Number Stroop Task
System Requirements
Minimum: 800×600
Recommended: 1280×800
Description
A numerical variant of the Stroop task measuring interference between enumeration and digit reading, requiring participants to report quantity while ignoring digit identity.
About This Test
Modeled after Hernandez et al. (2010). Participants indicate how many items (1-3) appear on screen by pressing keys 1, 2, or 3, regardless of item identity. Stimuli include: (a) neutral letters (Z, MM, GGG), (b) congruent digits matching quantity (1, 22, 333), or (c) incongruent digits mismatching quantity (2, 33, 111). Each trial begins with a fixation cross (1000ms) followed by stimulus presentation (2000ms timeout). The task includes practice with feedback, followed by two test blocks without feedback. Keyboard response mode is standard.
Test Details
stroop-numbernumber-stroop.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.
- Hernandez, A., Caño, A., & Costa, A. (2010). The role of cognitive control in bilingual language switching. Cognitive Psychology, 61(1), 1-24.
- Pavese, A., & Umiltà, C. (1998). Symbolic distance between numerosity and identity modulates Stroop interference. Journal of Experimental Psychology: Human Perception and Performance, 24(5), 1535-1545.
Data Output
Creates multiple data files: (1) numstroop-keyboard-<subnum>.csv with trial-by-trial data, (2) numstroop-keyboard-summary-<subnum>.txt with performance statistics, (3) numstroop-keyboard-pooled.csv combining all participants, and (4) numstroop-sumall.csv with summary statistics.
About This Test
A numerical variant of the Stroop task measuring interference between enumeration and digit reading, requiring participants to report quantity while ignoring digit identity.
Category: Executive Function
Estimated Duration: 10 minutes
Available Translations: 9 languages
Documentation Sources:
Test description file, Test implementation, Parameter schema
Documentation Status: Complete