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Reflex Lab

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by

Saheeb Ahmed

on 12 June 2013

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Transcript of Reflex Lab

Introduction Materials and Methods Results Discussion References <The Reflex Experiment>
<Saheeb> Research Question Background Hypothesis Materials Procedure Graph Data Table Variables and Groups Set-Up How do different variables affect an individual's reflexes? How do different groups of people separated by variables such as age compare to each other in regards to reflexes? Reflexes are an important component of the human body. They cannot be simply called instinctive behavioral traits of humans because some reflexes are completely out of conscious control; some do not use the brain. For example: some of you may be familiar with the knee-jerk reflex. When a doctor taps the patellar tendon, sensory signals travel through a sensory neuron to the spinal cord. The signals then travel through synapses to motor neurons. These motor neurons bring the signal to the leg's extensor muscles which causes an involuntary kick. 3 different hypothesis for 3 different variables testing reflexes: If reflexes are compared during the morning and night, then the reflexes during the morning will be faster because the body has more energy to use because of what it stored during sleep. If reflexes are compared between various age groups, then the reflexes of the age group around age 20 will be the fastest because the group's neuron system and in general body will be more established. If reflexes are compared before and after exercise, then the reflexes after exercise will be faster because the body is working more and is more active from all the motion and blood pump. -Humans
-Computer or other internet accessing devices
-Treadmill
-Other Exercising Equipment Including:
Dumbbells
Jump Rope The primary and only reflex test I used was an online reflex test. In this online reflex test, you press start, move your mouse to the stop button which is right beside the start button, and wait until the color of a clear, white box above changes. Once the color changes, you press your mouse or tap your phone and a time will come up that states how fast your reflexes were. The equipments used in this reflex test are not important for two of the experiments because only the difference in times is necessary. However, consistency in what equipment is used for the two experiments is important. For the age reflex test, all of the test patients were provided the same electronic device. 1. Open up http://reflextest.net/reaction/color.htm in web browser.
2. Allow each individual to have 5 test runs to get used to the system.
3. Have each individual test their reflexes 10 times.
4. Find the average reflex time of each individual. Age Test 1. Open up http://reflextest.net/reaction/color.htm in web browser.
2. Allow each individual to have 5 test runs to get used to the system.
3. Have each individual test their reflexes 10 times.
4. Find the average reflex time of each individual.
5. Have each individual run on the treadmill in a pace that suits themselves but one that gives them the same amount of exercise that a different pace would give another individual.
6. Have each individual run for 12 minutes.
7. Directly after the 12 minute run, have each individual take the reflex test 10 times again, without any test runs.
8. Find the average reflex time of each individual. Exercise Test 1. Open up http://reflextest.net/reaction/color.htm in the web browser.
3. Have each individual test their reflexes 10 times.
4. Find the average reflex time of each individual.
[THE FOLLOWING MUST BE DONE AT NIGHT]
2. Allow each individual to have 5 test runs to get used to the system.
3. Have each individual test their reflexes 10 times.
4. Find the average reflex time of each individual.
[THE FOLLOWING MUST BE DONE IN THE MORNING]
5. Directly after waking up, have each individual test their reflexes 10 times.
6. Find the average reflex time of each individual. Time of Day Test Independent Variable: The individuals used in the test
Dependent Variable: The reflex times of the individuals Constants: The individuals used, the type of exercise used, the website used, the type of device used for the age group test, the type of device used in respect to each individual, similar environmental situations Each individual is put into similar situations than the others. Everyone is sitting down and is the same space away from the screen. A uniform way of pressing the stop button was used. The individuals' environment is quiet. No music is allowed while taking the reflex tests. No music is allowed during exercise. The results for the reflex tests before and after exercise show that reflexes are faster after exercise. This is evident because each of the individuals had a faster average time after exercising than before. For example: Individual 1 improved from having an average reflex time of .379 to .364. Individual 2 improved from having an average reflex time of .443 to .371. Individual 3 improved from having an average reflex time of .360 to .347. Individual 4 improved from having an average reflex time of .421 to .4. The hypothesis is supported because reflex times for the human body improved in all 4 individuals after exercise.

The results for the age test show that older human beings have better reflex times than younger humans. Two 13 year olds, one boy and the other girl, had reflex times .49 and .517. A 12 year old boy had a reflex time of .443. Two 17 year old males had reflex times of .379 and .36. A 19 year old male had a reflex time of .4. These results a clear difference between the ages of 13 and below, and 17 and above. The hypothesis is supported because reflex times for the older individuals were better than those of the younger individuals.

The results for the reflex tests during the night and morning show that reflexes are faster during the morning, directly after waking up. Individual 1 improved from night to morning from an average of .360 to .328. Individual 2 improve from an average of .392 to .37. Individual 3 improved from an average of .356 to .326. Individual 4 improved from an average of .379 to .364. This data supports the hypothesis that people in the morning will have better reflexes because of the clear improvement in reflex times. Although all of the three hypotheses were validated by the results of the experiment, there were many variables that may have led to misconstrued data and also different changes that could give better, more informative data. First of all, although paces were set for individuals based on their physical capabilities, there was no accurate way to detect heart beat. The treadmill that was used has a heart beat sensor, but due to its years of use and age of the treadmill, this heart beat sensor is most likely not very accurate. Some individuals may have been more active than others. There were also flaws in the reflex test itself. The color changed in the clear, white box, but it changed into different colors. The varying colors may have an impact on the reflex times of individuals due to how photoreceptors react to specific wavelengths of photons. In addition, the color changed at random times. This is helpful because people cannot guess when the color will change, but this also has a negative impact on the experiment. The color sometimes changed immediately after start was pressed. The children used for the experiment were very hyper; this may have led to inconsistent reflex times. For example: at times, it was necessary to calm them down and persuade them to try their hardest on the test. In order to gather better, more accurate results, various alterations could be made to the experiment. 4-6 individuals for each test are not nearly enough to produce a concrete conclusion about reflexes. Also, for the day and night reflex tests, tests were done based on only 1 night and 1 morning. Individuals may be feeling amazing one night and morning while others were feeling sick. Averages should be taken from various night and morning reflex trials. For the age experiment of the lab, not only should more people be used for data, but there should also be more variety in the ages used. There should be individuals around ages 30, 40, 50, etc. In the exercise reflex test, people of the same physique and physical fitness should be used in order to minimize the amount of variables such as pace. To add onto the data, reflexes should be tested after individuals go through different exercises like curls or push ups.
Visual reflexes such as the test for this experiment are different from reflexes like the knee-jerk reflex. Instead of a natural reaction in which you have no control over, conscious actions use the brain much more. In this experiment, light reflects off the computer screen and hits your eyes. This light enters the eye through the cornea. The eye is curved here, resulting in an upside down image of whatever is being looked at onto the back of our eyes, the retina. Only the back of the retina is photo-sensitive. The cells in the retina that allow us to see things in both color and detail are named rods and cones. Electric signals are sent towards the brain. The vision part of the cerebral cortex interprets the images and sends messages to the motor part of the cortex which runs down the spinal cord. From there motor neurons send signals to, in this case, your finger. You then click the mouse.
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