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Which of the following instrument is used for measuring the average activity of sweat glands?

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Which of the following instrument is used for measuring the average activity of sweat glands?

(a) EOG

(b) ECG

(c) GSR

(d) PCG

This question was posed to me at a job interview.

My question is based upon Cardiac Arrhythmias in chapter Arrhythmia and Ambulatory Monitoring Instruments of Biomedical Instrumentation

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The correct option is (c) GSR

The best I can explain: Electrodermal activity is measured in two ways: BSR (basal skin response) and GSR (galvanic skin response) is a measure of the average activity of the sweat glands and is a measure of the phasic activity (the high and low points) of these glands.

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