Examine how movement preparation is influenced by the number of response choices.

Condition 1: Simple Reaction Time (One Ruler)

The experimenter will hold one ruler vertically in the hand of his or her choosing at its highest point so that the 30 cm line is closer to the holding point (see Figure). The participant will place the thumb and forefinger of one hand on either side of the ruler at its bottom (0 cm) without actually touching the ruler. The experimenter, without giving any indication to the participant, will then release the ruler and the participant must catch it as quickly as possible. Record the numerical value of the point of the catch. Each participant will complete 10 trials.

Condition2: Choice Reaction Time (Two Rulers)

The experimenter will hold two rulers (one for each hand) vertically at their highest point so that the 30 cm line is closer to the holding point (see Figure). The participant will again place one thumb and forefinger on either side of each ruler at its bottom (0 cm). The experimenter, without giving any indication to the participant, will then release one of the two rulers and the participant must catch it as quickly as possible. Participants should avoid performing the catching movement with both hands. If this occurs, redo the trial. Record the numerical value of the point of the catch. Each participant will complete 10 trials.

Calculate the mean time for by first compute the total time by adding up the times from trials 1 through 10. Second, divide the total time by the number of trials.

Calculate the means for each task (simple RT and choice RT).

Complete the data sheet by recording the means.

Create a bar graph to compare the means for each task.

Address the following:

1. Data Sheet

2. Copy & paste (or insert) a bar graph representing a comparison of the means for each task here:

3. Based on your data, how was movement preparation influenced by the number of response choices?

4. What theory does this confirm or deny? Explain your answer.

5. Does Condition 1 accurately measure reaction time? Why or why not.

6. Why is it important for the partner to not let you know when he/she is going to drop the ruler? Explain.

7. How can the learning gained from this lab and Hick?s Law apply to your future career (be sure to provide specific example(s))?

Partner dropping he ruler 30cm line on the ruler You trying to catch the ruler Trial 1 2 4 5 6 7 8 9 10 MEAN Simple RT Choice RT