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Fear Factor: Using Pulse Rate to Measure Emotion

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Oh, were you ever scared! Your heart pounded, your breath rate shot up, your palms got cold and clammy. Fear does that to us. Here's a science project based on roller coaster rides to see if heart rate is an accurate measurement of fear. Are you brave enough to take on this frightfully fun project?


Areas of Science
Time Required
Very Short (≤ 1 day)
Material Availability
Readily Available
Very Low (under $20)
No issues
Darlene E. Jenkins, Ph.D.

This project is based on a DragonflyTV episode.


The goal of this project is to determine if pulse rate is a good indicator of fear or excitement.


Fear is much more than simply a reaction in your head. It's an automatic adrenaline rush to prepare us for fight or flight. Your whole body responds to fear, especially your heart. We've all experienced that familiar pounding sensation in our chests after someone or something has startled us.

But what happens when we are just mildly frightened, or even just a little excited about something? Does our heart rate change accordingly? In this project, you'll find out. First, you'll need to set up a situation that temporarily makes volunteers a little anxious or scared. Then, you'll ask them to compare their heart rates before and after the stimulating event by taking their pulse.

Scientists have known for a long time that emotions like fear, anger, frustration, and anxiety cause the body to produce an automatic "flight or flight" response. This involves nerve and chemical signals that fire instant messages from the amygdala, a peanut-sized structure deep within the brain, to the heart, lungs, and other organs of the body whenever we sense fear or strong emotions. Additional nerve groups, called the sympathetic system, originate within the brain stem's medulla region and use adrenaline-like chemicals to stimulate the heart and accelerate its rhythm. Neighboring nerve fibers of the parasymphathetic system provide inhibitory signals to the heart and other organs to calm things down again, so we don't stay in a constant state of heightened alert. The balance between these two systems provides the right mix of up and down responses that keeps us safe and aware when danger is near or stress is present, and relaxed and calm after the stressful situation subsides.

You'll learn more about the relationship between emotions, brain, and body once you start this project. In the next section, we've included some suggestions for topics to research before you start your experiment so that you'll have more background and a better understanding of the science related to heart rate and the physiology of fear. You'll also see suggestions for other types of experiments to do in the Variations section below in case you don't have easy access to a great amusement park to run your tests.

Good luck, have fun, and let the screams begin!

Terms and Concepts

To do this project, you should do research that enables you to understand the following terms and concepts:



Materials and Equipment

To do this experiment you will need the following materials and equipment:

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Experimental Procedure

  1. Recruit at least 10 friends or family members to be volunteers for your study.
    1. Tell them the day for your experiment and explain that you will be asking them to ride some fun but potentially scary rides at your local amusement or theme park.
    2. For tips on how to do experiments with volunteers, see the following Science Buddies resources:
  2. Practice taking your pulse. For details on how to take your pulse, you can go to Heart Rate and Pulse.
  3. Before the day of your experiment, you might visit the amusement park and scout out the rides to choose those you will want to include in your experiment. Try to select three rides that vary in speed and scariness, and even consider including one ride that is very calm and slow so you have a broad range of rides in your experiment. Check your own pulse rate before and after the rides that you choose to see how you respond to them.
  4. The day of your experiment, gather your friends at the amusement park and remind them of your plan. Teach them how to take their pulse and have them record their resting pulse rate a couple of times for practice.
  5. Now, the fun begins! Have your volunteers ride the three rides you selected. You can call them rides A, B, and C. Each time ask your volunteers to take and record their pulse before getting on the ride and then again as soon as they can after they get off.
  6. Be sure to have them stand still or sit a few minutes before getting on the next ride so that their heart rates have time to return to normal.
  7. Ask your volunteers to also rate each ride A, B, and C from 1 to 5 for "thrill factor," where 1 is the least scary and 5 is the most scary.
  8. After the three rides, collect the volunteers' data.

Analyze Your Data

  1. Determine the change in pulse rate for each volunteer for each ride by subtracting their pulse rate before the ride from their pulse rate after the ride.
  2. Calculate the average change in pulse rate for all volunteers for all three rides.
  3. Add up the volunteers' "thrill factor" ratings for each ride and calculate the averages for all three rides.
  4. Make a bar graph with three bars showing the average change in pulse rate for rides A, B, and C. On a separate bar graph use three bars to show the average "thrill factor" rating for rides A, B, and C.
  5. Do you see any differences in the average change of pulse rate between the three rides?
  6. Do you see any differences in the average "thrill factor" between the three rides?
  7. Is there any correlation between pulse rate and scariness of the rides?
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Ask an Expert

Do you have specific questions about your science project? Our team of volunteer scientists can help. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.

Global Connections

The United Nations Sustainable Development Goals (UNSDGs) are a blueprint to achieve a better and more sustainable future for all.
This project explores topics key to Good Health and Well-Being: Ensure healthy lives and promote well-being for all at all ages.


  • If you don't have an amusement park close by, you can still do an experiment to evaluate the connection between emotions and heart rate. Try using short videos or sections of movies as your stimulus for fear or excitement. You could choose a scene from a scary movie or an exciting sports event, for example. As in the original experiment, ask your volunteers to practice taking their pulse rates before watching any video and then before and after each video screening.
  • Would blood pressure be a good measurement of fear? Purchase inexpensive blood pressure monitors and use them to record the volunteers blood pressure before and after each ride. Compare your blood pressure data to the pulse rate data of the original experiment.
  • Try a more long-term experiment for yourself or with a few friends. Purchase inexpensive wrist heart monitors to wear and record pulse rates during several hours per day. Keep a log of your activities and feelings every hour during the same time period. Perhaps repeat the monitoring of heart rate and logging of activities and emotions for a few days in a row. At the end of each day, note any changes in heart rate and also any highs or lows in activity level or emotion. Do you see any correlations between activity level or emotional state and pulse rate?
  • For more Science Buddies projects related to heart rate and exercise, see


If you like this project, you might enjoy exploring these related careers:

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Each time your heart beats, or you breathe, think, dream, smell, see, move, laugh, read, remember, write, or feel something, you are using your nervous system. The nervous system includes your brain, spinal cord, and a huge network of nerves that make electrical connections all over your body. Neurologists are the medical doctors who diagnose and treat problems with the nervous system. They work to restore health to an essential system in the body. Read more
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Why people take certain actions can often feel like a mystery. Psychologists help solve these mysteries by investigating the physical, cognitive, emotional, or social aspects of human behavior and the human mind. Some psychologists also apply these findings in order to design better products or to help people change their behaviors. Read more

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MLA Style

Science Buddies Staff. "Fear Factor: Using Pulse Rate to Measure Emotion." Science Buddies, 17 May 2023, https://www.sciencebuddies.org/science-fair-projects/project-ideas/HumBeh_p024/human-behavior/fear-factor-using-pulse-rate-to-measure-emotion. Accessed 6 Dec. 2023.

APA Style

Science Buddies Staff. (2023, May 17). Fear Factor: Using Pulse Rate to Measure Emotion. Retrieved from https://www.sciencebuddies.org/science-fair-projects/project-ideas/HumBeh_p024/human-behavior/fear-factor-using-pulse-rate-to-measure-emotion

Last edit date: 2023-05-17
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