Electrodermal activity

The following algorithms are based on EDA signals that are acquried by the movisens sensors edaMove, EdaMove 3, or EdaMove 4.

The following figure shows the signal waveform of a typical skin conductance response (SCR) and the secondary parameters that can be calculated.

Typical skin conductance reaction (SCR)

Notes for the detection skin conductance responses:

  1. SCR are detected automatically, making the specification of an event marker neither necessary nor possible.
  2. The default minimal rise time for the detection of SCR is 0.05uS/s.
  3. The default minimal amplitude for the detection of SCR is 0.1uS.
  4. The default maximal rise tome for the detection of SCR is 0.9s.
  5. Detection Parameters are based on Dawson 2000 and Boucsein 2012

Literature:

Mean Skin conductance level (EdaSclMean)

This parameter calculates the mean skin conductance level (SCL) in an adjustable output interval. The algorithm applies a low pass filter (0,1 Hz) to the EDA data. The unit is [µS].

movisensLIVE: EdaSclMean can be calculated live on the sensor.

Number of SCR (EdaScrCount)

This parameter calculates the number of detected skin conductance responses (SCR) in an adjustable output interval.

SCR amplitudes (EdaScrAmplitudes)

This parameter calculates the time points and amplitudes of each detected skin conductance responses (SCR). The unit is [µS].

SCR rise times (EdaScrRiseTimes)

This parameter calculates the time points and rise times of each detected skin conductance responses (SCR). The unit is [s].

SCR half recovery times (EdaScrHalfRecoveryTimes)

This parameter calculates the time points and the recovery times (to the half amplitude) of each detected skin conductance responses (SCR). The unit is [s].

SCR Energies (EdaScrEnergies)

This parameter calculates the time points and the energies (half product of amplitude and rise time) of each detected skin conductance responses (SCR). The unit is [µSs].

Mean of SCR Amplitudes(EdaScrAmplitudesMean)

This parameter calculates the mean amplitude of detected skin conductance responses (SCR) in an adjustable output interval. The unit is [µS].

Mean of SCR rise times(EdaScrRiseTimesMean)

This parameter calculates the mean rise time of detected skin conductance responses (SCR) in an adjustable output interval. The unit is [s].

Mean of SCR recovery times (EdaScrHalfRecoveryTimesMean)

This parameter calculates the mean recovery time of detected skin conductance responses (SCR) in an adjustable output interval. The unit is [s].

Mean of SCR energy (EdaScrEnergiesMean)

This parameter calculates the mean energy of detected skin conductance responses (SCR) in an adjustable output interval. The unit [µSs].

Mean Arousal (EdaArousalMean)

Arousal is a synthetic signal generated from secondary parameters of detected skin conductance responses (SCRs). A special slew limiter is used that reacts faster on rising signals than on falling signals. The mean arousal is calculated in an adjustable output interval. Please select an output interval of 30 seconds or larger for this parameter.

EDA text file export (ReportEdaText)

This generates the text file ‘Eda.txt’ that contains the time series of the raw eda signal. The values are comma separated. The unit is [uS].

Last Updated: 4/10/2019, 4:21:14 PM