a change in the electrical conductivity of the skin caused by an emotional reaction to a stimulus.
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British Dictionary definitions for galvanic skin response
a change in the electrical resistance of the skin occurring in moments of strong emotion; measurements of this change are used in lie detector tests: Abbreviation: GSR
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012