Changes in information-selection patterns in multisource monitoring as a function of induced arousal shifts.

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Abstract
Used an observing response 3-source monitoring task in 2 experiments with 24 18-24 yr old Navy enlisted men in Exp I, and 12 19-24 yr old enlisted Ss in Exp II. An arousing treatment, loud noise, produced increased sampling of the source associated with a high fault probability, while sleep loss, presumed to decrease arousal level, resulted in a reduction of sampling on the high probability source. These changes in selectivity only occurred when Ss were restricted in their sampling rate by a pacing procedure. In addition, systematic changes were found in the detection of faults, once they were located on a particular source. Noise tended to remove the tendency to check sources twice (i.e., make repeat observations) before correcting the fault, while sleep loss increased the frequency of these uncertain responses. A possible relationship between the 2 kinds of effect is suggested, but the resulting changes in information-selection patterns clearly offer support to the idea of a monotonic increase in attentional selectivity with arousal. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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