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To investigate the effect of Caffeine/Nicotine on reaction times. Introduction. Caffeine is an alkaloid present in the leaves of certain plants such as coffee and tea. It is known to be a stimulant, which perhaps has the effect on individuals of keeping them awake or making them more alert. Caffeine has been shown to increase the heart rate immediately after consumption and then having a time lag before the heart rate returns to its normal pattern. Other associated physiological processes are similarly affected for example the rate of respiration Nicotine is also an alkaloid but rather more severe in it's action in that it can be habit forming. Individuals speak of being calmed down though the intake of nicotine plus a feeling of well-being involved in the activity, this chemical therefore should have a bearing on reaction times particularly if the individual was in a state of tension before consuming the nicotine. Aim: The...

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