diff --git a/elements/neuron/appunti/2026-06-30-logic-principles-of-the-expression_v4.md b/elements/neuron/appunti/2026-06-30-logic-principles-of-the-expression_v4.md
index 6bfd663..9880ec3 100644
--- a/elements/neuron/appunti/2026-06-30-logic-principles-of-the-expression_v4.md
+++ b/elements/neuron/appunti/2026-06-30-logic-principles-of-the-expression_v4.md
@@ -427,6 +427,22 @@ The order around the ring is ACTION → EVALUATION → PREPARATION → ACTION. B
 phase is first; each turn's preparation feeds the next turn's action, and each turn's evaluation
 reads the action that preceded it.
 
+**The ring is necessary; its co-location in one component is not.** What the logic guarantees is
+that the ring *closes* — that every action is evaluated and every action is prepared for — not that
+any single component runs all three phases itself. A component necessarily has ACTION: the local
+act it performs is what makes it a component at all. But the EVALUATION and PREPARATION of that act
+may live in *other* components. Take the calcium channel as a component: its ACTION is letting Ca²⁺
+in — that is its whole local act. It does not evaluate whether the influx mattered (the presynapse
+does, reading the resulting trace) nor prepare its own next opening (its coupling readiness is set
+by presynaptic short-term potentiation, and above that by neuronal provisioning). The channel is
+almost pure action; its evaluation and preparation sit in the components around and above it. Yet
+the ring is intact — the influx is acted, evaluated, and prepared for — merely spread across three
+components rather than turned within one. So the ring is a property of *coupled components*, not of
+the individual: a component contributes its action, its neighbors and superiors contribute the
+evaluation and preparation that action requires, and together they close a ring none of them runs
+alone. This is the same frame as category I — there is no ring-bearing "self," only local
+components whose coupled actions we describe as one closing ring.
+
 **The phases are event-delimited and decay-timed, never clocked.** A phase has no fixed duration.
 The action is the boundary where preparation ends and behaving begins; the fast trace's decay below
 threshold is roughly where evaluation ends and preparation resumes. The quiet interval between