Working Memory
Dual-Modality Span
Positions on a grid and spoken letters, presented together. Report matches N steps back.
TrainsThe span of what can be held and updated at once. Mental arithmetic, a sentence with a clause inside it, a name heard while doing something else — all draw on it.
Stop rule
Three seconds a trial, N + 20 trials a block. N rises above d′ 0.85; a block under 0.70 is a fail. Ends when a level is failed twice.
Duration5–8 min
Lifetime best—
Institution median—
The next mark—
FacultyMemory
Select N
Higher N demands a longer memory span. The level may adjust as you practise.
Train to the edge. Recover. Return.
The bands, and the figure that reaches each
Levels run 1 to 100. Level 100 is above Sovereign; nobody has reached it.
- The summit—100
- SovereignΔ 6,40096
- PreeminentΔ 3,50081
- EliteΔ 1,90065
- ExceptionalΔ 1,05050
- DistinguishedΔ 67538
- ProficientΔ 45028
- CompetentΔ 30017
- DevelopingΔ 150below 1
- NoviceThe floorbelow 1
Infinitely scalable difficulty. It never stops getting harder.