. Ag is an expensive commodity. Furthermore, a hydrogel layer is needed for the Ag/AgCl electrodes to collect EDA signals. Adding hydrogel to the electrodes is a cumbersome process. Aforementioned circumstances highlight the need for a more accessible media to collect these signals, allowing EDA use to spread. Dry electrodes made with a mixture of carbon, salt and adhesive has shown to be suitable for collecting bioelectric signals. We have implemented a constant DC-source EDA circuit, with the intention of testing how these electrodes perform for collecting EDA signals. Recruited subjects (N=4) underwent a test including electric shocks, watching a disturbing video and performing the Stroop task. Time and frequency domain correlation were computed. For the obtained skin conductance responses (SCRs), amplitude, onset-to-peak time, and onset difference between the CSA and Ag/AgCl electrodes' acquired SCRs were computed. We found no significant differences on SCRs amplitude and onset-to-peak time between CSA and Ag/AgCl. Furthermore, the difference in onset time for simultaneous SCRs obtained using both media was not different to zero. We conclude that CSA electrodes are a suitable surrogate of Ag/AgCl electrodes for collecting EDA signals on healthy subjects using the implemented DC circuit.
authors.forename: Hugo F
authors.initials: HF
authors.lastname: Posada-Quintero
authors.forename: Ryan
authors.initials: R
authors.lastname: Rood
authors.lastname: Yeonsik Noh
authors.forename: Ken
authors.initials: K
authors.lastname: Burnham
authors.forename: John
authors.initials: J
authors.lastname: Pennace
authors.forename: Ki H
authors.initials: KH
authors.lastname: Chon
mesh_terms: D000269:Adhesives; D002244:Carbon; D004566:Electrodes; D004568:Electrodiagnosis / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D005712:Galvanic Skin Response; D006801:Humans; D008297:Male; D012492:Salts
chemical_list: D000269:Adhesives; D012492:Salts; D002244:Carbon