Urns Task
System Requirements
Minimum: 1024×768
Recommended: 1024×768
May be challenging for colorblind participants
Description
An 'urns' or 'marbles' task examining decision-making under uncertainty and impulsivity. Participants sample colored marbles from a hidden urn and must decide which of two urns (with different color distributions) is being used. More evidence-gathering improves accuracy but costs points.
Test Details
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Data Output
Creates one data file: urns-<subnum>.csv with trial-level data including subnum, trial number, draw limit, true urn type, response, correctness, number of draws taken, decision time, sequence of draws (color evidence), evidence bias (mean of sequence), and total points. Point system includes draw cost, correct bonus, and incorrect penalty to incentivize efficient decision-making.
About This Test
An 'urns' or 'marbles' task examining decision-making under uncertainty and impulsivity. Participants sample colored marbles from a hidden urn and must decide which of two urns (with different color distributions) is being used. More evidence-gathering improves accuracy but costs points.
Category: Risk & Decision Making
Estimated Duration: 12 minutes
Available Translations: 1 language
Documentation Sources:
Test implementation, Parameter schema
Documentation Status: Standard