Number Stroop Task
System Requirements
Minimum: 800×600
Recommended: 1280×800
Description
Numerical Stroop task where participants count items (1-3) while suppressing prepotent digit reading. Tests interference between counting and number naming.
About This Test
Modeled after Hernandez et al. (2010). Participants indicate how many items (1-3) appear on each trial by pressing keys 1, 2, or 3. Items can be: (a) neutral alphabetic characters (e.g., Z, GGG, MM), (b) congruent digits matching the quantity (e.g., 1, 22, 333), or (c) incongruent digits not matching the quantity (e.g., 2, 33, 111). Each trial shows a fixation cross (1000ms) followed by the stimulus (up to 2000ms or until response). Supports keyboard, keypad, or audio response modes. Practice trials provide feedback.
Test Details
stroop-numbernumber-stroop.pbl🚀 Try Without Registration
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Data Output
Creates multiple data files depending on response mode: (1) numstroop-<responsetype>-<subnum>.csv with trial-by-trial data containing columns: subnum (participant code), response [col 2] (response mode: 'keyboard', 'keypad', or 'audio'), code (participant code), block (block identifier), trial (trial number), stim (stimulus displayed: e.g., '111', 'ZZZ', '2'), cond (trial condition: 'C'=congruent, 'I'=incongruent, 'N'=neutral), responded (whether response was made: 1=yes, 0=timeout), response [col 9] (participant response: 1-3 or -1 if audio mode without real-time scoring), correct (trial accuracy: 1=correct, 0=incorrect, -1=not scored), abstime (trial start time in ms), rt (response time in ms), speechduration (for audio mode: duration of speech in ms, 0 for keyboard/keypad), recordtime (total recording time in ms); (2) numstroop-<responsetype>-summary-<subnum>.txt containing text summary with total errors, incongruency errors, random errors, and mean RT and accuracy by condition (C/I/N); (3) numstroop-<responsetype>-pooled.csv with all trials pooled across participants; (4) numstroop-sumall.csv with summary statistics across all participants. For audio mode, individual trial audio files may be saved as WAV files if saveAudio parameter is enabled.
Example Data
| subnum | test | response | code | block | trial | stim | cond | responded | response | correct | abstime | rt | speechduration | recordtime |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 19 | number-stroop | keyboard | data/19/trial-000- | 0 | 0 | G | N | 1 | 1 | 1 | 22399 | 1275 | 0 | 1275 |
| 19 | number-stroop | keyboard | data/19/trial-001- | 0 | 1 | 333 | C | 1 | 3 | 1 | 25187 | 732 | 0 | 732 |
| 19 | number-stroop | keyboard | data/19/trial-002- | 0 | 2 | 3 | I | 1 | 3 | 0 | 27432 | 461 | 0 | 461 |
| 19 | number-stroop | keyboard | data/19/trial-003- | 0 | 3 | MMM | N | 1 | 3 | 1 | 29406 | 609 | 0 | 609 |
| 19 | number-stroop | keyboard | data/19/trial-004- | 0 | 4 | GG | N | 1 | 2 | 1 | 31538 | 554 | 0 | 554 |
| 19 | number-stroop | keyboard | data/19/trial-005- | 0 | 5 | 111 | I | 1 | 3 | 1 | 33606 | 761 | 0 | 761 |
| 19 | number-stroop | keyboard | data/19/trial-006- | 0 | 6 | 2 | I | 1 | 1 | 1 | 35882 | 983 | 0 | 983 |
| 19 | number-stroop | keyboard | data/19/trial-007- | 0 | 7 | 22 | C | 1 | 2 | 1 | 38378 | 607 | 0 | 607 |
| 19 | number-stroop | keyboard | data/19/trial-008- | 0 | 8 | 33 | I | 1 | 2 | 1 | 40498 | 625 | 0 | 625 |
Sample data showing typical output format. Actual values will vary by participant.
About This Test
Numerical Stroop task where participants count items (1-3) while suppressing prepotent digit reading. Tests interference between counting and number naming.
Category: Executive Function
Estimated Duration: 8 minutes
Available Translations: 3 languages
Documentation Sources:
Test description file, Test implementation, Parameter schema
Documentation Status: Complete