The story of Nicaraguan Sign Language (Idioma de Señas de Nicaragua, or ISN) is one of the most remarkable and important events in the history of modern linguistics. It represents the only time in recorded history that scientists have been able to observe the spontaneous birth and evolution of a completely new language from its very inception.
Here is a detailed explanation of the spontaneous emergence and unique grammatical evolution of ISN.
1. The Context: Isolation and "Home Sign"
Prior to the late 1970s, there was no Deaf community in Nicaragua. Deaf children were largely kept isolated in their homes due to social stigma. Because they had no contact with other deaf individuals and could not hear spoken Spanish, they did not acquire a formal language.
To communicate basic needs with their hearing families, these children developed idiosyncratic, highly localized gestures known as "home signs" (mímicas). However, home signs are not a true language; they lack grammatical structure, consist mostly of simple pantomime, and vary completely from one household to the next.
2. The Spontaneous Emergence (The Genesis)
The catalyst for the birth of ISN was a major shift in public education. In 1977, an initial center for special education was established in Managua, which was vastly expanded in 1979 following the Sandinista revolution. For the first time, hundreds of deaf children from across the country were brought together into a single school.
The Failure of Oralism The educators at the school attempted to teach the children using an "oralist" approach—forcing them to try to lip-read and speak Spanish, and to trace Spanish letters in the air. This approach was an abject failure. The children had no concept of Spanish, nor did they understand that the shapes their mouths were making corresponded to sounds.
The Playground Rebellion While the teachers were failing to teach Spanish in the classroom, something extraordinary was happening on the school buses and the playground. The children, desperate to communicate with one another, began pooling their individual home signs.
Through daily interaction, they spontaneously forged a shared, rudimentary communication system. This first stage of the language is referred to by linguists as Lenguaje de Señas Nicaragüense (LSN). It was highly functional but structurally simple—essentially a "pidgin" language. It relied heavily on full-body pantomime, lacked a consistent grammar, and was spoken primarily by the older teens who made up the first cohort of students.
3. The Unique Grammatical Evolution
The true linguistic miracle occurred when younger deaf children—the second and third cohorts—entered the school in the 1980s and 1990s.
When these younger children (around ages 4 to 7) were exposed to the older students' LSN, their brains instinctively did what young human brains are hardwired to do: they sought out patterns, rules, and structure. The younger children took the clumsy, pantomime-heavy pidgin of the older kids and rapidly transformed it into a complex, fully grammatically structured language: Idioma de Señas de Nicaragua (ISN).
This evolution provided linguists (most notably Dr. Judy Kegl, who was brought in by the Nicaraguan Ministry of Education in 1986 to study the phenomenon) with direct evidence of how grammar evolves. Key evolutionary milestones included:
- Spatial Grammar and Verb Agreement: The younger kids began using the physical space in front of them to establish grammar. If they signed "boy" on their left and "girl" on their right, they could indicate who was giving a book to whom simply by the directional movement of the "give" sign. This replaced the need for clunky, multi-step pantomimes used by the first cohort.
- Speed and Fluidity: The signs became smaller, faster, and more abstract. They moved from full-body gestures to precise movements of the hands and face, typical of mature sign languages.
- Segmentation and Discreteness (The "Rolling" Example): This is the most famous discovery regarding ISN. Linguists showed the children a cartoon of a cat rolling down a hill.
- The older cohort (the creators of the pidgin) described the action just as hearing people do when gesturing: with a single, continuous, sweeping motion of the hand swooping downward in circles.
- The younger cohort (the creators of the true language), however, broke the action apart. They signed "ROLL" (a circular hand motion in place), followed by "DOWN" (a straight hand motion downward).
- Significance: This separation is the hallmark of true syntax. The younger children had spontaneously invented discrete linguistic units (words/signs) that could be rearranged and combined to form infinite new sentences.
4. Scientific Significance
The emergence of Nicaraguan Sign Language sent shockwaves through the fields of cognitive science, psychology, and linguistics. It provided crucial evidence for several major theories:
- The Innateness of Language: It strongly supports Noam Chomsky's theory of "Universal Grammar"—the idea that the human brain possesses an innate, biological blueprint for language. The children in Nicaragua didn't learn their grammar from adults; their brains supplied it instinctively.
- The Critical Period Hypothesis: ISN proved that there is a strict biological window for language acquisition. The older children (who created the initial pidgin) were never able to fully master the complex grammar of ISN, even after using it for decades. Only the very young children possessed the cognitive plasticity required to build the language's grammatical foundation.
- Language is a Community Creation: It demonstrated that a language cannot be created by an isolated individual. It requires a community—specifically, a community of interacting children—to be born.
Conclusion
Nicaraguan Sign Language was not invented by linguists, teachers, or adults. It was entirely the creation of deaf children who, armed with nothing but their innate human drive to connect, built a rich, complex, and beautiful language out of thin air in less than two decades. Today, ISN is recognized as a full, vibrant language and serves as the cultural bedrock of the Nicaraguan Deaf community.