Dot Numerosity Judgment Task
System Requirements
Minimum: 800×600
Recommended: 1280×1024
Description
A perceptual numerosity judgment task using interleaved staircase procedures to estimate thresholds.
Measures: Numerosity discrimination, perceptual judgment
Perception Decision Making
About This Test
Participants view two groups of dots displayed briefly on screen and judge which group contains more dots. The task uses simultaneous interleaved staircase procedures to adaptively adjust difficulty, converging on the participant's discrimination threshold.
Test Details
dotjudgmentdotjudgment.pbl🚀 Try Without Registration
Run this test immediately without creating an account. Data stays in your browser.
Researcher Access Benefits
To save configurations, upload data, use translations, track completion, and manage studies, please log in or register for an account.
Scientific Background
PEBL-Specific References:
These studies used the PEBL version of this task.
- Mueller, S. T. (2011). The PEBL Dot Judgment Task. Computer software retrieved from http://pebl.sf.net/battery.html
Data Output
The task produces a trial-by-trial data file, a summary file with estimated thresholds, an aggregate file, and a session log.
dots-{subnum}.csv
Scoring and Interpretation
Example Data
| subnum | block | trial | practice | standard | thresh | side | corr | abstime | rt |
|---|---|---|---|---|---|---|---|---|---|
| subnum | block | trial | practice | standard | thresh | side | corr | abstime | rt |
| 111 | 1 | 1 | 1 | 50 | 4 | 1 | 1 | 3191 | 2739 |
| 111 | 1 | 2 | 1 | 6 | 4 | 1 | 1 | 6543 | 854 |
| 111 | 1 | 3 | 1 | 100 | 4 | -1 | 0 | 8004 | 737 |
| 111 | 1 | 4 | 1 | 6 | 3.75 | -1 | 1 | 9359 | 857 |
| 111 | 1 | 5 | 1 | 100 | 5 | 1 | 0 | 10825 | 877 |
| 111 | 1 | 6 | 1 | 6 | 3.5 | -1 | 1 | 12318 | 922 |
| 111 | 1 | 7 | 1 | 50 | 3.75 | 1 | 0 | 13849 | 1198 |
| 111 | 1 | 8 | 1 | 6 | 3.25 | -1 | 1 | 15655 | 1335 |
Sample data showing typical output format. Actual values will vary by participant.
About This Test
A perceptual numerosity judgment task using interleaved staircase procedures to estimate thresholds.
Category: Perception
Estimated Duration: 8 minutes
Available Translations: 7 languages
Documentation Status: Complete