Facts about Working Memory
- 09
Switching between different working memory tasks causes a 50 to 100 millisecond cost per switch, a phenomenon called task-switching cost that accumulates measurably when rapidly alternating between cognitive demands.
- 08
Older adults aged 65 and above show working memory decline of approximately 30 to 40 percent compared to younger adults, primarily due to reduced prefrontal cortex efficiency and slower information processing speed.
- 07
Approximately 10 to 15 seconds represents the maximum duration that working memory can retain information without active maintenance, after which decay begins unless rehearsal occurs.
- 06
Visuospatial sketchpad, the component storing visual and spatial information in working memory, retains approximately 3 to 4 objects with precise location details for roughly 10 to 15 seconds without rehearsal.
- 05
Children aged 4 to 5 years typically maintain working memory for only 2 to 3 items, while this capacity expands to 4 to 5 items by age 7 as prefrontal cortex development progresses.
- 04
Auditory interference disrupts phonological working memory more severely than visual interference, causing recall errors to increase by up to 50 percent when irrelevant speech plays during memory tasks.
- 03
Dual-task interference occurs when dividing attention between two working memory demands reduces accuracy by 20 to 40 percent, demonstrating that cognitive resources are finite and shared across competing tasks.
- 02
Articulatory rehearsal, the mental repetition of information using phonological loop mechanisms, can maintain working memory contents for approximately 15 to 30 seconds without continued attention.
- 01
The prefrontal cortex maintains working memory capacity of approximately 4 to 5 discrete items simultaneously, a limitation identified through decades of cognitive psychology research.