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- §4.1 Language honesty: every language states how its core vocabulary was obtained (CoreStatus); an absent status reads as GlossOnly; glosses are never presented as a language's core. Withdraws the claim that one ~400-word core covers ~80% of every language. - §5.1 Timing belongs to the person: scan rate and dwell are theirs to set; automatic adaptation is off unless they opt in; changes are proposed, never silent. - §5.2 Scan-rate floor: max(⌊100·M/65⌋, P95), from at least 10 responses. The previous reference set 80% of the mean press, so the highlight had usually moved on when the person pressed. - §5.3 Dwell proposals go both ways, with floors, replacing "should adapt to fatigue" (the old reference only ever lengthened the dwell). - §10 adds C5–C7; §11 says access and vocabulary choices are never a prerequisite for starting. - spec/access_model.md, the lexicon and the ontology agree (new CoreStatus class and individuals; scanRateMs, dwellMs, adaptationOptIn; Turtle, SHACL and JSON-LD validated with rdflib). New aac-rs/README.md covers testing, the static build, and hosting Express under another site. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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AAC lexicon (v1)
The controlled vocabulary of the AAC standard. Terms are stable; their IRIs live in v1.ttl under https://aac.transaction.science/vocab/v1#.
| Term | Meaning |
|---|---|
| Utterance | The cargo AAC carries: what a non-speaking person means to say, composed by selecting cells. |
| Board | A communication surface holding cells, of a given board type. The portable unit a voice travels as. |
| Board type | Grid | VisualScene | Keyboard | Hybrid | QuickAccess. A rendering + vocabulary-strategy marker. |
| Cell | A single selectable target at a fixed grid position, with content and an action. |
| Position | (row, col), 0-indexed. Assigned once and immutable for the life of the cell — the motor invariant. |
| Motor stability | The guarantee that cell positions never move except by explicit edit. Muscle memory is sacred. |
| Cell content | Symbol{id,label} | Text | Photo{ref,label} | Blank. Blank is an addressable reservation of geometry. |
| Cell action | What activation does: Speak | Navigate | Modifier | Backspace | Clear | Predict | SpeakAll | Buffer. |
| Symbol | A pictographic word referenced by source and id — not embedded pixels — so a board stays small and portable. |
| Access method | The physical channel of selection: DirectTouch | EyeGaze | HeadTracking | SwitchScan{n} | Joystick | Bci | PartialVoice | Pointer. |
| Motor profile | The user's physical capabilities (fine motor, sustained press, tremor, target size, reach, side) used to adapt targets and timing. |
| Scan mode | The switch-scanning pattern: Linear | RowColumn | Group | Block | inverse. |
| Dwell | Selection by sustained gaze, with visible progress feedback and a dwell time the person sets. |
| Timing proposal | A change of scan rate or dwell time that a client computes from the person's own responses and offers; it takes effect only when they accept it, or automatically if they opted in. Timing never changes silently. |
| Core status | How a language's core vocabulary was obtained: ValidatedNativeCorpus (studied in the language) | StakeholderValidated (rated by its speakers) | PrimesOnly (provisional seed) | GlossOnly (glosses of another language's core). Absent means GlossOnly. |
| Vocabulary level | Emergent | Transitional | Conventional | Literate — the user's stage, which selects the prediction tier. |
| Cascade | L0:Cache → L1:Symbol → L2:LocalPredict → … → L9:AdaptiveModel. The lowest level that closes a request wins. |
| Offline invariant | Exactly L0–L2 are offline-capable and carry 95%+ of communication; a network drop never silences a user. |
| Free invariant | No cascade level is gated behind payment at the protocol layer. A voice is not a metered good. |
| Interchange | Canonical export + one-directional ingest of existing boards. What goes in comes out; no lock-in. |
| Receipt | The per-operation energy record (measured + estimated µJ, provenance-tagged) — shown for transparency, never billed. |
| Provenance | HwShunt (hardware-measured) | ModelBased (calibrated model) | Estimator (constant). The honesty tag on every reading. |
| Steward | Transaction Science: publishes the spec, ships the reference, runs optional services (symbol libraries, voice banking, team coordination). Not the owner — AAC carries no token. |