Deaf Children in Managua Invented a Complete Language

Languages take centuries to form, long before anyone writes them down. Where a language got its first grammar can therefore almost always only be reconstructed. Nicaragua is the exception. There, a language came into being while people who could describe it were watching.

Until the 1970s the country had no public school for deaf children. Growing up deaf usually meant staying inside one's own family and communicating through gestures invented at home. Such home signs work reliably, but only in the closest circle: mother, siblings, the children next door. Outside the house nobody understood them, and there was nobody to share them with either.

Then a special school opened in Managua. For the first time hundreds of deaf children met each other, each arriving with a personal stock of signs.

What the lessons failed to do, the breaks did

Teaching aimed at lip-reading and spoken Spanish. It worked only to a limited degree. What mattered happened alongside it: in the yard, on the buses, on the way home. There the children did not need Spanish, they needed something everyone in the yard could follow.

They began to align their home signs with one another. A child who brought a sign of their own either made it stick or adopted somebody else's. What emerged first was a simple, inconsistent system, enough to get by, but without fixed rules. Two children could say the same thing in two ways, and both passed.

The lessons aimed at lip-reading. The language emerged during the break.

— TerraTally · Languages desk

The second step was the remarkable one. Younger children who grew up inside that system did not simply take it over, they regularised it. They introduced consistency where the older ones had improvised. They broke compound gestures into smaller building blocks and recombined them. They built grammatical structures that nobody had taught them. A makeshift means of understanding turned into a language with its own vocabulary, its own grammar and its own syntax.

In 1986 the Nicaraguan education ministry invited a US linguist to work out what the children were actually doing. The answer was not the expected one. They were not speaking bad Spanish. They were speaking something fluently that had not existed before, and the adults in the room were the ones who did not command it.

That all of this happened in the 1980s helped the research. Video cameras were available and affordable. Researchers could record how individual children in individual year groups signed, and later lay recordings of different age cohorts side by side. That made visible what usually stays in the dark: with every group that followed, the language became more regular and more complex.

The case shifted a debate that until then could only be held in theory, the question of whether language is essentially learned or whether the capacity for it is brought along. In Managua nobody taught the children a language. It was enough that enough children came together who had something to tell each other.

The direction is what remains most striking. The adults did not pass the language down to the children. The children built it, and the youngest among them finished it. It is handed on today by the people who invented it.