- Alertness is necessary but not sufficient.
- Dropping old items for new ones, as in running span or n-back.
- Notifications steal the goal.
- No.
- Dual n-back lite loads two streams.
- Flanker lite (select) and visual 2-back lite (update).
Is attention just being awake?
Alertness is necessary but not sufficient. Control is the mapping from goal to response among distractors.
What is updating?
Dropping old items for new ones, as in running span or n-back. Span length and updating are related, not identical.
Why do phones wreck both?
Notifications steal the goal. That is a context effect, not a lifetime trait tattoo from one session.
Can I diagnose ADHD here?
No. Diagnosis needs a qualified clinician, history, and often more than a game. Do not self-label from a 2-back.
Dual tasks?
Dual n-back lite loads two streams. Dual-task cost is interesting and still not an IQ index.
What to try?
Flanker lite (select) and visual 2-back lite (update). Read the disclaimer on each page.
❓ People also ask
What is construct validity?
Construct validity is the argument that a score reflects a named idea — working memory, not “being clever in general.” It is built from theory, patterns of correlations, and failed rival explanations. A 20-trial number-Stroop lite can feel like control. Feeling is not a validity coefficient. This site never reports a licensed IQ.
What is construct validity? →What is criterion validity?
Criterion validity asks whether a score lines up with something you care about that is not the test itself — a later grade, a supervisor rating, or a Wechsler index. Concurrent means measured at the same time; predictive means later. A visual 2-back lite has no published criterion table. It is not an employment screen and not an IQ.
What is criterion validity? →What is content validity?
Content validity is whether the item set covers the skill or knowledge you claimed. A spelling test with only the letter Q is a coverage failure. Shape-span lite samples a tiny visuospatial sequence. It does not cover “all spatial intelligence.” Experts, blueprints and reviews build content arguments. A weekend hackathon does not.
What is content validity? →What is a confidence interval?
A 95% confidence interval is a procedure: if you repeated the study under the same model, 95% of such intervals would cover the parameter. It is not the probability that this one interval magically contains the truth after you saw it. Licensed IQ manuals turn a standard error into a range around a scaled score. Digit-span lite does not. Treat any integer from this site as a toy count.
What is a confidence interval? →What is item response theory?
Item response theory (IRT) models each item: harder items need more of the trait for a 50% chance of success; discriminating items separate nearby people. Computerized adaptive tests pick the next item from that model. Pattern-matrices lite is a fixed original set. It does not estimate a theta with published item parameters. It is not an IQ.
What is item response theory? →