Effects of instructions on the skin conductance response

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The effects of the task instructions, i.e. to attend to or to ignore stimuli, on skin conductance response (SCR) were examined. In Exp. I, 26 females were asked to count the number of particular digits visually presented while their SCRs were measured. In addition, a group of subjects was instructed to attend and count the number of tones (AT, N=10) whereas another group was to ignore those tones (IG, N=7). The rest of the subjects received no instruction about the tone (NI, N=9). The AT Group showed the largest SCR amplitude to the first tone, was the most responsive over the trials, and habituated most slowly among the three groups. In Exp. II, 31 females were simply told to read the digit-series silently. Subjects were then divided into three groups, and received either one of those three instructions about the tones same as in Exp. I (AT, N=11; IG, N=10; NI, N=10). Results obtained from the AT Group were similar to those in Exp. I. However, the effects of the task instructions were more salient in Exp. II than in Exp. I.
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