Lesson 3: Reaction Time RP Flashcards

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1
Q

What is the method of testing for someone’s reaction time?

A

1.) Person 1 sits on a chair with good, upright posture.
2.) Person 1 places forearm of their dominant arm across the table - with their hand hanging over the edge.
3.) Person 2 holds a ruler vertically. The 0cm mark betwen Person 1’s thumb and first finger.
4.) Person 2 will drop the ruler randomly, person 1 will catch the ruler as quick as possible.
5.) Record the number on the ruler that is level with the top of Person 1’s thumb.
6.) Have a short rest, repeat the test serveral times and calculate a mean.
7.) Repeat the test with Person 2 catching the ruler and person 1 dropping it.
Use a conversion table to convert measurements into reaction times.

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2
Q

What do we use to convert the ruler measurements from the experiment into a reaction time?

A
  • We use a conversion table.
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3
Q

What are 2 control variables for this practical?

A
  • Starting distance between a specific person’s thumb and first finger should be kept constant.
  • Keep conditions in the room the same (ie. lighting/ background noise)
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4
Q

What are some independent variables that we could have in this practical?

A
  • The person who’s catching the ruler.
  • Effect of practise
  • Dominant vs non- dominant hand (of the same person.)
  • Effect of chemicals ie. caffeine.
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5
Q

What is the dependent variable in this practical?

A
  • Dependent variable = reaction time.
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6
Q

How would you investigate the effect of practise on reaction time?

A
  • 1 person catches the ruler a large number of times.
  • See if reaction time of the person changes the more tries they have.
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7
Q

How wold we investigate the effect of caffeine on reaction time?

A
  • Person will carry out experiment normally and record their reaction time.
  • Drink 25cm3 of cola (with caffeine) half an hour before the 2nd experiment.
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8
Q

Why do we need to carry out the investigation with caffeine- free cola as well as caffeinated cola when experimenting the ffect caffeine has on reaction time?

A
  • Acts as a control.
  • There may be other chemicals in the cola that are effecting the person’s reaction time.
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