The cognitive function that temporarily holds and manipulates information. Central to Sudoku solving.

Working Memory refers to the cognitive function that temporarily holds information while simultaneously manipulating and processing it. In psychologist Baddeley's multi-store model, it consists of four components: visuospatial sketchpad, phonological loop, central executive, and episodic buffer. Solving Sudoku mobilizes all working memory components by simultaneously holding multiple candidates, performing logical operations, and processing spatial information.

Working Memory Capacity

Adult working memory capacity is generally considered 4-7 items (with individual variation). Trying to process information beyond capacity creates excessive cognitive load and frequent errors. The difficulty of 'solving Sudoku without notes' is precisely because each cell's candidate digits cannot be held in working memory. <a href="/en/glossary/pencil-mark/">Pencil marks</a> are 'externalization' of working memory, freeing limited capacity to focus on logical operations of solving.

Working Memory Training Through Sudoku

Working memory is generally considered improvable through training. Sudoku uses the central executive intensively by examining multiple techniques in parallel and performing logical operations while holding multiple candidates. Regular Sudoku practice is positioned as an activity that may enhance working memory efficiency. The key is challenging difficulty 'right at your capacity limit' - tasks completable within capacity provide little training effect.

Relationship with Aging

Working memory is one of the cognitive functions that typically declines with age. It peaks in the 30s and gradually decays, with reports indicating roughly half of youth levels in the 70s. Meanwhile, seniors who engage in regular cognitive activities are known to experience slower decline. <a href="/en/articles/sudoku-elderly-routine/">Senior Sudoku continuation</a> is effective as a strategy for maintaining cognitive functions including working memory. However, excessive difficulty backfires - appropriate difficulty selection is the prerequisite.