Brain Reaction-Time Test
Run a simple reaction-time investigation and compare repeated measurements.
30 cm ruler, partner, notebook
What to do
Ask a partner to hold the ruler vertically.
Place your fingers near the zero mark without touching it.
Catch the ruler when it is released unexpectedly.
Record the distance and repeat five times.
Compare results and discuss practice effects and experimental limitations.
What this develops
Reaction time, nervous-system responses, repeated measures and experimental limitations.
Use age-appropriate supervision and safe materials. Stop any activity that is unsuitable for the learner or environment. These resources are educational activities, not professional laboratory, medical or safety instructions.
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