Pattern Comparison (Sequential)
Description
A sequential pattern comparison task where participants memorize a dot pattern and then judge whether a second pattern is the same or different.
Measures: Visual short-term memory, pattern comparison, processing speed
Memory Processing Speed Perception
About This Test
A dot grid pattern is displayed briefly, then erased. After a delay, a second pattern appears and participants judge whether it is the same as or different from the first. Measures visual short-term memory and pattern discrimination.
Test Details
pattcomp-seqpattcomp-seq.pbl🚀 Try Without Registration
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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 Pattern Comparison Task. Computer software retrieved from http://pebl.sf.net/battery.html
Data Output
Trial-by-trial data with same/different condition, response, and accuracy.
patcompseq-{subnum}.csv
Data Columns
| Column Name | Description |
|---|---|
| subnum | Participant ID |
| trial | Trial number |
| samediff | Whether the second pattern was the same as or different from the first (same/diff) |
| delta | Number of dot position differences between patterns (0 for same trials; 1, 2, or 3 for different trials) |
| mat1 | First (study) pattern encoded as a binary string (1=dot present, 0=empty) |
| mat2 | Second (test) pattern encoded as a binary string |
| abstime | Absolute timestamp in milliseconds from the start of the test |
| rt | Response time in milliseconds from when the second pattern appeared |
| resp | Participant response (same or different) |
| corr | Whether the response was correct (1) or incorrect (0) |
Example Data
| subnum | trial | samediff | mat1 | mat2 | abstime | rt | resp | corr |
|---|---|---|---|---|---|---|---|---|
| example | 1 | diff | 0110111110000100 | 0101111001010100 | 3415 | 669 | different | 1 |
| example | 2 | same | 1010101000010111 | 1010101000010111 | 9506 | 1316 | same | 1 |
| example | 3 | diff | 0011011011000011 | 1011110011100000 | 16234 | 989 | different | 1 |
| example | 4 | same | 0101101101010001 | 0101101101010001 | 22639 | 668 | same | 1 |
| example | 5 | diff | 0100110111011000 | 0111000011011001 | 28720 | 677 | different | 1 |
| example | 6 | diff | 1010101100101010 | 0110111000101001 | 34813 | 831 | different | 1 |
| example | 7 | diff | 0111100000010111 | 1011000100011110 | 41061 | 1012 | different | 1 |
| example | 8 | same | 0100111110010001 | 0100111110010001 | 47483 | 607 | same | 1 |
| example | 9 | diff | 0010110011011001 | 0110111001010100 | 53504 | 914 | different | 1 |
Sample data showing typical output format. Actual values will vary by participant.
About This Test
A sequential pattern comparison task where participants memorize a dot pattern and then judge whether a second pattern is the same or different.
Category: Processing Speed
Estimated Duration: 8 minutes
Available Translations: 7 languages
Documentation Status: Complete