A visual working-memory capacity task in which participants detect whether a colour in a briefly shown array changed after a blank interval.
Configure parameters and run an interactive preview exactly as participants will experience it. No data is recorded.
Adjust parameters below, then start the preview on the right.
Include practice trials
Shown with feedback before the main task
Task parameters
Set sizes 2, 3, and 4 are tested. Outputs: K capacity per set size (Cowan formula: K = N × (hit rate − false alarm rate)).
This is a researcher preview. No participant data is recorded.
Simulated participant view
A visual working-memory capacity task in which participants detect whether a colour in a briefly shown array changed after a blank interval.
No data is recorded
A set of coloured squares is shown briefly, followed by a blank interval, then the array reappears — one colour may have changed. The participant taps Same or Changed.
Useful when the study needs an estimate of visual working-memory capacity (K) rather than verbal or executive measures. Particularly relevant in attention, ageing, and neuroscience research.
Less suitable for very high-frequency EMA because each block requires study, blank, and test phases, which add interaction time compared to single-tap tasks.
Use the default three set sizes (2, 3, 4) to obtain K estimates across the capacity range. Ensure the screen is large enough to render arrays clearly without items touching.
K = N × (hit rate − false alarm rate) per Cowan (2001). Values typically range from 2–4 items in healthy adults. Lower K scores reflect reduced visual working-memory capacity.