- It is the correlation (or agreement) between two administrations of the same or parallel form, separated by time.
- Short-term change is often practice, luck on a few items, fatigue, or a different device.
- Usually no.
- A test can be reliable but invalid (a consistent wrong construct).
- These lite games do not ship with test–retest coefficients or age norms.
- Play flanker-lite, word-recall-lite, or reaction-time more than once if you want to feel the bounce.
What is test–retest reliability?
It is the correlation (or agreement) between two administrations of the same or parallel form, separated by time. High reliability means ranks stay similar. It is not the same as validity (whether you measured the intended construct).
Why did my score change overnight?
Short-term change is often practice, luck on a few items, fatigue, or a different device. Standardized IQ batteries report reliability coefficients and standard errors. This site’s games do not.
Is a higher second score a higher IQ?
Usually no. Practice effects are well documented on many cognitive tasks. A second run of flanker-lite or word-recall-lite is still a web game, not a new deviation IQ.
How is this different from validity?
A test can be reliable but invalid (a consistent wrong construct). Clinical IQ uses both: reliable scores and evidence they index general cognitive ability in a normed battery.
Do online games have published reliability?
These lite games do not ship with test–retest coefficients or age norms. Treat them as practice toys.
How should I practice here?
Play flanker-lite, word-recall-lite, or reaction-time more than once if you want to feel the bounce. Do not treat the difference as an IQ change or a diagnosis.
❓ People also ask
What Is a Standard Score?
Raw scores (items correct, milliseconds) are not comparable across ages or tests. A standard score rescales them so that, in a reference sample, the mean and spread are fixed. This site does not convert game hits into that scale.
What Is a Standard Score? →IQ and Job Performance
Industrial-organizational research often finds that general mental ability predicts job performance better in more complex roles, with validity coefficients that are real but far from 1.0. This article is descriptive. It is not a recommendation to choose or reject a career from a web score.
IQ and Job Performance →Nutrition and Cognition
Brains run on ordinary metabolism. Skipping meals, dehydration, and extreme restriction can make attention feel worse in the short run. That is not the same as a supplement raising IQ, and this site does not sell or endorse pills.
Nutrition and Cognition →Heat and Test Scores
Hot, poorly ventilated rooms make many people slower and more irritable. Research on ambient temperature and exam or cognitive-task performance is mixed but often points to discomfort and attention costs — not a rewritten intelligence.
Heat and Test Scores →Smartphones and Attention
A phone buzz is a cue to switch. Task-switching and interruption costs are well known in cognitive psychology. That is not the same headline as “smartphones reduce IQ,” which oversells messy, correlational literatures.
Smartphones and Attention →