Reflex nerves and reactions
Some of our body reactions are deliberate and conscious. Others are automatic ‘reflex’ actions. Catching a dropped object includes an element of reflex reaction.
Experiments
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Measuring reaction time of a human nerve-controlled reaction
Measure the speed of a reaction involving nerves: ‘catching a ruler’. See how much it varies within the group and how it is influenced (if at all) by consumption of caffeine.