The experiment investigated the orienting response as a function of temporal relations among the stimuli, with GSR the measure. 3 stimuli were employed. The duration of the 1st was 1300, 1050, or 750 msec., with 2 groups at each interval. The duration of the 2nd and 3rd were 600 and 100 msec., respectively. They terminated together and consisted of a tone and 2 different lights. Following 10 presentations of the compound, separate groups were tested to the 1st or 2nd stimulus alone. The shift from triple stimulation to single produced a significant increase in GSR magnitude and also a significant interaction between order and original precedence time. (PsycINFO Database Record (c) 2006 APA, all rights reserved)