Self-taught Homesigning Deaf Children Supports Universal Language Constraints
Synopsis: Deaf homesigners offer a unique window into whether there are universals for how people use language to talk about ideas. The work of many psychological scientists suggests that the thousands of languages spoken worldwide draw on many of the same fundamental linguistic abilities and reflect universal aspects of how humans categorize events. The researchers compared how young homesigners - deaf children without access to an established sign language - and English, Spanish, and Chinese-speaking adults describe using tools such as paintbrushes and knives.
A homesigner is a deaf person who has not properly acquired a signed or spoken language due to lack of instruction and isolation from an established signing community, which instead uses a self-generated gesture system called a home sign - a gestural communication system, less than a complete sign language, developed by a deaf child who lacks input from a language model in the family. Because home sign systems are used regularly for the child's communication, so they become more complex than simple gestures. Though not considered a complete language, these systems may be classified as linguistic phenomena similar to signed and spoken language. Linguists have been interested in home sign systems as insight into the human ability to generate, acquire, and process language.
In 1987, Nancy Frishberg set a framework for identifying and describing home-based sign systems. She states that home signs differ from sign languages in that they:
- Are not shared by one large group.
- Do not pass on from generation to generation.
- Do not have a consistent meaning-symbol relationship.
- Are not considered the same over a community of signers.
Universal Constraints on Linguistic Event Categories: A Cross-Cultural Study of Child Homesign - Psychological Science
Deaf homesigners offer a unique window into whether there are universals for how people use language to talk about ideas. The self-taught vocabulary of homesigning deaf children supports universal constraints on language.
Languages may seem different on an instinctual level - "hello," for example, does not sound like "ni hao." But the work of many psychological scientists suggests that the thousands of languages spoken throughout the world draw on many of the same fundamental linguistic abilities and reflect universal aspects of how humans categorize events. Some aspects of language may also be universal to people who create their own sign languages, according to new research in Psychological Science. The researchers compared how young homesigners - deaf children without access to an established sign language - and English, Spanish, and Chinese-speaking adults describe the use of tools such as paintbrushes and knives.
"We found broad similarities across these groups, indicating ways of thinking about the world - and describing the world through language - that are common to all people," wrote researchers Lilia Rissman, Laura Horton (University of Wisconsin-Madison), and APS William James Award recipient Susan Goldin-Meadow (The University of Chicago). "These results help us understand which aspects of our thinking and communication are a product of being human rather than a product of our particular cultures and experiences."
Most children learn to speak their first language through immersion in the linguistic culture around them, but this is not the case for deaf children without access to an established sign language.
"Deaf homesigners give us a unique window into this question of 'are there universals for how people use language to talk about ideas,'" said Rissman in an interview. That's "because homesigners are creating language from the ground up through their gestures; they aren't learning an established linguistic system from a community."
Rissman and colleagues dug deeper into the universal constraints on language by comparing the tool-related language use of 43 hearing adult speakers of Chinese, Spanish, and English and 10 deaf homesigners ages 3 to 11 from Guatemala, Nicaragua, the United States, Taiwan, and Turkey.
Because there are relatively few children with these unique circumstances, it took Rissman and colleagues several decades to collect data from the homesigning children. Each child was filmed during one to four sessions while looking at a picture book with a researcher, family member, or friend and being asked to describe what was happening in different scenes using their own version of homesign. The illustrations included images of tool events, such as a pig painting and a rabbit cutting fruit, as well as stand-alone images of tools like paintbrushes and knives that were not being used.
Upon reviewing the footage, the researchers coded the homesign for each tool-related action or object according to whether it was an instrumental sign that reflected the shape of the tool, a handling sign that reflected the shape of the hand holding the tool, or an ambiguous sign.
A group of 24 online participants were also tasked with judging how well, on a scale of 1 to 5, the instrumental signs most commonly used by the deaf children to describe each event reflected the shape of the tool being used. For events that the children described with handling signs, the participants were asked to rate instrumental signs from various global sign languages.
The English, Spanish, and Chinese-speaking adults completed a similar task online in which they were asked to describe what was happening in the tool-event images and, for the images of stand-alone tools, to indicate the action most commonly associated with each tool. A separate set of online reviewers fluent in each language judged the verbs the participants used in their descriptions to determine if the verbs used highlighted the tool or the action in question. For example, 97% of English-speaking online respondents perceived "cut" as tool-oriented because of its close association with tools like scissors and knives. But just 3% of online reviewers had this perception of the more general verb "make," which any number of tools (or none at all) can do.
Overall, Rissman and colleagues found that when online reviewers perceived the verbs that English, Spanish, and Chinese-speaking participants used to describe an event as more tool-oriented, the homesigning children were also likelier to use instrumental signs to describe the same actions.
"This correspondence suggests universal constraints on the interface between conceptual event knowledge and language because we observed this common pattern across children and adults, across different cultures, and across individuals who had learned a conventional language from birth and individuals who had not," the researchers wrote.
On the other hand, when describing stand-alone images of tools, hearing participants' use of tool-oriented verbs did not predict deaf children's use of instrumental signs. This suggests that these findings are specific to universal constraints on how humans describe tool-use events, not tools in general, Rissman and colleagues wrote.
Similarities in how people describe tool-use events may reflect the extent to which a tool is perceived to "mold" the object it is being used on, such as when a shovel leaves a similarly shaped indent in the ground, the researchers suggested.
In future work, Rissman would like to explore the extent to which universal constraints on how people describe tool use may influence the perception and recall of those events.
This peer reviewed publication pertaining to our Deaf Communication section was selected for circulation by the editors of Disabled World due to its likely interest to our disability community readers. Though the content may have been edited for style, clarity, or length, the article "Self-taught Homesigning Deaf Children Supports Universal Language Constraints" was originally written by Association for Psychological Science, and submitted for publishing on 2023/03/03 (Edit Update: 2023/10/03). Should you require further information or clarification, Association for Psychological Science can be contacted at the psychologicalscience.org website. Disabled World makes no warranties or representations in connection therewith.
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