Instead of a single UCS, three UCSs (an electric shock, a flash of light, and a loud tone) were used in a differential GSR conditioning study. Conditioning was successfully established by pairing the CS+ with a different UCS on each conditioning trial.
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References
1.
KimmelH. D.PennypackerH. S.Differential GSR conditioning as a function of the CS-UCS interval. J. exp. Psychol., 1963, 65, 559–563.
