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The Logic of the Tripartite Synapse Model — v5
A synthesis of the principles the pseudocode enacts. This version is reorganized top-down: it opens with the single principle everything specializes, then descends through six categories, each presented as a facet of that principle rather than a separate idea. Where earlier versions built bottom-up toward a conclusion, this one hands over the key first and shows each category turning it.
What changed in v5. The old "evaluation" phase is retired — it was always preparation aimed at the other scope. The ring is recut into three categories: ACTION, RECOVERY, PREPARATION. The obsolete subject-mapping (lateral/local/vertical) is dropped. New findings are folded in: the rhythm is (ACTION ⇄ RECOVERY) × many, then PREPARATION; every category spans all timescales; night PREPARATION replays the day ACTION with the same machinery; build and release compete within a component while material competes between components; there are two independent forgettings; and collaboration by day versus competition by night follows from the rivalry of each scope's currency. Nine categories are consolidated to six.
The Unifying Principle
Watch one presynaptic bouton for a day and a night. By day it releases neurotransmitter, restocks its vesicles so it can release again, and — in the quiet after a burst — stocks a trace that records how much this release mattered. By night it does the same three things at a slower tempo: it changes its structure, restocks the material to change again, and replays the release as a probe to measure whether the change is still warranted. Nothing supervises it. It reads only its own state and the signals that reach it. What we call the synapse, the neuron, the memory, the organism is nowhere inside the bouton — it is only the name we give to many such boutons, coupled.
That is the whole model in one instance. Stated generally:
There is only the local component and its one repeating act. Everything we call a system — the synapse, the neuron, the assembly, the organism — is that act, multiplied and coupled, and described from outside. The act has one shape (act, recover, prepare) run in two directions (outward by day, inward by night), and the relations between components are set by what is scarce. Holism is real, but it is enacted by the coupling, never encoded in any part.
Every category below is this principle, turned to face one question: What is a component? (locality), What is its act? (the ring), What are its two directions? (the two turnings), At what speeds does it act? (the ladder), How do components relate? (scarcity), and Who is in charge? (causation — no one). None adds a new assumption; each specializes the one above.
A note on language. This document does not say "the system." There is no system — only local components, contextualized by their neighbors. Where the phrase appears, it is inside quotation marks, naming the thing we are denying: an actor that stands above the parts, holds the whole, and acts on it. No such actor exists here.
1. Locality — The Only Thing That Exists Is a Local Component
Everything the model contains is a local component: the bouton, the spine, the astrocytic process, the dendrite, the soma, the axon. The actors we call higher — neuron, astrocyte, organism — are not additional things. They are descriptions of many components' coupled activity, spoken from outside. This is the direct reading of the unifying principle, and the rest of the category is its mechanics.
A component reads only its own state and the signals that arrive. It cannot read another component's interior, and it cannot read "the whole." When the bouton needs to know whether its release reached a responsive target, it does not inspect the spine; it waits for a retrograde signal the spine emitted. Coordination is never achieved by a component consulting a global state, because there is no global state to consult. It is achieved by signals crossing between components, each read locally and made to mean something by the local context that receives it.
Everything emits; nothing is a pure sink. A component that only consumed would be invisible to the rest and could not participate in coordination. Even the leaves of the daytime chain — the bouton, the spine — emit: by day they emit fatigue upward and retrograde messages laterally; by night they emit freed material into the shared pool and demand upward. To exist in the model is to be readable, and to be readable is to emit.
Coupling is openness, and openness is bounded. A component is open — it takes in signals and supply, gives out signals and product — but its openness is bounded by what it can physically reach: its own cleft, its own supply lines, the neighbors it is wired to. It is neither sealed (that would make coordination impossible) nor unbounded (that would make it the whole). The bounded openness is what lets many local components compose into something we can describe as a whole without any of them being that whole.
Holism is real but only described. The re-evoked pattern at night, the neuron's total activity, the memory a synapse carries — these are real. But they are not stored anywhere. The pattern is not in any component; it is what happens when many primed components ignite each other. The neuron's "excitability" is not computed by anyone; it is the coincidence of many components' own lowered thresholds. Holism is enacted by the coupling and read off by us as observers — it is never encoded in a part, because if it were, that part would be the system, and there is no system.
2. The Ring — One Act in Three Phases
The local component's act has one shape, and it is the same shape everywhere: ACTION, RECOVERY, PREPARATION. This is the specialization of the principle to the question what is the act?
The three phases.
- ACTION is the component's defining deed — the thing that makes it the component it is. The bouton releases; the soma fires; the spine responds; the axon and dendrite propagate. Action is the only phase that spends irreversibly and reaches outside the component.
- RECOVERY is the fast alter-ego of action: it restores the capacity to act again. Vesicles refill, sodium channels de-inactivate, calcium clears. Recovery undoes the local depletion the action caused, so a next action is possible. It looks backward — it repairs what was just spent.
- PREPARATION shapes what comes next. It faces two futures at once: the next action in this same scope, and the action of the other scope. Setting the release machinery for the next spike is preparation for this scope; stocking the tag that the night will spend is preparation for the other. Preparation is provisioning, not judging — which is why the old "evaluation" phase was a misnomer and has been retired. Depositing a trace does not render a verdict; it lays down a provision that a later phase may or may not draw on. What we once called evaluation was always preparation aimed at the other scope.
The rhythm is (ACTION ⇄ RECOVERY) × many, then PREPARATION — then again. The act is not one pass through three phases. Action and recovery alternate rapidly — a tight inner loop, release-and-restock many times over — and only when that alternation subsides does preparation run, punctuating the bout and setting up the next. A spike train is exactly this: release ⇄ refill, release ⇄ refill, then, in the sustained quiet, the preparation that stocks the tag and tunes the next train. The inner loop is fast; preparation is the slower punctuation.
Every category spans all three timescales. The three phases are not three speeds. Each phase is a kind of work — deed, restore-capacity, provision — and each kind happens fast, medium, and slow. Preparation especially is multi-timescale: it contains a fast loop (probe and restock), a medium adjustment (tuning the release machinery from the tag), and a slow settling. A category names what kind of work, never how fast.
Action is always local; recovery and preparation may be contextual. A component necessarily has its own action — the deed just is the local event occurring in it, and it cannot be performed on another's behalf (that would be signalling, not acting). But the recovery and preparation of an action can live in other components. A calcium channel's action is letting calcium in; its evaluation-and-preparation live in the presynapse and above. So the ring is a property of coupled components, not of the individual: the ring must close — every action recovered from and prepared for — but no single component need run all three phases itself. What is necessary is the closing of the ring, not its co-location.
3. The Two Turnings — Day and Night
The one ring is turned in two directions. This specializes the principle to what are the component's two scopes? — and it is where the model's deepest duality lives.
Two contextualizations, two currencies. By day the component faces outward, against the world (the cleft); its currency is information — cheap, gathered passively, and non-rival (see category 5). By night it faces inward, against the economy; its currency is material and energy — scarce, conserved, and rival. The component does not know it is in "day" or "night" as a global state; each turning simply runs against whatever environment is present, and the environment differs.
The rotation: the same physical event is a different phase in each scope. This is the sharpest form of the duality. Neurotransmitter release is the day's ACTION — the outward deed. The same release, run at night, is PREPARATION: the component releases not to transmit but as a probe, to replay a behavior and measure how much it participates in the re-evoked pattern. And the structural change, which the day can only mark (the tag is an inert claim pointing at a restructuring that never happens by day), is the night's ACTION — its irreversible defining deed. So the defining act of one scope is the measuring-instrument of the other: release is day-action / night-preparation; restructuring is night-action / day-inert-mark. The scopes do not merely run the ring in two directions — they swap which event is the deed and which is the provisioning. Because it is a ring, each scope simply enters at a different phase.
Night PREPARATION replays the day ACTION — the same machinery. Because preparation-at-night is a replay of the behavior, it runs the very code the day action runs: the same release, the same capacity and vesicle checks, the same endurance deposit into the same trace. Endurance discovered in replay is as real as endurance discovered in behaving. Only two things differ: there is no dopamine (significance is already settled), and the released transmitter is a probe — it carries the pattern onward to the next component and its own trace is read as participation. The action machinery is written once and serves as the deed by day and the measurement by night.
The tag is the payload that crosses between the turnings; the fatigue loop is the switch. Each scope's PREPARATION mints what the other scope will consume. Day-preparation mints the tag — a token of confirmed significance — which the night spends on structure. Night-preparation measures participation, which gates that spending. The tag is one token with three roles: by day it is the significance bridge; at night it lowers the component's own threshold so its pattern can re-ignite, and it funds the build, a slice at a time. Distinct from this payload handoff is the switch — the fatigue loop that decides when a component crosses between scopes. Activity accrues fatigue; a single continuous integrator (the one actor that never sleeps) reads the aggregate fatigue and emits a pressure; when a component's own activity falls and pressure is high, it crosses into night; when pressure discharges, it crosses back. No scheduler; no clock. The switch says when to turn; the tag says what crosses when it turns. One ring, two turnings, stitched by the tag and switched by fatigue.
Two independent forgettings. Because night ACTION is build ⇄ release (category 5), two distinct things can be lost, by two distinct mechanisms. Structural pruning sheds built structure a component no longer uses — driven by low participation, regardless of any tag it holds. Intention decay is the tag itself decaying unspent — a planned strengthening that never found the participation to license it. The tag is patient: it is sliced by building and never touched by releasing, so it survives across non-participating cycles and cashes in when its pattern finally re-evokes. Disuse prunes structure; unspent intention fades on its own slow clock. The two are independent, and both are forgetting.
4. The Timescale Ladder
Orthogonal to the ring is the ladder of timescales. This specializes the principle to at what speeds does the component act? The ring says what kind of work; the ladder says how fast; they compose — every phase of the ring occurs at every rung of the ladder.
The rungs. FAST (milliseconds to seconds): the immediate trace a single action leaves. MEDIUM (seconds to minutes): occupancy and evidence — the running average of fast traces, and the eligibility climbing toward a tag. SLOW (hours): the tag, the consolidation bridge. PERSISTENT (written only at night): the structural ceilings, and the two conserved stocks — energy, which does not return, and material, which does.
A tier's timescale is set by both its creation and its decay. A fast trace is deposited as a point event and relaxes in milliseconds. A medium trace ramps while a condition holds and settles over minutes. The timescale is not a label attached to a variable; it is the joint consequence of how the variable is written and how it fades. This is why the same climb appears in every component: each action leaves a fast trace; the average of fast traces over seconds fills occupancy (short-term strength); the average of that average over minutes, gated by dopamine, raises the tag. Occupancy is the fast-and-medium memory of participation; the tag is its slow, validated distillate.
Evidence ascends the ladder; capacity descends it. By day, information climbs from fast trace to tag — evidence accumulating upward. By night, capacity is written downward from the tag into persistent structure. Each rung also has its own failure meaning, set by its timescale: a fast pool running dry is transient depression; a medium pool constrained is a standing endurance need; a persistent ceiling reached is a structural limit. Depletion and recovery at each rung mirror the creation and decay of its trace — the same timescale governs both the evidence and the capacity at that level.
5. Scarcity Decides — Collaboration by Day, Competition by Night
How components relate to one another is not an independent fact; it follows from what is scarce. This specializes the principle to how do components relate? — and it unifies conservation, selection, and the collaboration/competition character of the two scopes into one causal chain.
Two conserved currencies, two rules of flow. Energy ratchets: it is spent irreversibly, the arrow of time in the model — a component that burns energy into structure cannot get it back. Material circulates: it is freed by one component and reclaimed by another, conserved as it moves. Scarcity of both forces choice — two ceilings (structure and endurance) compete for one finite night pool, and what is not maintained drifts back down.
Rivalry of the currency sets the relation. By day the currency is information, which is non-rival: a bouton releasing glutamate does not use up the spine's ability to receive it; a trace here does not deplete a trace there. When producing for others costs nothing, the natural relation is collaboration — and the day is exactly that: each component acts so the next can act, releasing, integrating, clearing, passing activity along the chain, co-producing the pattern and the tags. By night the currency is material and energy, which are rival and conserved: every unit one component builds into its structure is a unit another cannot have, and the total is capped. When what one takes another loses, the natural relation is competition — and the night is exactly that: components contend for the shared pool, build what they win, and free what they shed back into contention.
But night's competition is adjudicated by collaboration. The relation is subtler than "day collaborate, night compete." The replay that arbitrates the night's competition is itself a collaborative act: a pattern re-evokes only if every component along its loop is primed and ignites the next — mechanical coherence, a collaboration all the way around, one un-primed link breaking it. Participation — the measure that gates who gets to build — is a measure of successful collaboration in that re-enactment. So a component earns its share of the scarce material in proportion to how well it collaborated in replaying the pattern. Collaboration is primary in both scopes: by day it produces the shared, non-rival good; by night it adjudicates the competition for the rival one. The register is economic, not martial — components do not fight; they contend for a conserved resource, and the contention is settled fairly by a collaborative criterion.
Two competitions at two loci. Within the night, competition appears twice, cleanly separated. Within a component, build and release contend over its own structure, arbitrated by participation: high participation builds (funded by the tag, a slice per cycle), low participation releases (freeing material, the tag untouched), and in between the component holds. Between components, this one and its peers contend for the shared material and energy during recovery. The internal tension (grow or shrink?) is settled by the replayed pattern; the external tension (can I get material?) is settled by contention with neighbors. Selection under scarcity is the sum of these: what survives a night has both earned its tag by day and won its material by night, and what neither participates nor is maintained returns to the pool. Selection is not a judge's verdict; it is what scarcity leaves standing.
6. Causation Circulates — Emergence Up, Constraint Down, Command Nowhere
The final category specializes the principle to who is in charge? — and the answer is no one. Causation moves in two directions across the coupling, and neither is command.
Emergence ascends; constraint descends. By day, evidence and activity emerge upward: components act locally, and their emitted activity is what a higher description (the neuron, the assembly) is made of. Nothing reaches down to make them act. By night, constraint descends: a higher actor broadcasts a bound — a renormalization target, a downscale factor — but it does not reach in. It emits a signal; each component reads that signal and scales itself. The neuron never edits a synapse; it announces a total, and the synapses each renormalize their own structure against it.
No actor authorizes its own restructuring. A component cannot open its own night. It is put in position by the actor above — which holds an aggregate the component cannot see and opens a window the component cannot open — and then, within that window, the component acts locally on its own state. The soma cannot decide within the soma which of its synapses matter; the synapses decide that locally, by their own thresholds. And the synapses cannot ignite their pattern alone; the soma's firing does that. Each is put in position by the other; neither reads the other's interior. This is the recursive grant: act locally, be enabled hierarchically.
Command is nowhere. There is no actor that both holds the whole and acts on it — that would be the system, and there is no system. What looks like top-down control is always a broadcast constraint scaled locally; what looks like bottom-up assembly is always local emission summed from outside. The neuron that "renormalizes" only announces a number. The assembly that "replays" is only coincident local thresholds propagating through coupling. Causation circulates — up as emergence, down as constraint — but it never concentrates into command. This is the unifying principle in its final form: because there is only the local component and its one act, there is no one to be in charge, and the whole is enacted by the parts, never encoded above them.
Coda — The Six as One
Read downward, the six categories are one principle refracted six ways. A component is local (1); its act has one shape, the ring (2); the ring turns in two directions, day and night (3), at every rung of the timescale ladder (4); the relations between components are set by what is scarce, collaborative where the currency is free and competitive where it is conserved (5); and causation circulates between components without ever concentrating into command (6). Remove any one and the principle loses a facet; none stands apart from it. There is only the local component and its one repeating act — and everything else is that act, multiplied, coupled, and described from outside.