Trails A & B

A 5 X 5 array of buttons is displayed on the screen. There are two versions:

        A: The buttons are labelled with the numbers 1 25.

        B: The buttons are labelled with alternating digits and letters 1 A 2 B 3 C    as illustrated on the right.

The testee taps on the buttons in sequence as quickly as possible. The time taken to complete the task and the number of errors are recorded.

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