EDA SCR Event Related Analysis tutorial and primer available

AcqKnowledge software for  MP160, MP150, and MP36R research systems includes a fully-automated electrodermal activity (EDA) data scoring routine. The feature includes options for deriving phasic EDA from tonic EDA, locating skin conductance responses (SCR), and event-related EDA analysis.

• Watch the tutorial video now:

• Read the primer on EDA protocols and analyses to go from data acquisition to meaningful results in a few basic steps:

A Guide for Analysing Electrodermal Activity (EDA) & Skin Conductance Responses (SCRs) for Psychological Experiments (Dr Jason J Braithwaite, Dr Derrick G Watson, Robert Jones, Mickey Rowe; compiled 2013).

BIOPAC’s event-related EDA analysis works in conjunction with a Digital input to stim events feature. The Digital input to stim events function works with TTL trigger information coming from applications such as Superlab®, E-Prime®, DirectRT®, MediaLab®, Inquisit®, and Presentation®. It converts TTL data acquired on the digital channels of an MP device into stimulus events. Stimulus delivery events are defined in the graph for each low to high transition of the digital data, the indications of stimulus delivery. The digital channels are interpreted as a binary number. Each stimulus event placed into the graph has the corresponding number included with its label. The event-related EDA tool locates the stimulus events and looks for an SCR that falls within a time window after the stimulus was presented to the subject.

The following measures are extracted from the electrodermal activity data:

• Stimulus Delivery Time—Time within the recording where the stimulus delivery event was located.
• Skin Conductance Level (SCL)—Amplitude of the tonic EDA signal at the time the stimulus was delivered.
• Response Latency—Time separating the stimulus delivery from the onset time of the corresponding SCR.
• SCR Amplitude—Height of the corresponding SCR as determined by the change in the tonic EDA from the time of SCR onset to the maximum tonic EDA amplitude achieved during the SCA.
• SCR Rise Time—Time taken for the tonic EDA to reach its maximum value within the SCR.

Click here to learn more about BIOPAC EDA solutions.