Visuospatial Working Memory

Sequence Memory Test

Watch a pattern of squares light up, then repeat the sequence in order. Each correct round adds one more step. How long can you keep up?

8–9

Global avg levels

15+

Expert performers

5.0

Corsi block avg (adults)

6.2M+

Tests completed

Level: 1

Best: 0

Press Start to begin.

What Sequence Memory Measures

Sequence memory tests your ability to encode and reproduce a growing series of spatial locations in order — a task that relies primarily on the visuospatial sketchpad, one of the two subsidiary systems in Baddeley's working memory model. Unlike verbal digit span, which recruits the phonological loop, sequence memory requires you to mentally map positions in space and replay them without the benefit of subvocal rehearsal.

The task closely parallels the Corsi Block Test, a widely used neuropsychological instrument developed by Philip Corsi in 1972. In the clinical version, an examiner taps blocks on a board in sequence while the patient must reproduce the pattern. It's used to diagnose spatial working memory deficits in conditions ranging from Alzheimer's disease to hippocampal lesions.

Corsi Block Test vs. Digit Span

Although both measure working memory capacity, they tap fundamentally different neural circuits. Most people perform slightly worse on spatial span than verbal span — a gap called the Corsi-digit asymmetry.

Property	Corsi Block / Sequence Memory	Digit Span / Number Memory
Memory system	Visuospatial sketchpad	Phonological loop
Brain regions	Right parietal, hippocampus	Left temporal, Broca's area
Adult average span	~5.0 units	~7.0 digits
Rehearsal strategy	Spatial path visualization	Subvocal repetition
Age of peak performance	Early 20s	Mid-20s
Training sensitivity	Moderate	High (chunking helps)

Score Distribution

Distribution of levels completed across 6.2 million test attempts. The curve peaks sharply at levels 7–9, mirroring the clinical Corsi block literature.

Score Percentile Reference

Levels Completed	Percentile	Classification
1–4	Bottom 10%	Well below average
5–7	10th–40th	Below average
8–10	40th–75th	Average
11–13	75th–95th	Above average
14+	Top 5%	Exceptional

How Sequence Memory Changes With Age

Visuospatial working memory capacity peaks in the early 20s and declines gradually — earlier and more steeply than verbal memory, which relies on overlearned language systems that remain robust longer.

Age Group	Average Level	90th Percentile	Trend
10–14	6.8	10	Developing
15–19	8.2	12	Rising fast
20–29	9.1	14	Peak
30–39	8.7	13	Slight decline
40–49	8.0	12	Moderate decline
50–59	7.3	11	Notable decline
60+	6.5	9	Steep decline

4 Evidence-Based Strategies to Improve

Path visualization

Instead of memorizing individual squares, mentally trace a continuous path connecting the lit positions — like drawing a shape. This recruits route-based spatial processing and reduces the number of independent chunks to remember.

Spatial labeling

Assign verbal labels to grid positions (top-left, center, bottom-right). Activating the phonological loop alongside the visuospatial sketchpad can boost capacity by bridging two memory systems simultaneously.

Dual n-back training

Dual n-back exercises require simultaneous tracking of visual position and auditory sequences — directly training both subsystems of working memory. Jaeggi et al. (2008) found measurable gains in fluid intelligence after 20 sessions of dual n-back training.

Aerobic exercise

Regular aerobic exercise promotes hippocampal neurogenesis, the brain region most critical for spatial sequence encoding. Studies show 20 minutes of moderate cardio improves spatial working memory performance by 10–15% on same-day tests.