HOME › STAGE 6 › 6.1

6.1 — Biology, Physiology, and Neurobiology as Sovereign Systems

Homeostasis · Stress · Neuroendocrine Systems · Autopoiesis · Embodied Cognition · FEP/Active Inference
Bernard Cannon Selye Sterling/Eyer McEwen Maturana/Varela Edelman Damasio Sapolsky Porges (+ critiques) Friston (+ critiques)

Frame

Core claim:
A living organism is a self-producing, self-governing system that must keep itself within a narrow band of viable states across time, under uncertainty and constraint.
Key translation: “Autonomy” is a physiological achievement: a defended interior (milieu), predictive regulation (allostasis), bounded stress responses, and coherent boundary maintenance (autopoiesis).

On-page navigation

0 Living body as self-governing system 1 Homeostasis → Allostasis → Homeorhesis 2 Stress & neuroendocrine architecture 3 Autopoiesis: self-production 4 Embodied cognition: mind as regulation 5 FEP/Active inference: predictive organisms 6 Multi-scale mapping 7 Failure modes LINKS All referenced URLs

Quick start (minimal path)

Read Milieu & homeostasis foundation
Read Allostasis / cost of adaptation
Read Predictive regulation formalization + critique
Reading rule: “resources inserted where they bite”
Each lecture section below has a Resource splice: the most structurally relevant links placed at the exact concept-joint they support (definitions, mechanisms, or critiques).

0 — A living body as self-governing system

autonomy = defended viable state-space
  • Organism = boundary-maintaining process, not a static object.
  • Viability = narrow band of states (temperature, pH, glucose, oxygenation, etc.) defended over time.
  • Uncertainty forces trade-offs: regulation is cost-bearing and selective.
Resource splice homeostasis as condition for freedom

1 — Homeostasis → Allostasis → Homeorhesis

static set-points → dynamic predictive budgets
Move: replace “thermostat set-point” with homeodynamics (bounded oscillations + trade-offs + context shifts).
  • Homeostasis: multi-effector regulation that keeps critical variables within viable bounds.
  • Allostasis: stability through change—anticipatory regulation driven by context predictions and finite energy budgets.
  • Allostatic load: cumulative wear from repeated/chronic allostatic engagement (the cost of adaptation over time).
  • Homeorhesis: stability of trajectories (growth, pregnancy, seasonal cycles)—defending a life-history path, not a single value.
Resource splice definitions + baseline mechanisms
Resource splice allostatic load: canonical + expansions

2 — Stress & the neuroendocrine architecture

sympathoadrenal + HPA + immune cross-talk
  • Selye (GAS): alarm → resistance → exhaustion (time + cost curve).
  • Hormesis: bounded stressors upgrade repair; chronic/uncontrollable stress degrades capacity.
  • Fast axis: sympathoadrenal (seconds-minutes). Slow axis: HPA (minutes-hours; chronic can go tonic).
  • Strategic trade-offs: chronic stress suppresses HPG (fertility), can blunt HPT (thyroid), reduces growth/anabolism.
  • Neuroimmune loop: cytokines ↔ brain; “sickness behavior” as an energy reallocation program.
  • Agency variables (Sapolsky): predictability, control, trappedness = physiology writers of hierarchy.
Resource splice Selye + stress mechanism primers
Resource splice social context → embodied stress
(Lecture/video links for Sapolsky were not provided in your source list; only the above Wikipedia entry is linked here without inventing new URLs.)

3 — Autopoiesis: life as self-production

operational closure · structural coupling · boundary
  • Autopoiesis: a network of processes that produces components that regenerate the network, continuously re-establishing a boundary.
  • Operational closure: environment perturbs; internal organization determines the response.
  • Structural coupling: repeated interactions co-configure organism and niche.
  • Pathologies: immunodeficiency (porous boundary), autoimmunity (self misread), cancer (local subsystem optimizing itself against the whole).
Resource splice primary definition + lineage
Resource splice cybernetics transition: homeostasis → autopoiesis

4 — Embodied cognition: mind as regulation of a living body

interoception · affect · action loops · state gating
  • Edelman: selectionist brain (degeneracy + re-entrant signaling); circuits retained by embodied success/failure.
  • Damasio: somatic markers; feelings as maps of homeostatic state projected into consciousness.
  • Porges: state hierarchy (ventral vagal / sympathetic / dorsal vagal) + neuroception as gatekeeper of social engagement and cognition (with serious critiques).
  • Trauma: strong priors of danger/powerlessness installed into autonomic + cognitive loops; state becomes sticky, slow to update.
Resource splice enaction / embodied mind baseline
Resource splice Polyvagal: primary + adversarial checks
Note on links
Your text referenced Edelman/Damasio/Varela book titles without URLs. This page preserves that constraint: it links only to URLs you supplied and does not invent new ones.

5 — Predictive organisms: Free Energy Principle & Active Inference

generative models · priors · prediction error · action
Core move: homeostasis/allostasis become preferred state distributions encoded as priors; the system acts/learns to remain within its characteristic state-space.
  • Generative model: probabilistic expectations about sensory inputs given hidden states + action.
  • Minimization: update model (perception/learning) and/or act (active inference) to reduce prediction error / variational free energy.
  • Capture vector: reshape priors (reward/threat regimes) so “minimizing error” = conforming to imposed patterns.
  • Critique: FEP can become empirically thin if not specialized into testable process models.
Resource splice primary + accessible overview
Resource splice navigation + critique + meta links (as provided)

6 — Multi-scale sovereign physiology (cell → society)

analogies: budgets · buffers · misclassification · exploitation
  • Homeostasis ↔ budgets & infrastructure (keep essentials within bounds).
  • Allostasis ↔ buffers & reserves (anticipatory adjustment under uncertainty).
  • Allostatic load ↔ hidden debt (wear from repeated adaptation).
  • Autoimmunity ↔ insider-enemy misclassification.
  • Cancer ↔ subsystem exploiting shared resources for local growth.
Resource splice where the analogy stays anchored (not poetic)

7 — Failure modes across layers

coherence ↔ flexibility balance
  • Homeostatic failure: shock, arrhythmia, coma when variables exit viable range.
  • Allostatic overload: chronic hypertension, metabolic syndrome, depression, immune dysregulation.
  • Autopoietic failures: immunodeficiency, autoimmunity, cancer as boundary/identity problems.
  • Embodied cognition failure: dissociation, rigid state-lock, inability to update under safety.
  • Predictive failure: overly strong priors (model dominates evidence) vs overly weak priors (paralysis/uncertainty).
Invariant: pathology emerges when coherence collapses (system dissolves) or flexibility collapses (system can’t adapt).

All links (verbatim URLs referenced in your source)

complete list for swapping / auditing
Each card below corresponds to a URL you provided (including duplicates / “as supplied” items). Titles are the labels used on this page.
[L1]pmc.ncbi.nlm.nih.gov/articles/PMC4669363
A physiologist’s view of homeostasis (PMC)
[L2]ncbi.nlm.nih.gov/books/NBK559138
Physiology, Homeostasis — StatPearls (NCBI)
[L3]en.wikipedia.org/wiki/Allostasis
Allostasis (Wikipedia)
[L4]pmc.ncbi.nlm.nih.gov/articles/PMC4166604
Clarifying roles of homeostasis/allostasis (PMC)
[L5]healthline.com/health/general-adaptation-syndrome
General Adaptation Syndrome (Healthline)
[L6]link.springer.com/book/10.1007/978-94-009-8947-4
Autopoiesis and Cognition (Springer)
[L7]en.wikipedia.org/wiki/Free_energy_principle
Free energy principle (Wikipedia)
[L8]ncbi.nlm.nih.gov/books/NBK349158
Evaluating Hans Selye in modern stress research (NCBI)
[L9]archive.org/details/wisdomofbody0000walt
Cannon — The Wisdom of the Body (Internet Archive)
[L10]jamanetwork.com/.../617820
McEwen & Stellar (1993) — allostatic load (JAMA)
[L11]nejm.org/doi/full/10.1056/NEJM199801153380307
McEwen (1998) — Protective & Damaging Effects… (NEJM)
[L12]direct.mit.edu/.../9780262269674_ccu.pdf
MIT Press Direct — expanded chapter PDF
[L13]nyaspubs.onlinelibrary.wiley.com/.../tb09546.x
Allostasis & allostatic load integration (NYAS/Wiley)
[L14]en.wikipedia.org/wiki/Why_Zebras_Don%27t_Get_Ulcers
Why Zebras Don’t Get Ulcers (Wikipedia)
[L15]pubmed.ncbi.nlm.nih.gov/11571937
Habib et al. (2001) — Neuroendocrinology of stress (PubMed)
[L16]onlinelibrary.wiley.com/doi/10.1111/j.1365-2826.2008.01711.x
Lightman (2008) — Neuroendocrinology of stress (Wiley)
[L17]nature.com/articles/s41380-024-02686-3
Modern stress neuroendocrinology update (Nature)
[L18]tandfonline.com/doi/full/10.3109/10253890.2011.587726
Stress neuroendocrinology reviews (Taylor & Francis)
[L19]pubmed.ncbi.nlm.nih.gov/8379800
PubMed record: “Stress and the individual…”
[L20]sciencedirect.com/.../S0306453023002676
Advancing the allostatic load model (ScienceDirect)
[L21]stream.syscoi.com/2023/01
Systems Community of Inquiry stream (syscoi)
[L22]medialab.timesmuseum.org/.../katherine-hayles
Hayles — Detoxifying Cybernetics (MediaLab/Times Museum)
[L23]hanart.press/.../cybernetics-vol1.pdf
Cybernetics for the 21st Century Vol. 1 (PDF)
[L24]en.wikipedia.org/wiki/Autopoiesis_and_Cognition...
Wikipedia: Autopoiesis and Cognition
[L25]polyvagalinstitute.org/criticaldiscussionofpolyvagaltheory
Polyvagal Institute — critical discussion
[L26]sciencedirect.com/.../S0301051123001060
Grossman (2023) — polyvagal critique (ScienceDirect)
[L27]journalofpsychiatryreform.com/.../polyvagal-approaches...
Giroux (2023) — polyvagal approaches (Journal of Psychiatry Reform)
[L28]nature.com/articles/nrn2787
Friston (2010) — FEP review (Nature)
[L29]fil.ion.ucl.ac.uk/~karl/NRN.pdf
UCL/Filion PDF — FEP review
[L30]github.com/BerenMillidge/FEP_Active_Inference_Papers
FEP & Active Inference paper repository (GitHub)
[L31]linkedin.com/.../6671754616608223233
Lex Fridman LinkedIn post (FEP episode pointer)
[L32]gershmanlab.com/pubs/free_energy.pdf
Gershman (2019) — FEP critique (PDF)
[L33]scirp.org/reference/referencespapers?referenceid=4189904
SCIRP reference page (as supplied)
[L34]pubmed.ncbi.nlm.nih.gov/37230290
PubMed record: polyvagal critique