Window-Opening Readiness Assessment¶

Readiness assessment — instantiates Critical-Window Intervention Timing

Reads readiness signals against a preset opening criterion to declare when a receiving system has actually entered its high-malleability window — separating true receptivity from a calendar date.

Acting too early wastes the intervention on a system that cannot yet absorb it; the hard part is knowing the difference. Window-Opening Readiness Assessment is the detector that watches for the leading edge of receptivity and converts a set of ambiguous readiness signals into a single, defensible call: open now, or not yet. Its defining move is to gate the start on evidence of malleability in this particular system, not on a scheduled date — it applies a preset opening criterion to observed signals so that a fixed calendar can never masquerade as receptivity. It says nothing about how wide the window is or how the receptivity curve is shaped; it only decides that the near edge has been crossed and the delivery machinery may begin.

Example¶

A stroke rehabilitation team wants to begin intensive motor retraining the moment a patient enters the early post-stroke recovery period, when the brain is transiently most plastic.^[1] They deliberately do not start on a fixed post-operative day. Instead the assessment tracks a small panel of readiness signals — return of the first flicker of voluntary movement in the affected limb, medical and hemodynamic stability, and enough arousal and attention for the patient to engage in a task — and applies a criterion: intensive training opens only when all three hold on two consecutive checks.

For one patient the signals cross on day 6; for another, not until day 15. The assessment fires accordingly, handing each case to the exposure protocol at the individually-right moment rather than on a ward-wide schedule. The output is deliberately binary and reasoned: "open — voluntary flicker present, stable, engaging," which is exactly what the delivery step needs and nothing more.

How it works¶

The assessment reads several readiness signals at once rather than trusting any single tell, then tests them against a preset opening criterion — a threshold or logical rule fixed before the observation, so the call cannot be quietly retrofitted to a decision already made. It emits an open / not-yet verdict with the signals that justified it, and by construction it distinguishes signal-based receptivity from mere availability or a due date. It hands off immediately once it fires: sizing the window and shaping delivery belong to other mechanisms.

Tuning parameters¶

Signal breadth — how many independent readiness signals must agree. More signals cut false opens but slow the call and can miss a fast opener.
Criterion strictness — how high the bar sits. A strict criterion avoids starting on a system that only looks ready but delays real openings; a loose one starts sooner at the cost of wasted early exposure.
Confirmation cadence — one reading versus repeated confirmation. Requiring consecutive positive checks suppresses noise but adds lag.
Baseline reference — whether "ready" is judged against a population norm or this individual's own trajectory; individual baselines catch atypical timing that a norm would misclassify.

When it helps, and when it misleads¶

It is at its best when receptivity genuinely varies case to case and the cost of mistiming the start is high — it replaces "everyone begins in week two" with a per-case trigger grounded in observed malleability. Its honest failure mode is criterion mis-set: too strict and true openings are missed while the window narrows; too loose and the intervention is spent on a system that cannot yet hold it. The classic misuse is running it backwards — declaring a system "ready" to justify launching a program that was already scheduled and funded, letting the calendar wear the mask of receptivity. The discipline that guards against this is to fix the criterion before observing, require a signal rather than a date, and treat a not-yet as a real answer, not an obstacle.

A quieter hazard is equity: a single readiness bar can systematically exclude late-maturing individuals who would still benefit. Where that risk is live, the call should defer to a subgroup-aware profile rather than one universal threshold.

How it implements the components¶

readiness_signal — it defines, collects, and combines the observable signals that indicate the receiving system is entering its malleable state.
window_opening_criterion — it holds the preset threshold/logic that turns those signals into an open decision.

It does not model the receptivity curve or its uncertainty (receptivity_profile, critical_window_model — see Receptivity-Curve Estimation), does not supply the underlying biomarkers (surrogate_receptivity_marker — see Developmental Milestone and Biomarker Panel), and does not deliver anything into the window (intervention_window, timing_rule — see Time-Locked Exposure Protocol).

Instantiates: Critical-Window Intervention Timing — it supplies the go-signal on which every downstream delivery step waits.
Consumes: Developmental Milestone and Biomarker Panel supplies the raw markers this assessment reads.
Sibling mechanisms: Time-Locked Exposure Protocol · Window-Closure Review · Receptivity-Curve Estimation · Developmental Milestone and Biomarker Panel · Within-Window Dose and Cadence Titration · Adaptive Window Re-estimation

Notes¶

The assessment detects only the near edge. The far edge — whether the window has since closed — is a separate judgment made by Window-Closure Review; keeping opening and closure as distinct calls prevents a single "timing" step from silently drifting from start now to too late without anyone re-deciding.

References¶

[1] A sensitive period is a bounded interval in which a system is unusually able to acquire a durable configuration from experience. Operationalizing its onset from observed signals — rather than assuming a fixed calendar age — is exactly what this assessment does, and is the standard guard against treating group-average timing as an individual deadline. ↩