Toulouse N-back Task (TNT)
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).
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.
Measures: Working memory capacity, executive function, attention, mental arithmetic, n-back performance
- Task includes training examples for each n-back level before the main experiment
- Blocks are presented in random order with 2 repetitions of each condition (0/1/2-back)
- Rest periods (countdown timers) separate active blocks
- Arithmetic problems are pre-generated from fixed stimulus lists to ensure consistency
- Feedback (correct/incorrect/too slow) is provided during training examples only
| isiTimeSecs | Inter-stimulus time in MS (default: 1000) |
| StimulusDuration | Presentation time of stimulus(ms) (default: 2500) |
| numStimsAct | Number of displayed stimulus by participant(max.12) (default: 12) |
| numStimsRest | Number of rest stimulus '00+00'(max.6) (default: 6) |
| InstructionTextSize | Text size for instructions (default: 60) |
| InstructionTextSize2 | Text size for instructions (default: 25) |
| TaskTextSize | Text size for task (default: 65) |
| InstructionDisplayTime | Display time of instructions with countdown (default: 5) |
| responsemode | Response input mode (default: auto) |
| Validation | validated |
| Psychometric data | Available |
| Normative data | Not available |