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This research was taken place in order to investigate whether caffeine intake will affect the reaction time of an individual, depending on the amount of caffeine that was consumed.

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________________ Introduction: Caffeine is a mood-shifting drug that stimulates human behaviour in many ways by influencing mood and personality. Research has shown that caffeine boosts one?s level of mental arousal, especially where awareness fades in the absence of caffeine intake. Examples include, rising up in the morning and working overnight shifts whilst increasing daytime alertness. Caffeine users may adversely react to stressful situations and not be able to effectively deal with them. Excessive amount of caffeine can interfere with sleeping patterns which may lead to insomnia. These effects are caused by the influence of caffeine over neurotransmitters. These include decreasing their synthesis or by imitating their activity or, by blocking their action at the receptor site. Neurotransmitters are altered by caffeine in a variety of ways, including increasing or decreasing their synthesis, modifying their storage or simply by directly imitating their activity or, alternatively, by blocking their action at the receptor site. Since a primary function of a neurotransmitter is to make us tired or sleepy, caffeine, blocks the acceptance of adenosine, which keeps us from feeling fatigue. Does caffeine affect one?s reaction time? This research was taken place in order to investigate whether caffeine intake will affect the reaction time of an individual, depending on the amount of caffeine that was consumed. ...read more.


A participant variable can also be the placebo effect. Other variables that may have influenced the reaction time of participants include: The participant variables would have affected the results obtained due to the smaller sample size. If the sample size was bigger, it would have balanced these variables out. 1. Arousal- Reaction time is fastest with an intermediate level of arousal, and deteriorates when the subject is either too relaxed or too tense 2. Left or right hand- The left hemisphere is regarded as the verbal and logical brain, and the right hemisphere is thought to govern creativity, spatial relations, face recognition, and emotions. The left hemisphere controls the right hand and the right hemisphere controls the left hand. 3. Practice and errors- Participants are new to a reaction time task; their reaction times are less consistent than when they've had an adequate amount of practice. 4. Fatigue- Reaction time gets slower when the participant is fatigued. 5. Distraction- Distractions increase reaction time, e.g., background noise. 6. Exercise- Exercise can affect reaction time. Studies show that the physically fit have lesser reaction times. 7. Illness- Sickness or infections slow reaction time. Strengths- Since a single blind procedure was used in this investigation, it eliminated the placebo effect, hence participants were unaware of the condition to which they were assigned. ...read more.


Informed consent- Prior to the investigation, participants were appropriately informed of the type and reason for the investigation and informed consent was appropriately documented through a consent form. Parental consent was also involved for participants under the age of sixteen. Deception- Deception wasn?t involved in this investigation as participants were informed about the investigation which may influence their behaviour. Debriefing- Participants were informed of the purpose of the investigation at the end. Participants were provided with information regarding the investigation including its procedures and results. Overall, all the ethical standards were met in this investigation. It was ensured that no psychological or physical harm were experiences by the participants while respecting their rights as individuals. Since the participants were aware of what the real study was investigating, the disposition of the participants may have not been very natural as they knew it was their role that was being investigated. There might have been the placebo effect amongst students as they knew they were being investigated. The information obtained from this experiment showed that caffeine does affect reaction times of students aged 15-16, however many variables need to be taken into consideration in this type of investigation. Though this data is not valid for the whole population, a vague idea can be perceived as to how caffeine affects an individual. ...read more.

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