Part A: connect numbered dots 1 → 2 → 3 in order. Part B: alternate between numbers and letters (1, A, 2, B, 3, C…). The ratio of B-time to A-time is the classic cognitive-flexibility index.
What makes this one different
We log each segment (the path between two consecutive dots) so you can see exactly where you stumbled — and identify whether the cost was visual scanning, motor planning, or task-switching.
Click/tap the next dot in sequence. Connect in order: A=1→2→3→…, B=1→A→2→B→…
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The Trail Making Test is one of the most widely used neuropsychological measures in the world. Part A measures visual scanning and motor speed. Part B adds a set-shifting demand: you must switch between number and letter sequences. The extra cost (B minus A, or the ratio B/A) reflects how hard it is for you to switch mental sets — a marker of executive function.
Part A time under 30 seconds is normal for adults. Part B under 75 seconds is normal.
B/A ratio of 1.5–2.5 is healthy. Above 3.0 suggests significant set-shifting difficulty.
For a meaningful B/A ratio, yes. But you can practice each one separately first.
Clicking the wrong dot before the correct one. Each wrong click counts as one error; you then click the correct one to continue.