Overview
Whether language is an innate human capacity or purely a cultural invention — and what happens when children are raised without it. The evidence points toward a biological predisposition to build communication systems, with specific language being culturally learned on top of an inborn drive to communicate.
Key Concepts
- The core question: if children grew up with zero exposure to any existing language, would they spontaneously create one? The answer, across multiple lines of evidence, appears to be yes.
- Language is not purely cultural — isolated and feral children consistently develop gesture, vocalisation, or proto-language even without linguistic input. The specific language is cultural; the drive to create one is innate.
- Critical periods — the brain’s capacity to acquire language fully is time-limited; early deprivation has lasting effects, but the impulse to communicate appears even in severely deprived cases.
- Each generation adds complexity — new language isn’t static from birth; it elaborates over generational time as children refine what they inherit.
Historical Evidence
Psamtik I (664–610 BCE) — Herodotus describes the Egyptian pharaoh isolating two infants to discover the “oldest language”. Children reportedly said “becos” (Phrygian for bread), taken as proof Phrygians predated Egyptians. Almost certainly apocryphal, but the fact this experiment was recorded shows the question has fascinated humans for millennia.
Feral children — multiple documented cases (Victor of Aveyron, Genie, Kaspar Hauser) show communication attempts emerge even without language input, though full grammatical language typically does not develop after the critical period.
Nicaraguan Sign Language — The Strongest Evidence
The clearest real-world test case. In the 1970s–80s, deaf children in Nicaragua were brought together in schools for the first time. They had no shared language. Within years, they spontaneously created a new, fully functional sign language — NSL (Nicaraguan Sign Language).
Crucially: each successive generation of children added grammatical complexity the previous generation hadn’t had. The language elaborated naturally rather than being taught. This is unprecedented — a documented case of language creation from scratch, in real time, in living memory.
NSL is now studied by linguists as the closest thing to watching language emerge from nothing.
Synthesis
Language is a two-layer phenomenon:
- Biological layer — the drive and capacity to build a communication system is innate; it emerges without instruction
- Cultural layer — the specific sounds, grammar, and vocabulary of any language are learned from the environment
This has direct implications for language learning: the barrier to acquiring a new language isn’t a lack of linguistic capacity — the brain already has that. The barrier is the interference patterns from L1 (your first language), which occupy the same cognitive channels. This reframes the learning task: not installing something new, but redirecting existing circuitry.
Contradictions / Open Questions
- Feral child cases are confounded by trauma, developmental neglect, and post-rescue conditions — hard to isolate language deprivation as the sole variable
- NSL shows language emerges rapidly in groups; isolated individuals show much weaker proto-language — does the social dimension make language creation inevitable in a way that individual isolation cannot?
- Where is the line between “proto-language” (gesture + vocalisation) and full grammatical language? The cases are clear at extremes but fuzzy in the middle