Trail-making tests assess visual attention.
In the "A version" of the test, the subject connects 25 consecutive targets, each numbered (1, 2, 3, etc).
In the "B version" of the test, shown here, the subject alternates between numbers and letters (1, A, 2, B, 3, C, etc).
The test is scored in speed and accuracy.
Reproduced with permission from: Schiffer RB, Lajara-Nanson WA. Neuropsychiatric examination. In: Neuropsychiatry, 2nd ed, Schiffer RB, Rao SM, Fogel BS (Eds), Lippincott Williams & Wilkins, Philadelphia 2003. Copyright © 2003 Lippincott Williams & Wilkins.
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