Change Detection

How to play Change Detection

1. Remember a line of symbols and identify the position that changes.
2. Read the prompt carefully and choose an answer, or type into the answer field.
3. After checking, read the explanation. Use “Next round” to continue.
4. Complete ten rounds for a score out of 100. Restart creates a fresh session.

A worked example

Which position changed? ⬟ ⬟ ◆ ● ⬟

After studying and hiding the prompt, the answer is 1. Compare positions, from left to right.

A useful way to practice

Read the current rule before reacting. Device latency, input method, distractions and familiarity can all change a result. For fairer comparisons, use the same device and avoid treating a score as a diagnosis.

What your result means

This is a recreational attention activity. Results describe performance on this particular task, with this device and these rules. They are not a clinical assessment, IQ score or promise of improvements in daily life. Your best result and recent sessions stay in this browser; no account is required.