AcqKnowledge® includes a fully-automated suite of tools for Event Related Electrodermal Activity applications. The analysis is based around the timing marks that come from stimulus presentation systems (Superlab®, E-Prime®, DirectRT®, MediaLab®, Inquisit®, Presentation®, etc.), plus virtual reality (Vizard®), and the SMI® Eye Tracking stimulation software. The stimulus presentation systems output TTL event marks to pinpoint when discrete stimuli are presented to a subject (visual cue, tone, image, mechanical, electrical, olfactory, light stimulation, etc.) and the MP device records them on digital channels. The Digital Input to Stim Events utility converts the TTL pulses into usable stimulus events for further analysis.
Digital Input to Stim Events identifies and labels stimulus events corresponding to any combination of TTL pulses on the digital inputs. A light bulb icon is placed in the global events bar, the event is labeled with the stimulus event type, and the mouse-over tag includes the event time. All event information is accessible and exportable from the Event Palette. The utility can also convert manual events located in any of the analog channels to stim events.
Once a file contains stimulus events, it’s possible to run the Event-Related EDA analysis routine.
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A file must contain both tonic and phasic EDA waveforms. AcqKnowledge will either create a phasic skin conductance response signal from the tonic skin conductance level data, or use an existing waveform.
If a phasic signal is not present in the file, AcqKnowledge uses either baseline smoothing or high pass filtering to construct a new Phasic EDA channel. This routine is automatically included in both the locate SCR and Event-Related EDA routines.
Once a file contains both a phasic and tonic waveform, the software identifies skin conductance responses and visually scores the waveform. All SCR events are marked on the tonic waveform. The software marks the event onset, SCR point of max response, and waveform end. Responses can also be manually adjusted using the event marking tools.
AcqKnowledge will then look for stimulus events and determine whether an SCR occurs within a user-defined time window after the stimulus was presented to the subject. If an SCR is present, the software will mark it as a Specific Skin Conductance Response (SSCR) by coloring the water drop red and displaying a flag with the stimulus type above the water drop. Skin conductance responses that fall outside of the window are marked as Nonspecific Specific Skin Conductance Responses (NSSCR). Nonspecific responses do not have the red water drop present, they just have the blue drop to identify a skin conductance response.
The analysis provides the following results.
EDA - SCR Event Related Analysis
Focus Areas | Use Find Cycle to Create around Digital Events
Digital Input to Stim Events
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MP36R System
Wired | Event-Related EDA Analysis
MP36R with AcqKnowledge plus EDA lead set with disposable EDA electrodes & isotonic gel
MP36R System
Wired | Event-Related EDA Analysis
MP36R with AcqKnowledge plus EDA finger transducer and gel
MP160 System
Wired | Event-Related EDA Analysis
MP160 with AcqKnowledge plus EDA amp with reusable EDA electrodes
MP160 System
Wired | Event-Related EDA Analysis
MP160 System with EDA amplifier, electrode leads, and disposable electrodes
MP36R System
MP36R System
MP160 System
MP160 System
BioNomadix Logger with EDA
Wireless | Event-Related EDA Analysis
BioNomadix Logger with AcqKnowledge plus BioNomadix wireless EDA transmitter with disposable electrodes
MP160 System
Wireless | Event-Related EDA Analysis
MP160 with AcqKnowledge plus BioNomadix wireless EDA with disposable electrodes
BioNomadix Logger with EDA
MP160 System
MP160 System
MRI | Event-Related EDA Analysis
MP160 with AcqKnowledge plus EDA amp & disposable radiotranslucent electrodes for MRI
MP160 System
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