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Biopac EDA presentation slides
In order to establish a baseline against which responses will be compared/measured, we need a time window of resting right before responses start. Below you see the “EDA Preferences” window (Analysis → Electrodermal activity → Preferences) and the software asks how many seconds (or desired time unit) you want to use to establish the baseline. Let’s say, we are looking at the Stroop task (see below): instead of having regular individual events, we are looking at time periods that last up to several minutes. You can see that this person’s EDA starts to peak even before the beginning of the first Stroop block. Therefore, we need the time scale to start at least one minute, if possible more, before the task begins.
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Processing
· The little ‘I’ (info) button on the right hand bar of a channel is not there right after data collection, it only appears after something has been done to the data. You can check what has been done. This one shows that the data has already been resampled from 2,000Hz to 100Hz (Biopac samples everything at 2,000Hz by default)
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