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EDA Finger Transducer, BSL

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EDA Finger Transducer
Part #: SS3LA

The SS3LA transducer connects to a single MP3X input channel to record electrodermal activity EDA/GSR (skin conductance or, with proper setup *, skin resistance). Two Ag-AgCl electrodes are mounted in individual, ergonomically designed, polyurethane housings for improved contact; they attach to the fingers by a Velcro strap or can be taped to any other part of the body. The electrodes have a 6 mm diameter contact area with a 1.6 mm cavity to accommodate electrode gel. The non-polarizable electrodes are shielded to minimize noise interference and improve recordings.

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Part #: SS3LA
Categories: Transducers - Education, Transducers - Research
Subcategories: Electrodermal - Education, Electrodermal - Research

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Compatibility


BSL PRO software includes two EDA/GSR presets:

  • Electrodermal Activity (EDA/GSR), 0 – 35 Hz; requires calibration—see BSL Hardware Guide (under the Help menu or online) for details
  • Electrodermal Activity (EDA/GSR) Change; no calibration required

See the BSL Hardware Guide (under the Help menu or online) for details on how to verify the Gain setting of the SS3LA.

*Skin resistance setup: Use an Expression calculation channel to take the reciprocal of conductance and then apply proper scaling. See the Software Guide (under the Help menu or online) for setup details.

Usage Recommendations

There must be good electrical connections between the skin and the electrodes for EDA/GSR to work properly. When using GEL101 isotonic gel it is important that the gel has a chance to be absorbed and make good contact before recording begins. Accordingly:

  1. Apply GEL101 to the skin at the point of electrode contact and rub it in.
  2. Fill the SS3LA electrode cavity with GEL101.
  3. Attach the SS3LA electrode to the subject.
  4. Wait 5 minutes (minimum) before starting to record data.

See the SS57L EDA Lead for a disposable electrode option.

EDA “Electrodermal Activity” is also known as GSR “Galvanic Skin Response.” Use BIOPAC Electrodermal Activety (EDA) equipment to record Galvanic Skin Response (GSR) Data.

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Spotlight On
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Optimize Event-Related EDA

Electrodermal Activity (EDA) is an objective index for understanding emotional states. Researchers measure EDA to gain insights on psychological or physiological response, leading them down the path of scientific discovery. Because EDA is so important to research, BIOPAC has created tools to optimize event-related EDA analysis. Topics include: how to identify skin conductance responses, convert stim events from E-Prime SuperLab, Presentation, Vizard, etc., into AcqKnowledge events that can used for analysis, and score skin conductance responses using the AcqKnowledge automated EDA analysis tool.

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