I found this webpage:
http://biology.clemson.edu/bpc/bp/Lab/110/reaction.htm#DistractionWelford (1980) and Broadbent (1971) reviewed studies showing that distractions increase reaction time. Trimmel and Poelzl (2006) found that background noise lengthened reaction time by inhibiting parts of the cerebral cortex. Richard et al. (2002) and Lee et al. (2001) found that college students given a simulated driving task had longer reaction times when given a simultaneous auditory task. They drew conclusions about the safety effects of driving while using a cellular phone or voice-based e-mail. Horrey and Wickens (2006) and Hendrick and Switzer (2007) had similar conclusions about cell phone use while driving, and said that hands-free phones did not improve reaction time performance. Reaction time suffered more than tasks like keeping in the right lane. Redfern et al. (2002) found that subjects strapped to a platform that periodically changed orientation had slowed reaction time before and during platform movement. The reaction time to auditory stimuli was more affected than response to visual stimuli. Hsieh et al. (2007) found that simulated vibration of a computer monitor increased reaction times to stimuli presented on the monitor, worsened error rates, and caused more visual fatigue. The effect of distraction may depend on emotional state and prior experiences. Reed and Antonova (2007) frustrated some subjects by giving them unsolvable problems, and then tested the reaction times of all the subjects with distraction. Subjects who had been given the difficult problems were more slowed and distracted than subjects who had not been frustrated before the reaction time measurement. Similar results were cited by Gerdes et al. (2008), who found that subjects who were phobic about spiders had their reaction time slowed more by distracting pictures of spiders than by distracting pictures of objects like flowers and mushrooms. This was caused by the phobic subjects' failure to look away from the spider pictures as fast as they looked away from the other pictures. Martinie et al. (2010) found that being forced to write an essay defending opinions that the writer did not really share actually improved reaction time, possibly due to increased arousal.
how to setup this experiment this is the alternative that i have
Has the depolarization started or finished in the ventricles when the av valves close? what is the temporal relationship between the closure of the av valves and teh ventricular depolarization and repolarization.
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