Fig 1.
Electrodermal activity with detected skin conductance responses (SCR) (marked with black dots).
Fig 2.
Via electrodes (black) DC exosomatic measuring instrument applies a DC voltage of up to U = 1 V to the skin.
By measuring the ratio of applied voltage U and resulting current I skin conductance G can be calculated (G = I / U).
Fig 3.
Typical raw EDA signal (solid line) of a participant during a mental task (dashed line).
Fig 4.
Raw acquired EDA signal during testing of a dual sensor EDA device (two electrodes acquisition waveforms are represented by the white and red line).
After first 100 seconds EDA device was tested using a fixed resistor of 54 kΩ, corresponding to 18.5 uS (encircled).
Fig 5.
Skin conductance versus time–an example of an EDA simulator output.
2 uS electrodermal signal was generated, which increased to 7.2 uS with four superpositioned 0.25 uS SCRs, occurring with 5/min frequency.
Fig 6.
EDA simulator circuit schematics.
Fig 7.
(a) EDA simulator with active finger electrodes on index and middle fingers; (b) testing of an EDA device with its clamp electrodes attached to simulator.
Fig 8.
Schematics of real physiological waveform (left) and artificially generated output waveform of an EDA simulator (right).
Fig 9.
EDA device acquisition of skin conductance, generated by EDA simulator during static calibration.
In time interval marked with dashed lines, EDA device was measuring a fixed 100 kΩ (10 uS) resistor.
Fig 10.
EDA device acquisition of skin conductance, generated by EDA simulator.
Simulator generated SCRs of different frequencies (5 SCR per min, 10 SCR per min and 20 SCR per min).
Fig 11.
EDA device acquisition of skin conductance, generated by EDA simulator.
Simulator generated SCRs of different amplitudes (0.25 uS and 0.45 uS).
Table 1.
Stability of the EDA simulator output (all values in uS and measured within a 10 min interval).