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Visual Blind Spots could affect if you can tell if something is coming towards you.

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Something that could affect how fast i respond is if i consumed caffeine that day or not, such as coffee or energy drinks. Another factor could be eye sight, someone with good vision could react faster compared to someone with bad or worse vision.

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If a person plays video games all the time or not

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If a person plays video games all the time or not

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I believe that those play video games may have a faster reaction time than those who do not. These people have trained their reaction time to be quicker and react to things in games. They are also more advanced in using their keypad to react quicker.

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When I stay in the cold for too long without gloves, my hands and fingers move really slow.

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how fast someone is able to react to a situation is a dependent variable

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The consistent usage of psychedelic drugs or use at the time of the test, can hinder brain functioning which can affect reaction time.

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I think that people who consume caffeine on a regular basis will have greater alertness and faster neuromuscular reaction time than those who do not .

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I notice that when I went to bed late or didn't get enough sleep, my movements throughout the day tend to be more sluggish and delayed. You could test reaction time in being wide awake and well rested VS. tired and fatigued.

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I belive that if someone had about 6-8 hours of rest and they have trained this before, or played any games when they were growing up, they'd have more training and their reaction times will be quicker.

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Wakefulness, anxiety, dominance of hand being used, musculoskeletal conditions... 

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Wakefulness, anxiety, dominance of hand being used, musculoskeletal conditions... 

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Where subjects are located could effect reaction time. If the subject is completed the test in a public settings vs. from the privacy of their home, they could be more likely to perform based on how comfortable they are being perceived. How comfortable they are could effect how relaxed their muscles and joints are and either slow or speed up their reaction time.

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Medical conditions

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I believe that the ability to do something to your greatest ability is greatly affected by mental fatigue and because of that, the more energized you are the more likely you are to do better at certain everyday tasks such as running, doing homework, reading, etc.

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When people get excited or maybe scared, their adrenaline can make them more alert and ready to react.

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Sleep Deprivation Affects Reaction Time 

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Sleep Deprivation Affects Reaction Time 

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Someone who sleeps less amount of time every night may react slower than someone who sleeps a healthy amount of time every night.

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If a person blinks a lot, maybe they might miss milliseconds of a change, like the light turning green.

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how fast someone processes stuff

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Certain hobbies, such as playing first-person shooter video games that require good hand-eye coordination and quick reaction times, can contribute to someone having a faster reaction time with clicking a mouse to perform this task.

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Practiced agility and whether or not they are using their dominant hand 

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Practiced agility and whether or not they are using their dominant hand 

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If someone has already been exposed to tests or activities like these before, then they may perform better

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If someone has more experience acting quickly and identifying visual cues easier, they may react quicker than someone who doesn't have a ton of experience reacting quickly and efficiently

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Age of who is clicking the button as well as distance from the button.

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One of the main factors that could potentially alter the experiment is how well someone can actually see. If someone has poor eyesight, it makes sense they would likely have a slower reaction time.

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Ages 30+, from what I've heard anecdotally, are generally associated with a decrease in high-dexterity reaction times. Another factor, often associated with aging, is the presence/absence of painful nerve conditions that might impair reaction times.

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I believe that participant's reaction times would change based on the amount of sleep they got in the past 24 hours. One group could have gotten no sleep in the past 24 hours and the other group could have gotten at least 8 hours.

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Some people aren't conscious or aware of the fact they perceive color differently than others, although this could be attributed to just eyesight in general, in the stoplight example provided it was a bit difficult to notice when the lights were changing because it all looked illuminated the same, the color change was minor. Many people are colorblind and may not be able to tell the subtle difference in tone when the color changes.

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A variable that could affect reaction time could be the quality of eye sight, for example if someone is wearing their glasses or contacts if they should be.

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Distance from screen could be an interesting independent variable to test. The green light is small so I wonder if someone closer to the screen would have a faster reaction to the light.

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Whether or not someone played or plays a sport!

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Whether or not someone played or plays a sport!

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Those who play or have played a sport may have better hand-eye coordination than those who never have.

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The difference between using a mouse or a touchpad.

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The difference between using a mouse or a touchpad.

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outside distraction like television, music, cars outside ect

which hand you are using

wifi connection(lag on response)

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amount of distraction

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The reason why hand dominance matters is because using your dominant hand you have more control over it than your nondominant hand. Therefore, your dominant hand will respond quicker than the nondominant.