An official website of the United States government
Abstract What is vision's role in driving early word production? To answer this, we assessed parent‐report vocabulary questionnaires administered to congenitally blind children (N = 40, Mean age = 24 months [R: 7–57 months]) and compared the size and contents of their productive vocabulary to those of a large normative sample of sighted children (N = 6574). We found that on average, blind children showed a roughly half‐year vocabulary delay relative to sighted children, amid considerable variability. However, the content of blind and sighted children's vocabulary was statistically indistinguishable in word length, part of speech, semantic category, concreteness, interactiveness, and perceptual modality. At a finer‐grained level, we also found that words’ perceptual properties intersect with children's perceptual abilities. Our findings suggest that while an absence of visual input may initially make vocabulary development more difficult, the content of the early productive vocabulary is largely resilient to differences in perceptual access. Research HighlightsInfants and toddlers born blind (with no other diagnoses) show a 7.5 month productive vocabulary delay on average, with wide variability.Across the studied age range (7–57 months), vocabulary delays widened with age.Blind and sighted children's early vocabularies contain similar distributions of word lengths, parts of speech, semantic categories, and perceptual modalities.Blind children (but not sighted children) were more likely to say visual words which could also be experienced through other senses.
more »
« less
This content will become publicly available on January 1, 2026
Comparing language input in homes of young blind and sighted children: Insights from daylong recordings
We compared everyday language input to young congenitally-blind children with no addi- tional disabilities (N=15, 6–30 mo., M:16 mo.) and demographically-matched sighted peers (N=15, 6–31 mo., M:16 mo.). By studying whether the language input of blind children differs from their sighted peers, we aimed to determine whether, in principle, the language acquisition patterns observed in blind and sighted children could be explained by aspects of the speech they hear. Children wore LENA recorders to capture the auditory language environment in their homes. Speech in these recordings was then analyzed with a mix of automated and manually-transcribed measures across various subsets and dimensions of language input. These included measures of quantity (adult words), interaction (conversational turns and child-directed speech), linguistic properties (lexical diversity and mean length of utterance), and conceptual features (talk centered around the here-and-now; talk focused on visual referents that would be inaccessible to the blind but not sighted children). Overall, we found broad similarity across groups in speech quantitative, interactive, and linguistic properties. The only exception was that blind children’s language environments contained slightly but significantly more talk about past/future/hypothetical events than sighted children’s input; both groups received equiva- lent quantities of “visual” speech input. The findings challenge the notion that blind children’s lan- guage input diverges substantially from sighted children’s; while the input is highly variable across children, it is not systematically so across groups, across nearly all measures. The findings suggest instead that blind children and sighted children alike receive input that readily supports their language development, with open questions remaining regarding how this input may be differentially leveraged by language learners in early childhood.
more »
« less
- Award ID(s):
- 2337766
- PAR ID:
- 10623957
- Publisher / Repository:
- Carnegie Mellon University Library Publishing Service
- Date Published:
- Journal Name:
- Language development research
- Volume:
- 5
- Issue:
- 3
- ISSN:
- 2771-7976
- Format(s):
- Medium: X
- Right(s):
- Creative Commons Attribution Non Commercial 4.0 International
- Sponsoring Org:
- National Science Foundation
More Like this
-
-
We investigate the roles of linguistic and sensory experience in the early-produced visual, auditory, and abstract words of congenitally-blind toddlers, deaf toddlers, and typicallysighted/ hearing peers. We also assess the role of language access by comparing early word production in children learning English or American Sign Language (ASL) from birth, versus at a delay. Using parental report data on child word production from the MacArthur-Bates Communicative Development Inventory, we found evidence that while children produced words referring to imperceptible referents before age 2, such words were less likely to be produced relative to words with perceptible referents. For instance, blind (vs. sighted) children said fewer highly visual words like “blue” or “see”; deaf signing (vs. hearing) children produced fewer auditory signs like HEAR. Additionally, in spoken English and ASL, children who received delayed language access were less likely to produce words overall. These results demonstrate and begin to quantify how linguistic and sensory access may influence which words young children produce.more » « less
-
Abstract Occipital cortices of different sighted people contain analogous maps of visual information (e.g. foveal vs. peripheral). In congenital blindness, “visual” cortices respond to nonvisual stimuli. Do visual cortices of different blind people represent common informational maps? We leverage naturalistic stimuli and inter-subject pattern similarity analysis to address this question. Blindfolded sighted (n = 22) and congenitally blind (n = 22) participants listened to 6 sound clips (5–7 min each): 3 auditory excerpts from movies; a naturalistic spoken narrative; and matched degraded auditory stimuli (Backwards Speech, scrambled sentences), during functional magnetic resonance imaging scanning. We compared the spatial activity patterns evoked by each unique 10-s segment of the different auditory excerpts across blind and sighted people. Segments of meaningful naturalistic stimuli produced distinctive activity patterns in frontotemporal networks that were shared across blind and across sighted individuals. In the blind group only, segment-specific, cross-subject patterns emerged in visual cortex, but only for meaningful naturalistic stimuli and not Backwards Speech. Spatial patterns of activity within visual cortices are sensitive to time-varying information in meaningful naturalistic auditory stimuli in a broadly similar manner across blind individuals.more » « less
-
How do life experiences impact cortical function? In people who are born blind, the “visual” cortices are recruited for nonvisual tasks such as Braille reading and sound localization (e.g., Collignon et al., 2011; Sadato et al., 1996). The mechanisms of this recruitment are not known. Do visual cortices have a latent capacity to respond to nonvisual information that is equal throughout the lifespan? Alternatively, is there a sensitive period of heightened plasticity that makes visual cortex repurposing possible during childhood? To gain insight into these questions, we leveraged naturalistic auditory stimuli to quantify and compare cross-modal responses congenitally blind (CB, n=22), adult-onset blind (vision loss >18 years-of-age, AB, n=14) and sighted (n=22) individuals. Participants listened to auditory excerpts from movies; a spoken narrative; and matched meaningless auditory stimuli (i.e., shuffled sentences, backwards speech) during fMRI scanning. These rich naturalistic stimuli made it possible to simultaneous engage a broad range of cognitive domains. We correlated the voxel-wise timecourses of different participants within each group. For all groups, all stimulus conditions induced synchrony in auditory cortex and for all groups only the narrative stimuli synchronized responses in higher-cognitive fronto-parietal and temporal regions. Inter-subject synchrony in visual cortices was high in the CB group for the movie and narrative stimuli but not for meaningless auditory controls. In contrast, visual cortex synchrony was equally low among AB and sighted blindfolded participants. Even many years of blindness in adulthood fail to enable responses to naturalistic auditory information in visual cortices of people who had sight as children. These findings suggest that cross-modal responses in visual cortex of people born blind reflect the plasticity of developing visual cortex during a sensitive period.more » « less
-
Language that uses noun labels and generic descriptions to discuss people who do science (e.g., “Let’s be scientists! Scientists discover new things”) signals to children that “scientists” is a distinctive category. This identity-focused language promotes essentialist beliefs and leads to disengagement from science among young children in experimental contexts. The extent to which these cues shape the development of children’s beliefs and behaviors in daily life, however, depends on (a) the availability of identity-focused language in children’s environments and (b) the power of these cues to shape beliefs over time, even in the noisier, more variable contexts in which children are exposed to them. Documenting the availability of this language, linguistic coding of children’s media (Study 1) and prekindergarten teachers’ language from one science lesson (Study 2; n = 103; 98 female, one male, four unknown; 66% White, 8% African American, 6% Asian/Asian American, 3% mixed/biracial; 21% of the sample, of any race, identified as Hispanic/Latinx) confirmed that identity-focused language was the most common form of science language in these two samples. Further, children (Study 3; n = 83; Mage = 4.36 years; 43 female, 40 male; 64% White, 12% Asian/Asian American, 24% mixed/biracial; 36% of the sample, of any race, identified as Hispanic/Latinx) who were exposed to lower proportions of identity-focused language from their teachers developed increasingly inclusive science beliefs and greater science engagement over time. These findings suggest that linguistic input is an important mechanism through which exclusive beliefs about science are conveyed to children in daily life.more » « less
