Reaction Time Experiments

This page outlines methods for conducting reaction time experiments, which are essential for understanding the speed of neural processes.

Ruler Drop Test Method

1. Hold a ruler just above the subject's hand.
2. Drop the ruler without warning.
3. Record the distance the ruler falls before being caught.
4. Convert the distance (cm) to reaction time (seconds) using a conversion table.

Example: A detailed reaction time experiment in biology GCSE might involve testing reaction times before and after consuming caffeine.

Variables in the ruler drop test:

• Independent Variable (IV): Level of caffeine in bloodstream
• Dependent Variable (DV): Reaction time (distance the ruler was caught)
• Control Variables (CV): Height above hand, level of distraction, amount of warning

Computer-Based Method

1. Use a website like https://humanbenchmark.com/tests/reactiontime
2. Record the first 10 reaction times
3. Practice for 5 minutes
4. Record the last 10 reaction times
5. Calculate the percentage change in reaction time

Variables in the computer-based method:

• IV: Amount of practice
• DV: Reaction time (seconds)
• CV: Website used, distractions, dominant hand use, time of day, screen brightness

Highlight: Conducting a reaction time practical helps students understand how nerve impulse function affects response speed.

Example: A reaction time ruler test hypothesis might predict that caffeine consumption will decrease reaction time.

These experiments provide valuable insights into how quickly the nervous system can process information and generate responses, demonstrating the efficiency of nerve impulse transmission steps.