Even/Odd Classification Task
Description
A brief number classification test in which participants judge whether a number is even or odd.
Measures: Number classification speed, basic numerical processing, simple decision making
Executive Function Processing Speed Number Processing
About This Test
A simple classification task where participants view numbers between a configurable range (default 100-999) and respond whether each number is even or odd. The task measures basic numerical processing speed and accuracy. It serves as a good warm-up task or baseline measure of processing speed.
Test Details
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Scientific Background
PEBL-Specific References:
These studies used the PEBL version of this task.
- Mueller, S. T. (2023). The PEBL Even-Odd Test. Computer software retrieved from http://pebl.sf.net/battery.html
Data Output
The task produces a trial-by-trial CSV file and a text summary report.
evenodd-{subnum}.csv
Example Data
example-data.csv Primary
Trial-by-trial data recording each classification response
| subnum | trial | starttime | number | isodd | resp | corr | rt |
|---|---|---|---|---|---|---|---|
| P-mnf4zf6r-tfms | 1 | 12171 | 707 | 1 | left | 1 | 513 |
| P-mnf4zf6r-tfms | 2 | 13209 | 700 | 0 | right | 1 | 878 |
| P-mnf4zf6r-tfms | 3 | 14613 | 990 | 0 | right | 1 | 902 |
| P-mnf4zf6r-tfms | 4 | 16039 | 719 | 1 | left | 1 | 556 |
| P-mnf4zf6r-tfms | 5 | 17131 | 380 | 0 | right | 1 | 815 |
| P-mnf4zf6r-tfms | 6 | 18474 | 243 | 1 | right | 0 | 599 |
| P-mnf4zf6r-tfms | 7 | 19601 | 543 | 1 | left | 1 | 575 |
| P-mnf4zf6r-tfms | 8 | 20704 | 490 | 0 | right | 1 | 637 |
| P-mnf4zf6r-tfms | 9 | 21867 | 764 | 0 | right | 1 | 1091 |
example-report.txt Summary
Text summary with overall accuracy and mean response time
PEBL Even-Odd Test Participant: P-mnf4zf6r-tfms Tue Mar 31 17:36:45 2026 Number of trials: 20 Mean RT: 644.05 Median RT: 592.5 Accuracy: 85%
Sample data showing typical output format. Actual values will vary by participant.
About This Test
A brief number classification test in which participants judge whether a number is even or odd.
Category: Executive Function
Estimated Duration: 8 minutes
Available Translations: 7 languages
Documentation Status: Complete