The vigilance test (WAFV)

You watch a screen for a long time. Now and then a square turns black, or something changes for a moment, and you respond. Then you wait again. That is the vigilance test. Centres often call it WAFV.

Rare events, a long wait, and nothing to keep you entertained. The click is easy. Staying on it is the work.

There is no trick

You can't out-think a blank square. You can only stay on it. Capable people get frustrated because spotting patterns and knowing things don't help. It is closer to being a good lookout than being a good student.

There are two ways to fail. You miss the change, or you respond when nothing happened. Both count against you. A driver who never rings the bell is dangerous. A driver who rings it at shadows is also dangerous. The scoring cares about both.

Why the second half is the real test

Most people can do five minutes. Assessment versions are often much longer. Attention decays. Your mind writes a shopping list. You come back just as the target happens, or just after.

If you only practise short runs, you're practising the easy part. The hard part is minute twenty-two, when nothing has happened and you're still supposed to be a professional.

How to practise it

• Sit as you will sit on the day. Phone in another room. Same hand on the response.
• Do a full-length run at least a few times. Short runs teach the click. Long runs teach the job.
• Watch false alarms. Bored people click for entertainment. That costs marks.
• Don't try to make it interesting. If practice feels exciting, you aren't really practising vigilance.

On the day, the live instructions win: what counts as a target, how long you have, whether you can pause. A practice run is so you already know how a long wait feels, not so you can argue with the invigilator.

If you can stay accurate when it is boring, you will do better than people who only practised the tests that feel like a game.