The Evolutionary Schedule of Infant Dependency in Early Hominins

And Why Inuit and San Lifeways Preserve Co‑Survival

This section outlines the developmental timeline of early hominin infants, the ecological conditions that shaped human pair‑bonding, and why groups like the Inuit and San retained mutualistic co‑survival rather than coercive provisioning systems.

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1. Why Inuit and San Preserve the Ancestral Pattern

Both Inuit and San societies maintain ecological conditions that block the emergence of coercive, surplus‑based dependency:

• No hoardable surplus (meat freezes but is shared; foraged foods are immediate-return).
• High mobility, preventing territorial monopolization.
• Cooperative hunting/foraging, requiring multi‑adult collaboration.
• Infants in constant contact, requiring alloparenting.
• No guardable hearth surplus, preventing hostage‑pledge dynamics.

These conditions preserve the ancestral human relational field:
co‑survival, mutualism, and flexible pair bonds.

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2. The Two Variables That Determine Human Relational Architecture

Human relational systems pivot on two evolutionary facts:

A. Food ecology

• If food is immediate-return → no one can monopolize it → mutualism.
• If food is storable, guardable, or stealable → coercion becomes possible.

B. Infant dependency length

Human infants are:

• born early (secondary altriciality),
• immobile,
• unable to cling,
• dependent for years.

This creates a long vulnerability window that can be filled by:

• cooperative care (mutualism), or
• enforced provisioning (hostage‑pledge).

The ecology determines which one emerges.

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3. Developmental Schedule of Infant Dependency in Early Hominins

Australopithecus (4–2 mya)

• Brain size: ~450 cc
• Likely infant dependency: 1–2 years of high dependency
• Infants could cling (chimp‑like grasp reflex).
• Pair bonds: fluid, cooperative, non‑coercive.

Homo erectus (1.9 mya – 150 kya)

• Brain size: ~900 cc
• Major shift: secondary altriciality (born earlier, more helpless).
• Dependency: 2–3+ years of intense care.
• Cooperative breeding emerges.
• Still no evidence of resource‑based coercion.

Archaic Homo sapiens (600–200 kya)

• Brain size: ~1200 cc
• Dependency: 3–4 years of high dependency, plus long childhood.
• Cooperative care essential.
• Still immediate-return ecology → no coercive provisioning.

Anatomically Modern Humans + Cooking (post‑Wrangham shift)

• Infant dependency unchanged.
• But cooking introduces:
• storable surplus
• guardable hearths
• predictable schedules
• resource monopolization

This is the first moment where dependency can be weaponized.

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4. The Wrangham Inversion

Cooking did not create pair bonds.
It inverted the relational logic.

Before cooking

• infants dependent
• food not monopolizable
• pair bonds mutualistic
• no hostage‑pledge architecture possible

After cooking

• infants still dependent
• food becomes monopolizable
• provisioning becomes leverage
• coercive pair bonds become ecologically viable

This is the hinge where humans diverge from other mammals:
pair bonding + hostage‑pledge can coexist in the same dyad.

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5. Why Inuit and San Never Inverted

Because their ecologies block the coercive architecture:

• no hoardable surplus
• no fixed hearth that can be guarded
• mobility prevents territorial control
• cooperative care is required for survival
• infants remain in constant contact
• provisioning is shared, not monopolized

They preserve the ancestral co‑survival field.

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6. Clean Synthesis

Yes — early hominins had long infant dependency schedules. But this only becomes coercive when paired with storable food.

Inuit and San show what humans look like when:

• infant dependency is high
• but food cannot be monopolized

This is why they remain in co‑survival mutualism rather than coercive provisioning systems.

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