Oddball Task
System Requirements
Minimum: 1024×768
Recommended: 1280×800
May be challenging for colorblind participants
Description
The PEBL OddBall Task
About This Test
A response conflict task where participants respond to red circles and squares appearing on the left or right side of the screen. The standard mapping is: circle → left shift key, square → right shift key. Most trials (90%) are 'coherent' with circles on left and squares on right. The remaining 10% are 'oddball' trials where the stimulus appears on the incongruent side (circle on right or square on left), requiring participants to override the spatial response tendency. Stimuli appear for 500ms with a 2500ms response window. Practice trials provide feedback.
Test Details
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Scientific Background
Original Task References:
These references describe the original task that this PEBL implementation is based on.
- Huettel, S. A., & McCarthy, G. (2004). What is odd in the oddball task?:: Prefrontal cortex is activated by dynamic changes in response strategy. Neuropsychologia, 42(3), 379-386.
Data Output
Creates multiple data files: (1) oddball-<subnum>.csv with trial-by-trial data containing columns: subnum (participant code), block (block number), trial (trial number), practice (1=practice trial, 0=test trial), targdir (target type: 1=circle, 2=square), oddballcoherence (side of presentation: -1=left, 1=right), oddballdir (whether trial is oddball: 1=oddball when circle on right or square on left, 0=coherent when circle on left or square on right), time0 (absolute trial start time in ms), resp (participant response: '<lshift>', '<rshift>', or '<timeout>'), corr (trial accuracy: 1=correct, 0=incorrect), rt (response time in ms from stimulus onset); (2) oddball-report-<subnum>.txt containing text summary with total errors, mean accuracy, mean RT, oddball cost (RT difference between oddball and coherent trials), and RT/accuracy statistics by oddball type; (3) oddball-pooled.csv with all trials pooled across participants; (4) oddball-log.csv with session log; (5) oddball-all.csv with summary statistics across participants.
About This Test
The PEBL OddBall Task
Category: Attention
Estimated Duration: 5 minutes
Available Translations: 2 languages
Documentation Sources:
Test description file, Test implementation, Parameter schema
Documentation Status: Complete