The Relationship of EDA to Electrode Size

The pari passu relationship between contact area of electrode and SCLs and SCR amplitudes which is predicted on the basis of current electrical models of EDA was investigated in a series of experiments employing a wide range of commonly used contact areas: .017 to .786 cm 2 (.15 to 1.0 cm diameter). Having systematically eliminated obvious methodological and procedural problems a nonmonotonic relationship remained. On the basis of these findings two recommendations were made: 1) the use of an intermediate size, .5 cm 2 (.80 cm diameter), of electrode in recording EDA; 2) SCLs and SCR amplitudes should be reported in terms of actual electrode size rather than specific conductance units as previously suggested. No effect of electrode size was found for time‐based measures of EDA. Results are discussed in terms of practical implications.