Investigating the visual span in comparative search: the effects of task dif®culty and divided attention
|Abstract||In three experiments, participants' visual span was measured in a comparative visual search task in which they had to detect a local match or mismatch between two displays presented side by side. Experiment 1 manipulated the dif®culty of the comparative visual search task by contrasting a mismatch detection task with a substantially more dif®cult match detection task. In Experiment 2, participants were tested in a single-task condition involving only the visual task and a dual-task condition in which they concurrently performed an auditory task. Finally, in Experiment 3, participants performed two dual-task conditions, which differed in the dif®culty of the concurrent auditory task. Both the comparative search task dif®culty (Experiment 1) and the divided attention manipulation (Experiments 2 and 3) produced strong effects on visual span size. q 2001 Elsevier Science B.V. All rights reserved.|
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