ruvnet--RuView/v2/crates/ruview-gamma

ruview-gamma — Adaptive Gamma Entrainment (ADR-250)

Governed, deterministic, safety-constrained personalization of 40 Hz-prior multisensory (light + sound) stimulation. Treats 40 Hz as the evidence-based starting prior, then learns each person's safe entrainment response curve using passive RuView sensing, optional EEG, a constrained optimizer, and auditable RuFlo workflows.

Not medical advice / not a medical device. This crate is a research and engineering platform. The only claim it makes is "personalized entrainment optimization" (ruview_gamma::PRODUCT_CLAIM) — never Alzheimer's treatment, amyloid clearance, or any clinical outcome (ADR-250 §19). It performs no hardware actuation: real stimulus delivery, RF sensing, and EEG arrive through external adapters behind feature flags after this governed software core ships (ADR-250 §21, Milestones 2–4).

Why it exists

The field mostly treats 40 Hz as a fixed protocol. But individual brains differ by baseline gamma, arousal, sleep, sensory acuity, medication, age, and comfort (the 2025 PLOS One 36–44 Hz re-evaluation). Fixed 40 Hz (1) assumes one frequency fits all, (2) never verifies entrainment, (3) ignores physiological state, and (4) cannot safely optimize over time. This crate closes that loop.

The safety invariant

No recommendation, calibration step, bandit arm, or closed-loop nudge can ever emit a StimulusParameters outside the SafetyEnvelope. Every emitting path clamps to the envelope and is asserted against SafetyEnvelope::contains in tests. The optimizer never widens the envelope — only an operator constructs a wider one deliberately (ADR-250 §12). Non-finite (NaN/∞) inputs clamp toward the conservative floor, never the cap.

Module map

Module	Role (ADR-250 §)	Highlights
stimulus	§5, §12	StimulusParameters, SafetyEnvelope (validate / clamp / grids)
safety	§12	exclusion screen, latched SafetyMonitor, hard-stop reasons
response	§6, §9, §10	RuViewState, optional EegMeasurement, 20-field PersonResponseVector (RuVector memory) with sticky adverse flag
objective	§7	safe-entrainment score; safety is a hard gate, not a weight; RF-only proxy when EEG absent
simulator	§21 M1	deterministic ChaCha20 frequency_response_curve(person, state, stimulus)
optimizer	§8	Phase-1 calibration sweep, Phase-2 GP + Expected-Improvement, Phase-4 closed-loop control
bandit	§8 P3	LinUCB contextual bandit over envelope-safe arms
session	§11, §13	hashable SessionRecord, reproducible session_hash (SHA-256, quantized canonical form)
ruflo	§11	consent → exclusion → envelope → run → monitor → score → update → witnessed audit; trial/sham mode; clinician export; claim discipline
proof	—	deterministic bundle witness (mirrors nvsim / verify.py)
math	—	dependency-light numerics (erf, normal CDF/PDF, Cholesky, RBF)

Quick start

use ruview_gamma::{
    ruflo::{Consent, RufloGovernor},
    response::RuViewState,
    simulator::{LatentPerson, ResponseSimulator},
    stimulus::{SafetyEnvelope, StimulusParameters},
};

let envelope = SafetyEnvelope::conservative();
let mut gov = RufloGovernor::enroll("subject-001", envelope, &[], Consent::Granted)
    .expect("cleared to participate");

// Milestone 1: drive the governed loop with the deterministic simulator.
let sim = ResponseSimulator::new(42);
let latent = LatentPerson::from_id("subject-001");
let state = RuViewState::calm_baseline();
gov.run_calibration(&sim, &latent, &state, 5.0, 0).unwrap();

let rec = gov.recommend(&StimulusParameters::prior());
assert!(envelope.contains(&rec.stimulus)); // always inside the envelope

Test / validate / benchmark

cargo test  -p ruview-gamma --no-default-features    # 64 unit/integration + 1 doctest
cargo bench -p ruview-gamma --no-default-features     # criterion micro-benchmarks

Determinism is proven, not assumed: proof::Proof::reference_witness() runs a fixed reference participant through the full governed pipeline and pins the bundle SHA-256 (Proof::EXPECTED_WITNESS); the test fails on any silent drift in the optimizer, simulator, response update, or session hashing.

Measured (this container, indicative — not a regression gate)

Bench	Median	Note
gamma_safety_tick	~9.3 ns	vs ADR-250 §17 < 500 ms hard-stop latency bound
gamma_bandit_select	~74 ns	LinUCB decision
gamma_bayesian_recommend	~19 µs	GP + EI over the 0.1 Hz envelope grid (was ~105 µs: the GP is now factorized once per recommend, not once per grid candidate — −81%, bit-identical)
gamma_calibration_sweep	~135 µs	full 9-session enroll → simulate → score → update → witness (was ~486 µs, −71%)

Roadmap (ADR-250 §21)

M1 simulator ✅ · M2 device harness (envelope + e-stop contract) ✅ · M3 RuView state contract ✅ · M4 optional EEG input ✅ · M5 adaptive optimizer (BO + bandit

• closed-loop) ✅ · M6 trial mode (sham/blinding + clinician export) ✅. Hardware actuation, real RF sensing, and real EEG land behind feature-flagged adapters.