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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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) |
Example Data
| subnum | trial | targ | foil | studytime | rt | order | resp | corr |
|---|---|---|---|---|---|---|---|---|
| example | 1 | 0110010011110100 | 0110010010111100 | 1002 | 531 | 0 | right | 1 |
| example | 2 | 1110101100110001 | 0110101100110011 | 1003 | 383 | 0 | left | 0 |
| example | 3 | 0011111000100111 | 0011101001100111 | 1001 | 466 | 0 | right | 1 |
| example | 4 | 1000110101101011 | 1010110001101011 | 1003 | 460 | 0 | left | 0 |
| example | 5 | 0100010011010011 | 1000010011010011 | 1003 | 541 | 0 | right | 1 |
| example | 6 | 0000010101110111 | 0000011101110110 | 1001 | 351 | 1 | right | 0 |
| example | 7 | 1101000111010011 | 1100000111010111 | 1003 | 281 | 1 | left | 1 |
| example | 8 | 1011000010001110 | 1011100010000110 | 1002 | 369 | 0 | right | 1 |
| example | 9 | 1011001101001110 | 1111000101001110 | 1002 | 364 | 1 | left | 1 |
Sample data showing typical output format. Actual values will vary by participant.
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