Investing Reaction Time

• What is the method for measuring reaction time in this practical?

  • Person 1 sits upright on a stool
  • Places dominant arm across the table
  • Person 2 holds a ruler vertically
  • Drops the ruler randomly
  • Person 1 catches the ruler
  • Measurement is recorded
  • Repeat several times and calculate mean
• What position should person 1 be in during the test?

  Upright on a stool
• How should the ruler be positioned before it is dropped?

  The zero mark should be between fingers
• What should person 1 do when the ruler is dropped?

  Catch the ruler quickly
• What is recorded after person 1 catches the ruler?

  The measurement at the top of the thumb
• What should be done after the first test?

  Person 1 has a short rest
• Why do the two people switch places in the experiment?

  To compare their reaction times
• What is the independent variable in this experiment?

  The person being tested
• What is the dependent variable in this experiment?

  The reaction time
• What are the control variables in this experiment?

  • Distance between thumb and finger
  • Measurement at the top of the thumb
  • Consistent room conditions (lighting, noise)
• What could happen if control variables change?

  It could affect the reaction time
• What are some other independent variables that could be investigated?

  • Effect of practice on reaction time
  • Hand used to catch the ruler
  • Impact of chemicals like caffeine
• How could practice affect reaction time?

  It may shorten reaction time
• How can the effect of hand dominance be tested?

  Test with dominant and non-dominant hands
• How can caffeine's effect on reaction time be tested?

  Compare reaction times after cola consumption
• What is a potential issue when testing caffeine's effect?

  Other chemicals in cola may affect results
• What should be checked before giving subjects caffeine?

  Medical issues that may be affected
• Where should the test be conducted?

  In a lab without hazardous chemicals