Toulouse N-back Task (TNT)
System Requirements
Minimum: 1280×800
Recommended: 1280×800
Description
Working memory task that requires participants to monitor and respond to arithmetic problems, comparing current stimuli to those presented n trials back (0-back, 1-back, or 2-back conditions).
About This Test
Participants view a series of simple arithmetic problems (e.g., '20+30', '95-50') and press the right arrow key when the current problem matches a target (0-back: equals 50; 1-back: same result as previous problem; 2-back: same result as two problems back). Left arrow indicates non-target. The task begins with examples of each condition, then presents 0-back, 1-back, and 2-back blocks in randomized order (2 repetitions each) with rest periods between blocks. Each block contains 12 active stimuli and feedback is provided during training.
Test Details
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Scientific Background
Original Task References:
These references describe the original task that this PEBL implementation is based on.
- Mandrick, K., Peysakhovich, V., Rémy, F., Lepron, E., & Causse, M. (2016). Neural and psychophysiological correlates of human performance under stress and high mental workload. Biological psychology, 121, 62-73.
PEBL-Specific References:
These studies used the PEBL version of this task.
- Hu M., Mouratille D., Imbert J.-P., & Causse M. (Year unknown). PEBL adaptation of the Toulouse N-back Task. Computer software.
Data Output
Creates two data files: (1) TNT-Details-<SUBNUM>.csv with trial-level data including n-back condition, trial number, target status, response, reaction time, and response classification; (2) TNT-Report-<SUBNUM>.txt with block-level summary statistics including accuracy metrics (true/false positives/negatives) and mean reaction times for correct/incorrect responses.
Example Data
example-data-details.csv Primary
Trial-by-trial data with columns: subnum, type (zero/one/two for n-back level), trialnum, target (0=non-target, 1=target), resp (0=left arrow, 1=right arrow), rT (reaction time in ms), resptype (true positive/negative, false positive/negative)
| subnum | type | trialnum | target | resp | rT | resptype |
|---|---|---|---|---|---|---|
| example | zero | 2 | 1 | 0 | 2196 | false negative |
| example | zero | 3 | 0 | 0 | 1547 | true negative |
| example | zero | 4 | 1 | 1 | 824 | true positive |
| example | zero | 5 | 0 | 0 | 1219 | true negative |
| example | zero | 6 | 0 | 0 | 1371 | true negative |
| example | zero | 7 | 0 | 0 | 1247 | true negative |
| example | zero | 8 | 1 | 1 | 1104 | true positive |
| example | zero | 9 | 0 | 0 | 1018 | true negative |
| example | zero | 10 | 0 | 0 | 1003 | true negative |
example-data-report.txt Summary
Summary statistics for each block including: participant number, n-back type, target amount, number of misses, correct/incorrect responses, true/false positives/negatives, mean RT for correct and incorrect responses
| Participant number : example |
|---|
| Type : zero-back |
| Target Amount 4 |
| Number of misses : 0 |
| Number of correct responses : 10 |
| Number of incorrect responses : 2 |
| Number of true positives : 3 |
| Number of true negatives : 7 |
| Number of false positives : 1 |
| Number of false negatives : 1 |
Sample data showing typical output format. Actual values will vary by participant.
About This Test
Working memory task that requires participants to monitor and respond to arithmetic problems, comparing current stimuli to those presented n trials back (0-back, 1-back, or 2-back conditions).
Category: Memory
Estimated Duration: 15 minutes
Available Translations: 7 languages
Documentation Sources:
Test description file, Test implementation, Parameter schema
Documentation Status: Standard