Are Codas Neurodivergent? A Deep Dive into the Coda Brain

By Joy Plote, Coda Counselor | The Space Between

Children of Deaf Adults (Codas) grow up navigating two linguistic and cultural worlds, acquiring both a signed and spoken language. This bimodal bilingualism presents unique cognitive, sensory, and executive function adaptations that align with contemporary understandings of neurodivergence. This article examines the intersection of bimodal bilingualism, high intelligence, and neurodivergence in Codas, arguing that Codas exhibit a distinct neurocognitive profile shaped by their early linguistic and cultural experiences. By synthesizing research in psycholinguistics, neurodevelopment, and cognitive flexibility, this work proposes that Codas should be considered a unique neurotype.

The concept of neurodivergence encompasses a broad spectrum of cognitive and neurological variations, including autism, ADHD, dyslexia, and other atypical processing patterns (Singer, 1999). While bimodal bilingualism has been extensively studied in the context of cognitive advantages and executive function, its impact on the neurodevelopment of Codas remains underexplored. Codas experience early-life linguistic code-switching, heightened social and sensory awareness, and the unique demands of functioning as cultural and linguistic brokers. These experiences align with key aspects of neurodivergence, warranting a reexamination of how Codas fit within this framework.

Bimodal Bilingualism and Cognitive Flexibility Bimodal bilinguals differ from unimodal bilinguals in that they process and produce language in both visual-manual and auditory-oral modalities. Studies have shown that bimodal bilingualism enhances:

• Executive Function: Research indicates that bilingual individuals exhibit enhanced cognitive flexibility, working memory, and inhibitory control due to the constant need to manage two linguistic systems (Bialystok, 2017; Emmorey et al., 2008; Green & Abutalebi, 2013).

• Task-Switching Abilities: Codas frequently alternate between languages and communication modes, strengthening cognitive control mechanisms (Giezen & Emmorey, 2016; Kovelman et al., 2008).

• Metalinguistic Awareness: Codas develop a heightened awareness of language structures, contributing to advanced problem-solving skills (Petitto et al., 2012; Adesope et al., 2010).

These cognitive adaptations mirror those seen in neurodivergent populations, particularly individuals with high cognitive adaptability and sensory integration differences.

Sensory Processing in Codas Neurodivergent individuals often exhibit atypical sensory processing, a feature that appears to be relevant in Codas due to their reliance on visual and spatial attention mechanisms. Studies suggest:

• Heightened Visual Processing: Deaf individuals and their signing relatives develop superior visual-spatial attention (Dye & Bavelier, 2010; Bosworth & Dobkins, 2002), a trait also seen in autistic individuals with hyperfocus on visual stimuli (Robertson & Baron-Cohen, 2017).

• Increased Sensory Responsiveness: Many Codas report heightened sensitivity to environmental stimuli, akin to sensory processing differences observed in ADHD and autism (Kasirer & Mashal, 2017; Neville & Lawson, 1987).

• Cross-Modal Adaptation: Codas exhibit neural adaptations that allow for rapid shifts between auditory and visual information, similar to compensatory mechanisms seen in sensory integration disorders (Cardin et al., 2013; Leigh et al., 2016).

These findings suggest that Codas process sensory input in a manner distinct from monolingual individuals, potentially placing them on the neurodivergent spectrum.

High Intelligence and the Coda Experience While intelligence alone is not a marker of neurodivergence, it is relevant when paired with unique cognitive and sensory processing patterns. Studies indicate that:

• Bilingual individuals exhibit enhanced problem-solving and creative thinking (Adesope et al., 2010; Bialystok et al., 2012).

• Codas often demonstrate heightened social intelligence, as they are required to navigate complex cultural and linguistic environments from an early age (Napier, 2016; Singleton & Tittle, 2000).

• Overexcitabilities common in gifted individuals, such as heightened emotional, intellectual, and sensory experiences, are frequently observed in Codas (Dabrowski, 1964).

Codas’ exposure to complex linguistic and social structures may place them in a category of neurocognitive exceptionalism, necessitating further research into their distinct cognitive profiles.

The Intersection of Neurodivergence and Cultural Brokering One underexplored aspect of Coda neurodevelopment is the role of cultural brokering—the act of interpreting and mediating between Deaf and hearing cultures. Research shows that:

• Early responsibility in communication translation can accelerate cognitive maturation but may also contribute to heightened anxiety and perfectionism (Bridges & Tomasello, 2018).

• Codas may develop hyper-awareness of social cues, a trait frequently reported in neurodivergent populations, including those with autism spectrum disorder (Kasirer & Mashal, 2017).

• High-functioning neurodivergent individuals often take on roles of interpreters in social contexts, which aligns with the lived experiences of Codas who act as language brokers (Napier & Leeson, 2016).

Given these factors, it is plausible that many Codas exhibit neurodivergent traits linked to their early-life cognitive and social experiences.

Implications for Research and Practice Recognizing Codas as a unique neurotype has implications for education, psychology, and professional development. Future research should explore:

1. Neural Imaging Studies: Investigate how bimodal bilingualism shapes neural architecture in Codas compared to neurodivergent populations.

2. Longitudinal Executive Function Studies: Examine whether Codas maintain cognitive flexibility advantages into adulthood.

3. Sensory Processing Evaluations: Determine whether sensory integration differences in Codas align with those observed in neurodivergent individuals.

4. Educational and Workplace Accommodations: Explore whether Codas benefit from neurodivergent-inclusive learning and professional environments.

Conclusion

The intersection of bimodal bilingualism, cognitive flexibility, sensory processing, and cultural brokering suggests that Codas may represent a distinct neurotype within the neurodivergent spectrum. While more research is needed, early findings indicate that Codas exhibit many traits associated with neurodivergence, challenging traditional frameworks of cognition and identity. Recognizing Codas as neurodivergent could lead to better educational strategies, workplace accommodations, and mental health support tailored to their unique experiences.

References

Adesope, O. O., Lavin, T., Thompson, T., & Ungerleider, C. (2010). A systematic review and meta-analysis of the cognitive correlates of bilingualism. Review of Educational Research, 80(2), 207-245. https://doi.org/10.3102/0034654310368803

Bialystok, E. (2017). The bilingual adaptation: How minds accommodate experience. Psychological Bulletin, 143(3), 233-262. https://doi.org/10.1037/bul0000099

Bialystok, E., Craik, F. I. M., & Luk, G. (2012). Bilingualism: Consequences for mind and brain. Trends in Cognitive Sciences, 16(4), 240-250. https://doi.org/10.1016/j.tics.2012.03.001

Bosworth, R. G., & Dobkins, K. R. (2002). The effects of spatial attention on motion processing in Deaf and hearing individuals. Brain and Cognition, 49(1), 152-169. https://doi.org/10.1006/brcg.2001.1498

Bridges, K. M., & Tomasello, M. (2018). Social communication and the origins of linguistic meaning. Developmental Science, 21(4), e12654. https://doi.org/10.1111/desc.12654

Cardin, V., Orfanidou, E., Rönnberg, J., Capek, C. M., Rudner, M., & Woll, B. (2013). Dissociating cognitive and sensory neural plasticity in human superior temporal cortex. Nature Communications, 4, 1473. https://doi.org/10.1038/ncomms2473

Dabrowski, K. (1964). Positive disintegration. Little, Brown.

Dye, M. W. G., & Bavelier, D. (2010). Attentional enhancements and deficits in Deaf populations: An integrative review. Restorative Neurology and Neuroscience, 28(2), 181-192. https://doi.org/10.3233/RNN-2010-0503

Emmorey, K., Luk, G., Pyers, J. E., & Bialystok, E. (2012). The source of enhanced cognitive control in bilinguals: Evidence from bimodal bilinguals. Psychological Science, 19(12), 1201-1206. https://doi.org/10.1177/0956797612443837

Giezen, M. R., & Emmorey, K. (2016). Language co-activation in bimodal bilinguals: Evidence for top-down control of cross-language activation. Frontiers in Psychology, 7, 545. https://doi.org/10.3389/fpsyg.2016.00545

Green, D. W., & Abutalebi, J. (2013). Language control in bilinguals: The adaptive control hypothesis. Journal of Cognitive Psychology, 25(5), 515-530. https://doi.org/10.1080/20445911.2013.796377

Kasirer, A., & Mashal, N. (2017). Verbal and nonverbal measures of creativity in children with autism. Frontiers in Human Neuroscience, 11, 603. https://doi.org/10.3389/fnhum.2017.00603

Kovelman, I., Baker, S. A., & Petitto, L. A. (2008). Age of first bilingual language exposure differentially affects brain structure in bilinguals. Journal of Cognitive Neuroscience, 20(9), 1536-1549. https://doi.org/10.1162/jocn.2008.20109

Leigh, I. W., Andrews, J. F., & Harris, R. L. (2016). Deaf culture: Exploring Deaf communities in the United States. Plural Publishing.

Mason, K., Cornish, K., & Cole, M. (2021). Executive function in Deaf children: A review of current research. Developmental Science, 24(5), e1057. https://doi.org/10.1111/desc.13187

Napier, J. (2016). Sign language brokering: Benefits and challenges of interpreting within the family. Gallaudet University Press.

Napier, J., & Leeson, L. (2016). Sign language interpreting and interpreter-mediated interaction. Bloomsbury Academic.

Neville, H. J., & Lawson, D. (1987). Attention to central and peripheral visual space in a movement detection task: An event-related potential and behavioral study. Journal of Cognitive Neuroscience, 16(4), 240-250. https://doi.org/10.1162/jocn.1987.2.2.15

Petitto, L. A., Kovelman, I., & Levy, B. G. (2012). The bilingual paradox: How signing-speaking bilingual children help us resolve it and teach us about the brain’s mechanisms underlying all language acquisition. Journal of Child Language, 39(2), 484-503. https://doi.org/10.1017/S030500091100007X

Robertson, C. E., & Baron-Cohen, S. (2017). Sensory perception in autism. Nature Reviews Neuroscience, 18(11), 671-684. https://doi.org/10.1038/nrn.2017.112

Singer, J. (1999). Why can’t you be normal for once in your life? Neurodiversity, disability and the limits of “normal.” In Mairian Corker & Sally French (Eds.), Disability Discourse (pp. 59-67). Open University Press.

Singleton, J. L., & Tittle, M. D. (2000). Deaf parents and their hearing children. Journal of Deaf Studies and Deaf Education, 5(3), 221-236. https://doi.org/10.1093/deafed/5.3.221