Chapter 12: Patterns & Modes Hub
This is the one-stop reference for patterns (structure) and modes (behavior).
The 7 Key Components
- Pattern (structure)
- Mode (behavior)
- Technique (block vs point)
- Direction (scan order)
- Timing (scan rate, delays)
- Visualization (highlight style)
- Error Recovery (undo, cancel, back)
Patterns (Structure)
- Linear: Item-by-item scan.
- Row-Column: Rows first, then items within a row.
- Progressive Segmenting / Elimination: Repeatedly split until target remains.
Modes (Behavior)
- Continuous: Smooth, mouse-like movement.
- Probability (PPM): Items scan by likelihood, not position.
- Cause-Effect: Single-item training mode.
- Group-Row-Column: Explicit group stage before rows/columns.
- ColorCode: Two-button Bayesian selection using red/blue assignments.
Probability (PPM) Demo
🎮 Watch how the scan prioritizes likely items first.
PPM is especially useful for AAC where words and letters have strong usage frequency. Use this demo as the reference point for “predictive scanning.”
ColorCode Demo (Two Buttons)
🎮 Press 1 for blue or 2 for red. The system reassigns colors after each click and selects once it’s confident.
This mode is inspired by ColorCode (Daly, 2022): a Bayesian two-button system that uses color assignments and a language model to infer intent. Paper