Instructions

In this experiment you will be shown two horizontal lines on every trial. Your task is to make the length of line B equal to that of line A.

1. On each trial, you will be shown two lines of varying length, line A and line B.
2. Use the '-' and '+' signs below the image to increase or decrease the length of line B until you feel it equal to the length of line A. Take your time and be as accurate as possible.
3. When you feel the lines are equal, press the space bar. You will then begin the next trial.

You will complete 12 experimental trials. At the end, your results on accuracy will be shown. Click on the button to begin.