Dual-Task Interference Test
Multi-task performance test measuring dual-task interference by comparing single-task and dual-task performance on two independent response dimensions.
Participants respond to visual stimuli that vary along two dimensions (e.g., arrow direction and position). In single-task blocks, they respond to only one dimension. In dual-task blocks, they respond to both dimensions simultaneously using different hands. The task measures how performance on each dimension is affected by the need to process and respond to the other dimension, quantifying dual-task interference. The test supports four stimulus types: circle/square + size, arrow direction + size, double arrows (no offset), and double arrows (offset).
Measures: Dual-task processing, multi-task interference, divided attention, executive control, response coordination
- Task includes three block types per round: single-task dimension 1, single-task dimension 2, and dual-task (both dimensions)
- Optional yoked mode (doyoked=1) adds fourth block type requiring simultaneous responses (within 50ms)
- Default configuration: 4 rounds = 12 blocks total (3 blocks/round) or 16 blocks if yoked mode enabled
- Event-driven response system allows responses in any order during dual-task trials
- Response keys are conditionally registered based on trial type (single vs dual)
- Supports four stimulus types with different visual dimensions and interference levels
- Semantic response mapping (DIM1A/DIM1B/DIM2A/DIM2B) for consistent data output regardless of key configuration
- Block progress indicator shows current block out of total blocks
- Adaptive header text box wraps long instructions for better readability
| numrounds | Number of complete round-robins (pure1, pure2, dual) (default: 4) |
| trialsperblock | Number of trials in each block (default: 25) |
| smallsize | Size in pixels for small stimuli (default: 65) |
| largesize | Size in pixels for large stimuli (default: 160) |
| doyoked | Include yoked dual-task trials (respond simultaneously) (default: 0) |
| stimtype | Type of visual stimulus (default: 4) |
| type4offset | Horizontal offset for type 4 stimuli (pixels) (default: 40) |
| dim1keys | Response keys for dimension 1 (left hand) (default: Array) |
| dim2keys | Response keys for dimension 2 (right hand) (default: Array) |
| responsemode | Layout response mode (none for custom handling) (default: none) |
| Validation | research |
| Psychometric data | Not available |
| Normative data | Not available |
| subnum | stimtype | block | trialtype | trial | condition | stim | dim1 | dim2 | time0 | resp1 | rt1 | corr1 | resp2 | rt2 | corr2 | tooslow |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| example | 4 | 1 | PRACTICE | -25 | 1 | 2 | 0 | 1 | 8145 | DIM1A | 1661 | 0 | NA | 0 | 0 | 0 |
| example | 4 | 1 | PRACTICE | -24 | 1 | 4 | 0 | 0 | 11540 | DIM1A | 949 | 0 | NA | 0 | 0 | 0 |
| example | 4 | 1 | PRACTICE | -23 | 1 | 1 | 1 | 1 | 13800 | DIM1A | 575 | 1 | NA | 0 | 0 | 0 |
| example | 4 | 1 | PRACTICE | -22 | 1 | 3 | 1 | 0 | 15584 | DIM1A | 865 | 1 | NA | 0 | 0 | 0 |
| example | 4 | 1 | PRACTICE | -21 | 1 | 2 | 0 | 1 | 17713 | DIM1B | 424 | 1 | NA | 0 | 0 | 0 |