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  1. EDA stands for Electrodermal Activity whereas SCR stands for Skin Conductance Response
  2. From the AcqKnowledge home screen select: Open a graph file, Graph file on Disk, and click OK
    1. This will allow you to access files directly from the UT: Drive


  3. Minimize all other channels except Channel 10 which corresponds to EDA by clicking on the triangle icon on the left hand slide of the channel number.


  4. Autoscale waveform horizontally using the autoscale feature on the toolbar
    Image Added

  5. Access the EDAPreference Preferences menu by going to Analysis→ Electrodermal Activity→ Preferences ... & enter the following settings:
    2. Click OK
    3. *Note: we can choose to Reject SCRs under 0% of max (Review Analysis Menu)

  6. Add a Dual Row x 3 to toolbar by clicking on the Pre-Set menu icon (triangle facing down)



    2. Change Min, Max, & Mean values to None


  7. Go to Analysis →
    Electrodermal Activity → and select "Derive Phasic EDA from Tonic" from the menu options.




    2. Scroll down and select Channel 10 to indicate the correct EDA (SCL) signal


  8. The Tonic EDA signal (Channel 10) is now accompanied by a Phasic signal (blue) providing precise information on time-based changes in EDA


  9. Go to Analysis→
    Electrodermal Activity→ and select "Locate SCRs" from the menu


  10. From the Locate SCRs menu, select Channel 10 as the Tonic EDA channel and select the Phasic EDA channel (Channel 7 in this example) under the Use Channel Option


  11. SCRs are now displayed on the Tonic Channel


    2. Using the magnifying glass tool, zoom into a small region of the EDA channel.
      1. Using your cursor, click on the a small region in the waveform and drag. A blue selection box will appear, indicating that your are expanding/zooming into this specific region.
        1. Open- brackets indicate: SCR onset
        2. Water-droplet indicate: Peak SCR response
        3. Closed bracket: SCR offset/ end of SCR
        4. Blue Droplet: an SCR that is significant from its background but not tied to a specific stimulus; referred to as a Non-specific-SCR (NS-SCR)
        5. Red Droplet: Event-Related SCR

  12. Determine measurements you'd like to capture: Mean Amplitude of Events (Evt ampl), number of Events, Event-Related EDA analysis