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Reaction time practicals and data skills

Homeostasis and response • The human nervous system

Key concepts

What you'll likely be quizzed about

  • A participant places their thumb and forefinger at the 0 cm mark while a tester holds a ruler at the 30 cm mark.
  • After release without warning, the distance caught measures reaction time, as greater distance indicates a longer fall and a longer reaction interval.
  • Randomising drop timing prevents anticipation, while multiple repeats improve reliability.
  • Conversion charts or the equation for free fall translate distance into seconds for comparison across conditions.
  • Potential limitations include tester cues, practice effects, participant fatigue, and environmental distractions.

Flashcards

Test your knowledge with interactive flashcards

List the main steps of the ruler-drop practical.

Click to reveal answer

Hold the ruler at the 30 cm mark, participant places fingers at 0 cm, drop without warning, record catch distance, repeat three times and calculate a mean, swap roles for reproducibility.

Key notes

Important points to keep in mind

The ruler-drop method converts caught distance to time using a conversion chart or the free-fall equation; always record units and significant figures.

Randomise drop timing to prevent anticipation and reduce systematic bias.

Collect at least three repeats per condition and calculate a mean to improve reliability.

Control environmental and participant variables such as lighting, posture, and hand used.

Plot numerical data using the appropriate graph type: line or scatter for continuous variables, bar chart for categorical data.

Spot anomalies early and check raw data and method notes before deciding whether to exclude them from trend analysis.

Distinguish correlation from causation; additional controlled tests are necessary to prove cause-effect relationships.

Report both central values (mean) and variation (range or error bars) to show precision and spread.

State limitations and possible confounding variables when drawing conclusions from reaction-time experiments.

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