Match To Sample
Description
A visual short-term memory task where participants memorize a grid pattern and identify it from two alternatives after a delay.
Measures: Visual short-term memory, pattern recognition, processing speed
Memory Perception
About This Test
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.
Test Details
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Researcher Access Benefits
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Scientific Background
Original Task References:
These references describe the original task that this PEBL implementation is based on.
- 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.
PEBL-Specific References:
These studies used the PEBL version of this task.
- Mueller, S. T. (2011). The PEBL Match To Sample Task. Computer software retrieved from http://pebl.sf.net/battery.html
Data Output
Trial-by-trial data with target and foil patterns, presentation order, response, and accuracy.
matchtosample-{subnum}.csv
Data Columns
| Column Name | Description |
|---|---|
| subnum | Participant ID |
| trial | Trial number |
| targ | Target matrix encoded as comma-separated binary values (1=red, 0=yellow) |
| foil | Foil matrix encoded as comma-separated binary values |
| studytime | Time in milliseconds the sample matrix was displayed |
| rt | Response time in milliseconds from when comparison matrices appeared |
| order | Presentation order (0=target on right, 1=target on left) |
| resp | Participant response (left or right) |
| corr | Whether response was correct (1) or incorrect (0) |
About This Test
A visual short-term memory task where participants memorize a grid pattern and identify it from two alternatives after a delay.
Category: Memory
Estimated Duration: 10 minutes
Available Translations: 9 languages
Documentation Status: Complete