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14 human Ss were exposed for 60-sec. intervals to violet light and to green light, in alternating order, for a total period of 6 min. Electrical skin conductance was monitored throughout the session. The crucial measure was the galvanic skin response (GSR) occurring in the first 12 sec. of exposure to a given color. As predicted, GSR was greater to violet than to green.
Nourse et al. (Thu,) studied this question.