The Sternberg additive factor method was used with 64 right-handed undergraduates with normal or corrected hearing and vision to draw inferences about the flow of information under single- and dual-task conditions that were identical in terms of the stimuli involved but different in terms of response requirements. In both conditions, Ss pressed a left- or right-hand key in response to the onset of an X or O (intact or degraded) that was accompanied by a monaural or binaural tone. In the dual-task condition, Ss responded verbally to the tone location while also making the keypress response; in the single-task condition, no response to the tone was required. Results suggest that in the dual-task condition processing capacity was shared at the response selection stage and not at the stimulus encoding stage. This suggests that the auditory location cue affected the mechanism involved in selecting responses to the visual stimulus and not the mechanisms involved in encoding the visual stimulus. (40 ref) (PsycINFO Database Record (c) 2004 APA, all rights reserved)
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