Subject: What are the relative strengths of visual and auditory stimuli to humans?

Please refer me to a study or studies of whether visual or auditory 
stimuli are stronger in capturing a human's attention. Has anyone 
done experiments to determine if, when presented simultaneously with 
visually displayed information and different aurally delivered 
information, a subject will pay more attention to one or the other? 
My guess is that visual stimuli are much stronger than auditory 
stimuli, but I need to have scientific evidence to back this up.

Thank you for your consideration of this question.

Re: What are the relative strengths of visual and auditory stimuli to humans?