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EDA (GSR) subject preparation

BIOPAC offers a variety of setups for recording electrodermal activity, including

The following general guidelines will improve the quality of data from any setup:

  1. Never abrade the skin.
    • Note: For MRI setups, lightly abrading the skin may sometimes help if the subject has particularly calloused fingers. Still, this is not recommended and should be used as a last resort only. See MRI Guidelines for additional information.
  2. If you clean the electrode site, do it with water for all subjects.
  3. Make sure you have enough gel on the electrodes. (Dry disposable electrodes will result in a deteriorated signal. Follow the storage guidelines for the electrodes to prevent them from drying out)
  4. Use isotonic gel. (If using disposable electrodes and they appear dry you can still use them by applying isotonic gel as long as the dry gel on the electrodes has not crystallized)
  5. Attach the electrodes 5-10 minutes before recording.

For more detailed information, see Guidelines – EDA, EDR, GSR, SCL, and SCR.

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