Attention

There is no verifiable published norm. The age charts circulating online do not name a study, a sample or the testing conditions behind them. The Schulte table is a practice and self-check tool rather than a normed scale, so the meaningful comparison is against your own previous times, not against a chart of unknown origin.

A 5x5 grid holds the numbers 1 to 25 in random positions, and you tap them in order from 1 to 25 while the clock runs. Keeping your gaze near the centre and using peripheral vision to scan is usually faster than hunting cell by cell, which is really twenty-five separate searches.

You will get visibly faster at the grid, but most of that gain is task familiarity. Evidence that it transfers to lectures, meetings or homework is weak; the Simons et al. review (2016) is the standard reference. It is a practice exercise with clear feedback, not an attention-training programme.

Any child who recognises the numbers 1 to 25 can use it, usually around school age. Be especially careful not to read a child's time against a chart: childhood times change quickly with age anyway, and the charts in circulation have no stated source. Their own progress over a few weeks is the useful signal.

A colour word appears printed in a different colour -- the word RED written in blue ink -- and you have to name the ink colour rather than read the word. Reading is the more automatic response, so you have to hold it back, and the extra time that costs is the interference score. It measures inhibitory control.

The Stroop effect is the slowdown and increased error rate that occur when a word's meaning conflicts with the colour it is printed in. Stroop first reported it in 1935, and it has since become one of the most reliably reproducible findings in psychology. The colour-word test is its standard form.

Changing the grid size makes the scores incomparable. A 7x7 grid has 49 targets and usually takes two to three times as long, and it leans harder on how wide your peripheral scan is. If you want to track your own progress, stay on one size.

No. Tests like these cannot identify an attention disorder and produce no diagnostic result. If attention difficulties are affecting work, study or daily life, that calls for a formal assessment by a qualified professional. A test can help you notice changes in your own state; it cannot replace an assessment.