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EDA Finger Transducer, BSL

Transducer for Life Science Education

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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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BIOPAC Physiology Teaching Tools
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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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Fundamentals of Physiological Data Recording

Basic principles of physiological data collection covers fundamentals of data collection and equipment configuration equipment to help you refine experiment protocols and avoid costly missteps. Frazer Findlay, CEO of BIOPAC, discusses common mistakes with physiology recording and shares his secrets for collecting great data. Topics include: How to prep a subject and where to place electrodes; Which type of electrodes work for different body signals; Analog to Digital Conversion; Sample rates (correct vs. incorrect); Filtering; and Scaling and calibration.
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