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Sources of error in AC measurement of skin conductance Cover

Sources of error in AC measurement of skin conductance

Journal of Electrical Bioimpedance
Volume 6 (2015): Issue 1 (January 2015)
By: Ørjan G.Martinsen,  Oliver Pabst,  Christian Tronstad and  Sverre Grimnes  
Open Access
|Dec 2015

Figures & Tables

Figure 1

Electrical model of skin
Electrical model of skin

Figure 2

Conductance G and Susceptance B (150 mV rms) as a function of frequency for two palmar Kandall KittyCat® electrodes. The measurements are done for two different levels of sweat activity. Average and standard deviation of 20 measurements for each of the two levels.
Conductance G and Susceptance B (150 mV rms) as a function of frequency for two palmar Kandall KittyCat® electrodes. The measurements are done for two different levels of sweat activity. Average and standard deviation of 20 measurements for each of the two levels.

Figure 3

Simultaneous measurement of AC conductance and susceptance (20 Hz, 500 mV peak amplitude) and DC conductance (500 mV) on the right palmar skin site during excitation (combing through the test subject’s hair). These measurements are done in parallel to the measurements shown in figure 2. It shows the test subject’s EDA during the whole session (20 frequency scans).
Simultaneous measurement of AC conductance and susceptance (20 Hz, 500 mV peak amplitude) and DC conductance (500 mV) on the right palmar skin site during excitation (combing through the test subject’s hair). These measurements are done in parallel to the measurements shown in figure 2. It shows the test subject’s EDA during the whole session (20 frequency scans).

Figure 4

Simultaneous measurement of AC conductance and susceptance (20 Hz, 500 mV peak amplitude) and DC conductance (500 mV) on the right palmar skin site during relaxation. These measurements are done in parallel to the measurements shown in figure 2. It shows the test subject’s EDA during the whole session (20 frequency scans).
Simultaneous measurement of AC conductance and susceptance (20 Hz, 500 mV peak amplitude) and DC conductance (500 mV) on the right palmar skin site during relaxation. These measurements are done in parallel to the measurements shown in figure 2. It shows the test subject’s EDA during the whole session (20 frequency scans).

Figure 5

The three-electrode electrical admittance measuring system, showing measuring (M), reference (R) and current carrying (C) electrodes on the skin (left) and with skin impedance and DC potential (right).
The three-electrode electrical admittance measuring system, showing measuring (M), reference (R) and current carrying (C) electrodes on the skin (left) and with skin impedance and DC potential (right).

Figure 6

Examples of simultaneously measured skin potential and conductance. From [3] with permission. Top: Highly correlated potential and conductance curves. Bottom: Example of biphasic potential curves.
Examples of simultaneously measured skin potential and conductance. From [3] with permission. Top: Highly correlated potential and conductance curves. Bottom: Example of biphasic potential curves.

Figure 7

Skin surface conductance density at 22 Hz measured with Kendall Kittycat® solid hydrogel electrode (A) and Ambu Blue Sensor® Q-00-A wet gel electrode (B) on hypothenar skin sites. From [14]. © Institute of Physics and Engineering in Medicine. Reproduced by permission of IOP Publishing. All rights reserved.
Skin surface conductance density at 22 Hz measured with Kendall Kittycat® solid hydrogel electrode (A) and Ambu Blue Sensor® Q-00-A wet gel electrode (B) on hypothenar skin sites. From [14]. © Institute of Physics and Engineering in Medicine. Reproduced by permission of IOP Publishing. All rights reserved.

Figure 8

Skin surface conductance density at 22 Hz measured with Kendall Kittycat® solid hydrogel electrode (A) and Ambu Blue Sensor® Q-00-A wet gel electrode (B) on the abdomen. From [14]. © Institute of Physics and Engineering in Medicine. Reproduced by permission of IOP Publishing. All rights reserved.
Skin surface conductance density at 22 Hz measured with Kendall Kittycat® solid hydrogel electrode (A) and Ambu Blue Sensor® Q-00-A wet gel electrode (B) on the abdomen. From [14]. © Institute of Physics and Engineering in Medicine. Reproduced by permission of IOP Publishing. All rights reserved.
DOI: https://doi.org/10.5617/jeb.2640 | Journal eISSN: 1891-5469
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Language: English
Page range: 49 - 53
Submitted on: Dec 8, 2015
Published on: Dec 29, 2015
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Electrodermal activity,
galvanic skin response,
skin conductance,
bioimpedance
Related subjects:
Engineering,
Bioengineering and biomedical engineering,
Biomedical electronics,
Life sciences,
Biophysics,
Medicine,
Biomedical engineering,
Physics,
Spectroscopy and metrology

© 2015 Ørjan G.Martinsen, Oliver Pabst, Christian Tronstad, Sverre Grimnes, published by University of Oslo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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