'Reaction Time: The Ruler Drop Test Experiment (muscle memory / science project)  Science Kits and more https://elementarysciencen.wixsite.com/sciencekits  Ruler https://amzn.to/2Yh65xE  My Filming equipment: Cell Phone Tripod 54 inch Travel Tripod with Bluetooth Remote - https://amzn.to/34REzbB  Blue Yeti USB Microphone - https://amzn.to/3ePJwGu  Green screen & lights - https://amzn.to/2XT9Yc1  Apple iMac 21.5in 2.7GHz Core i5 8GB memory - https://amzn.to/34ZMIe7 iPhone 8 - https://amzn.to/3byn4zw iMovie for editing (on Mac)  Reaction Time: The Ruler Drop Test Experiment  How fast can you react? In this activity, volunteers participate in a simple ruler drop experiment and learn about the body’s response behind it. We are testing young verses old.  The neural pathway involved in a reaction time experiment involves a series of neural processes. This experiment does not test a simple reflex. Rather, this activity is designed to measure the response time to something that you see.   Catching a dropped ruler begins with the eye watching the ruler in anticipation of it falling. After the ruler is dropped, the eye sends a message to the visual cortex, which perceives that the ruler has fallen. The visual cortex sends a message to the motor cortex to initiate catching the ruler. The motor cortex sends a message to the spinal cord, which then sends a message to the muscle in the hand/fingers. The final process is the contraction of the muscles as the hand grasps the ruler.   A person’s reaction time depends on a couple of things that can be improved and a couple that cannot. Practice does make perfect because you can create a “muscle memory” that means you do not have to think so much to catch the ruler. But electrical signals to travel along your nerves are involuntary and you cannot control how quickly they occur.  • How fast is your reaction time? • Does your reaction time improve with practice? • Why was the ruler caught in the middle (after a lag period) rather than at the end (instantaneously)? • What causes this hesitation? • How can reaction time be improved?  What had to happen in your body for you to catch the ruler?  • Explain that in order to catch the ruler a lot of messages have to be passed along different nerves: • The eye sees the ruler drop. • The eye sends a message to the visual cortex in the brain. • The visual cortex sends a message to the motor cortex in the brain. • The motor cortex sends a message to the spinal cord. • The spinal cord sends a message to the hand/finger muscle. • The finger muscle contracts to catch the ruler.  This happens almost instantaneously. How fast it actually happens is called the reaction time.    Try these other test: When comparing hands, volunteers will usually find that their dominant hand is faster. Because the dominant hand is used more often every day, the neurons that carry messages between that hand and the brain are faster at transmitting electro-chemical signals. They are communicating along well-worn pathways. By running the same messages along the same pathway repeatedly, students can improve their motor skills.  The phrase “practice makes perfect” is scientifically accurate.  Distance                   Time 2 in (5 cm)               .10 sec (100 ms) 4 in (10 cm)             .14 sec (140 ms) 6 in (15 cm)             .17 sec (170 ms) 8 in (20 cm)             .20 sec (200 ms) 10 in (25.5 cm)       .23 sec (230 ms) 12 in (30.5 cm)       .25 sec (250 ms)  Reaction Time: The Ruler Drop Test  Reaction Time: The Ruler Drop Test science project science for kids  #ReactionTime:TheRulerDropTestExperiment #TheRulerDropTestExperiment #Therulerdroptestforreaction' 

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