The spontaneous genesis of Nicaraguan Sign Language (Idioma de Señas de Nicaragua, or ISN) is widely considered by linguists to be one of the most important events in the history of cognitive science and linguistics. It provided researchers with a once-in-a-lifetime opportunity to observe the birth of a new, fully grammatical language in real-time, offering profound insights into the innate human capacity for language.
Here is a detailed explanation of how previously isolated deaf children in Nicaragua created a complete grammatical structure from scratch.
1. The Historical Context: Isolation and "Home Sign"
Prior to the late 1970s, there was no deaf community in Nicaragua. Deaf individuals lived largely in isolation, scattered throughout the country. Because they had no access to an established sign language, deaf children communicated with their hearing families using "home signs"—idiosyncratic, rudimentary systems of gestures and mimes. While useful for basic needs, home signs lack consistent grammar, complex vocabulary, and the ability to convey abstract concepts.
2. The Catalyst: The Gathering
In 1977, and expanding after the 1979 Sandinista revolution, Nicaragua established its first public special education schools in Managua. For the first time, hundreds of deaf children were brought together.
The teachers at these schools focused on "oralism"—trying to teach the children to lip-read and speak Spanish. This approach was largely unsuccessful. However, the true linguistic breakthrough occurred not in the classroom, but on the playgrounds, in the hallways, and on the school buses. As the children interacted, they began combining their individual home signs into a shared system of communication.
3. Stage One: The Pidgin (Lenguaje de Señas de Nicaragua)
The first group of children to enter the school (Cohort 1) developed an early version of the language called Lenguaje de Señas de Nicaragua (LSN).
LSN was a pidgin—a simplified communication system created when people who do not share a common language interact. It had a growing vocabulary of gestures, but it was grammatically inconsistent. It relied heavily on full-body pantomime, was largely iconic (the signs looked exactly like the actions they represented), and lacked rules for verb tense, subject-object agreement, and complex syntax.
4. Stage Two: The Genesis of Grammar (Idioma de Señas de Nicaragua)
The miracle of ISN occurred when a second generation of younger deaf children (Cohort 2) entered the school in the mid-1980s.
When these younger children—whose brains were still in the highly plastic "critical period" for language acquisition—were exposed to the older children's LSN, they did not just passively learn it. Instead, they instinctively regularized, expanded, and complexified it. They transformed the structurally inconsistent pidgin into a creole—a fully mature language with a complete grammatical structure. This new language became known as Idioma de Señas de Nicaragua (ISN).
5. How the Grammar Developed
Linguists, most notably Judy Kegl, Ann Senghas, and Marie Coppola, began studying the children in the 1980s and 1990s. They identified several ways the younger children spontaneously generated complex grammar:
- Discreteness and Combinatorial Structure: Older signers (Cohort 1) often used holistic, fluid gestures. For example, to describe a ball rolling down a hill, they would make a single, continuous rolling gesture moving downward. The younger children (Cohort 2) unconsciously broke this down into discrete units. They signed "roll" and then signed "descend." By breaking continuous actions into discrete words, they created a system where signs could be recombined in infinite ways to form complex sentences—a hallmark of true language.
- Spatial Grammar and Verb Agreement: The younger children developed a sophisticated system of using the empty space around their bodies to signify grammar. They would assign a specific location in space to a person or object. To say "he gives it to her," the signer would physically move the sign for "give" from the starting point (subject) to the ending point (object). This created a robust system of syntax and verb agreement that the older kids' pidgin lacked.
- Arbitrariness: Over time, the signs evolved from slow, full-body mimes to faster, more stylized, and arbitrary hand movements. This allowed for much faster, more efficient communication and the ability to discuss abstract concepts, past and future events, and hypotheticals.
6. The Linguistic Significance
The birth of ISN revolutionized the field of linguistics because it provided empirical evidence for two major theories:
- Universal Grammar: Proposed by Noam Chomsky, this theory suggests that the human brain contains an innate, biological blueprint for language. The children in Nicaragua were never taught grammar; they invented it. They possessed an instinct to organize communication into structured, grammatical rules, proving that language is not merely copied from adults, but is an inherent human drive.
- The Critical Period Hypothesis: The fact that the younger children (Cohort 2) created the complex grammar, while the older teenagers (Cohort 1) continued to use the clunkier pidgin, demonstrated that the human brain is uniquely primed to acquire and structure language during early childhood.
Summary
The spontaneous genesis of Nicaraguan Sign Language is a testament to human resilience and the biological imperative to communicate. By bringing isolated children together, an environment was created where the innate human language instinct could take over. Without any adult instruction, a group of young children took raw, formless gestures and forged them into a structurally perfect, infinitely expressive language within a single decade.