This paper presents the results of a study addressing the effect of hands-free cellular phone conversation complexity on choice response time in a detection task. The study utilized an open-loop simulation technique to study four different levels of the secondary task of using a hands-free cellular telephone and their effect on the primary task of responding to stimuli presented through a driving scene. Results from the study showed that the inclusion of the secondary task had a significant effect on choice response time. Also, choice response time associated with complex conversations involving visual scanning was found to be significantly different from that when the phone was not used. The implications of the use of hands-free phones are also discussed.
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