Effect of UCS strength on GSR conditioning: A within-subject design.

Abstract
Using a within-S design-20 Ss had one CS (light or tone) associated with a strong UCS (2.5-ma. shock) for 10 trials, and the other CS (tone or light) associated with a weaker UCS of 1.5 ma. The inter stimulus interval was 1 sec. and the response measured was the GSR. The data during training and extinction indicate a clear superiority of the strong over the weak UCS-associated CS. The results are contrasted with a comparable between-S design where differences failed to reach significance, and the use of a within-S design for the GSR is recommended whenever possible.

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