Caffeine Investigation FolioCaffeine works similarly to the hormone adrenaline (Victoria Government, 2014) and increases dopamine levels, which makes you happy. It blocks adenosine receptors, preventing you from feeling sleepy (Staci, 2012). Caffeine also stimulates the brain, improving understanding, memory, reflexes and clarity of thoughts (Important Facts About Caffeine, 2011). The aim of the experiment is to test whether caffeine has an effect on psychological and physiological reaction times. This will be a beneficial experiment for regular caffeine consumers to determine whether caffeine will have a positive or negative effect on their alertness and reaction time. The hypothesis tested in the experiment will be: if caffeine is consumed, psychological and physiological reaction times will decrease. For the experiment, 30 women. 11 Psychology students will be asked, with informed consent, to record their psychological reaction times from the Stroop test - and their physiological reaction times from the Reaction Time test - with a timer, before and after consuming caffeine, collecting objective quantitative data. After collecting the data, it will be placed in two bar charts and interpreted. For Stroop and reaction time tests, reaction times are predicted to decrease with caffeine. It logically follows that caffeine will cause students to become more alert. Therefore, we conclude that caffeine consumption will lead to a decrease in psychological and physiological reaction times.Figure 1- The effect of caffeine on reaction test times on averageFigure 2- The effect of caffeine on reaction times of Stroop test on average Shown in Figu......middle of article......y, this experiment would be useful to caffeine consumers to determine whether caffeine will have a positive or negative effect on their alertness . Once the experiment is completed, it can be concluded that this investigation would serve as a useful reference for caffeine consumers interested in the effect of caffeine on psychological and physiological reaction times. However, the results will not be specific to them and must be generalized, at the risk of compromising the reliability of the results. That being said, this experiment will have introduced a method to test the effect of caffeine on psychological and physiological reaction times, which they can experience themselves. facts-about-caffeine/, http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Caffeine, http://visual.ly/important-facts-about-caffeine