PEBL Hub — IRB Fact Sheet — 2026-08-23
Match To Sample
Memory
Perception
Category:Memory
Duration:~10 minutes
Parameters:7 configurable parameters available
Version:1.0
Description
A visual short-term memory task where participants memorize a grid pattern and identify it from two alternatives after a delay.
A matrix of red and yellow squares is briefly displayed, then removed. After a delay, two matrices appear side by side — one identical to the original and one slightly different. Participants choose which matrix matches the original. Measures visual short-term memory and pattern recognition.
Measures: Visual short-term memory, pattern recognition, processing speed
Key Parameters
| size | Number of rows/columns in the matrix (default: 4) |
| autorun | Should stimulus be presented automatically for a fixed time. 1 if yes, 0 if no, in which case it awaits participants keypress. (default: 1) |
| prestime | How long the stimulus should be presented, if autorun is non-zero (in ms). (default: 1000) |
| givefeedback | Should correct/incorrect feedback be given. 1=yes,0=no (default: 1) |
| numtrials | Number of total trials (default: 30) |
| delay | Time between study and test, in ms (default: 3500) |
References
Perez, W. A., Masline, P. J., Ramsey, E. G., & Urban, K. E. (1987). Unified tri-services cognitive performance assessment battery: Review and methodology. DTIC/TR-87-007.
Mueller, S. T. (2011). The PEBL Match To Sample Task. Computer software retrieved from http://pebl.sf.net/battery.html