PROBLEM ABOUT GALVANIC SKIN SENSOR (GSR) TERMS

Hi! Can you please help me with the term in Galvanic Skin Response (GSR) which are resistance, conductance and conductance voltage? what does it mean actually for each term? please give clear explanation or link or any reference that I can refer to.. its quite confusing with the term and the value.. Here is the image of my programme

Any help appreciated. Thanks.

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