Does language experience shape deaf children's memory?
Deaf children who learn sign language from birth perform just as well on non-verbal memory tests as hearing children, suggesting that early language exposure, rather than hearing itself, shapes working memory development.
Source
Deaf children's non-verbal working memory is impacted by their language experience
What they did
Researchers compared three groups of children aged 6 to 11: 8 deaf native signers (exposed to British Sign Language from birth by deaf parents), 19 deaf non-native signers (who learned sign language later), and 28 hearing children. The children completed non-verbal working memory tasks (tapping block sequences forward and backward, and tracking an 'odd one out' shape) as well as standardized language and non-verbal reasoning assessments. This design allowed the authors to isolate the effects of language deprivation from the physiological effects of deafness.
What they found
The deaf children as a whole scored lower than hearing children on backward spatial memory and the 'odd one out' task, but this deficit was driven entirely by non-native signers. Deaf native signers performed at the same level as hearing children on all memory measures. Additionally, a child's vocabulary score was a significant predictor of their performance on complex working memory tasks, even when controlling for age and non-verbal intelligence.
The limits
What it doesn't show
The study had a very small sample of native signers (only 8 children), reflecting how rare this population is, which limits the statistical power of the comparisons. It also relies on a correlational design, meaning it cannot definitively prove whether language development directly causes memory improvements or if another factor, like parental attachment or social interaction, is responsible. Finally, the researchers could not fully determine whether children used silent verbal coding (inner speech or sign) to aid their performance on the visual memory tasks.
Key terms
- Working memory
- The cognitive system responsible for temporarily holding and manipulating information in our minds.
- Native signers
- Deaf individuals who are exposed to a natural sign language from birth by their deaf parents.
- Phonological loop
- A component of working memory that temporarily stores and processes speech-based or verbal information.
- Executive-loaded working memory
- Memory tasks that require both holding information in mind and actively processing or manipulating it at the same time.
- Visuo-spatial short-term memory
- The system used to temporarily store visual and spatial information, such as layouts or shapes, without processing them.
- Verbal mediation
- The strategy of using silent words or signs to help encode and remember non-verbal, visual information.
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Quiz yourself
How is working memory primarily characterized in recent cognitive psychology literature?
Common questions
Why does sign language exposure from birth matter for non-verbal memory tasks?
Early language development helps scaffold higher-level cognitive processes. It may also allow children to use internal labels (silent signing or words) to help organize and remember visual patterns more efficiently.
Does being deaf itself impair working memory?
No. The study shows that deaf children who have rich, native language access from birth perform identically to hearing children on non-verbal working memory tasks, indicating that language access, not hearing, is the crucial factor.
How did the researchers measure non-verbal memory without using spoken instructions?
They used tasks like tapping sequences on physical blocks (Spatial Span) and picking out the unique shape on a screen (Odd One Out), giving instructions in British Sign Language and requiring only pointing responses.
Why were there so few native signers in the study?
Over 90 percent of deaf children are born to hearing parents who do not know sign language. This makes deaf children of deaf parents (native signers) an exceptionally rare and difficult-to-recruit population.
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