Not the site that I am looking for. Go too
http://www.nsc.org/library/shelf/inincell.htm
Part of
These data demonstrate that the phone conversation itself resulted in significant slowing in the response to simulated traffic signals, as well as an increase in the likelihood of missing these signals. Moreover, the fact that hand-held and hands-free cell phones resulted in equivalent dual-task deficits indicates that the interference was not due to peripheral factors such as holding the phone while conversing. These findings also rule out interpretations that attribute the deficits associated with a cell phone conversation to simply attending to verbal material, because dual-task deficits were not observed in the book-on-tape control. Active engagement in the cell phone conversation appears to be necessary to produce the observed dual-task interference.
The principal findings for this experiment are that: (a) SPs that engaged in cell phone conversations missed twice as many simulated traffic signals as when they were not talking on the cell phone, (b) SPs took longer to react to those signals that they did detect, and (c) these deficits were equivalent for both hand-held and hands-free cell phone users.
In sum, we found that conversing on either a hand-held or hands-free cell phone led to significant decrements in simulated driving performance. We suggest that the cellular phone use disrupts performance by diverting attention to an engaging cognitive context other than the one immediately associated with driving.
Our data suggest that legislative initiatives that restrict hand-held devices but permit hands-free devices are not likely to reduce interference from the phone conversation, because the interference is, in this case, due to central attentional processes.
End
This last sentance is as close as I can find that confirms the findings on the other site.
Skyryder
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Originally Posted by Zed
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