Working memory
The mental workspace that holds a few pieces of information while you use them.
Working memory lets you keep a goal, rule, or next target in mind while you act — for example remembering that the next Schulte number is 12 while your eyes scan the grid.
Lab tasks such as dual n-back stress this system on purpose. Everyday focus also leans on it: holding instructions, tracking a conversation, or staying with a multi-step problem.
Short daily drills will not magically expand IQ, but they can make it easier to notice when your working-memory buffer is overloaded — and to return to the next actionable item.