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In the preferences box, use the following settings:
THE SCR THRESHOLD LEVEL FROM THE BIOPAC CONFERENCE WAS 0.02; they recommend this but the threshold can also be lower.
BIOPAC ACTUALLY RECOMMENDS THE PHASIC EDA CONSTRUCTION CALLED “SMOOTHING BASELINE REMOVAL“
→ SECOND CHOICE IS HIGH PASS FILTER
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Go back to Analysis → Electrodermal activity → Construct phasic EDA from tonic
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If you see the following error, you need to adjust the threshold:
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ADD SCREENSHOT OF THE SIGNAL WITH MARKERS
EPOCH WIDTH IS A CHOICE. NEED TO FIND OUT WHAT CHOICE IS THE BEST.
Epoch analysis
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Event type: EDA → Skin Conductance Response
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EPOCH WIDTH OF 10 SEC SOUNDS CORRECT, THAT’S WHAT BIOPAC SUGGESTED
MIGHT CHANGE THIS TO “AFTER EVENTS”
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In the next window, you can the select what measures you want exported: Event count: how many SCRs were found in the focus area Value: the signal value at the marker location (or epoch onset location); this should theoretically be the same as Maximum Maximum: peak value of the SCR Minimum: this is important! You cannot interpret the amplitude of the SCR without considering the baseline!For example, your baseline might be 8.5 and the maximum 10.8 microsiemens. 10.8 microsiemens is NOT the amplitiude of the SCR! the amplitude is 10.8 minus 8.5 microsiemens. So we have to either request an amplitude measurement or subtract the minimum from the maximum. |
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Each epoch is one SCR and the values you requested in the previous step are listed in order.
WHY DOES IT SAY EVENT COUNT 2 for epoch 2?
Find cycle analysis (alternative)
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When you select Event amplitude, the following window pops up. We select “Amplitude at first event only”. This might cause the event amplitude and count to be zero.
When you select Event count, select where you want to look for the events and select your EDA channel that contains the water droplet markers.
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