{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:36:46Z","timestamp":1787027806117,"version":"build-2736575974"},"reference-count":57,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2024,8,31]],"date-time":"2024-08-31T00:00:00Z","timestamp":1725062400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Brain Sciences"],"abstract":"<jats:p>During the period in which children learn to read and write, a gradual shift from right to left hemisphere dominance for language is typically seen. However, in children with dyslexia, a deviant pattern is described in the literature. As part of a larger longitudinal study (The Bergen Longitudinal Dyslexia Study), the present study aimed to assess this development from an early age before children learn to read and write. Dichotic listening (DL), which is a non-invasive test, was used to assess the development of brain laterality in a Typical group and a Dyslexia group. The participants received yearly sessions of evidence-based literacy training at ages 5 to 7. The Typical group showed increasing ear scores and a shift from no ear advantage in the Pre-literacy stage (age 6), indicative of no hemisphere dominance, to a right ear advantage, indicative of a left hemisphere dominance, in the Emergent literacy stage (age 8) and the Literacy stage (age 11). The Dyslexia group showed a different pattern, with a significant right ear advantage at age 6, indicative of a right hemisphere dominance, and increasing ear scores at ages 8 and 11; however, no ear dominance was observed in the Literacy stage. The results point to an effect of relevant, evidence-based training affecting both right and left hemispheres in dyslexia, which should form a basis for further research.<\/jats:p>","DOI":"10.3390\/brainsci14090893","type":"journal-article","created":{"date-parts":[[2024,9,3]],"date-time":"2024-09-03T09:56:42Z","timestamp":1725357402000},"page":"893","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Brain Laterality in Dyslexia Seen during Literacy Development and Early Training"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4535-1870","authenticated-orcid":false,"given":"Turid","family":"Helland","sequence":"first","affiliation":[{"name":"Department of Biological and Medical Psychology, University of Bergen, 5020 Bergen, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1007\/BF02648022","article-title":"A Developmental framework for developmental dyslexia","volume":"36","author":"Frith","year":"1986","journal-title":"Ann. Dyslexia"},{"key":"ref_2","first-page":"5","article-title":"Learning to Read and Spell Words","volume":"19","author":"Ehri","year":"1987","journal-title":"J. Lit. Res."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1038\/scientificamerican0373-70","article-title":"The asymmetry of the human brain","volume":"228","author":"Kimura","year":"1973","journal-title":"Sci. Am."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1016\/S0010-9452(67)80010-8","article-title":"Functional asymmetry of the brain in dichotic listening","volume":"3","author":"Kimura","year":"1967","journal-title":"Cortex"},{"key":"ref_5","unstructured":"Squire, L.R. (2009). Dichotic Listening Studies of Brain Asymmetry. Encyclopedia of Neuroscience, Academic Press."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Pegado, F., Nakamura, K., and Hannagan, T. (2014). How does literacy break mirror invariance in the visual system?. Front. Psychol., 5.","DOI":"10.3389\/fpsyg.2014.00703"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"234","DOI":"10.1038\/nrn3924","article-title":"Illiterate to literate: Behavioural and cerebral changes induced by reading acquisition","volume":"16","author":"Dehaene","year":"2015","journal-title":"Nat. Rev. Neurosci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"983","DOI":"10.1038\/nature08461","article-title":"An anatomical signature for literacy","volume":"461","author":"Carreiras","year":"2009","journal-title":"Nature"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"283","DOI":"10.1146\/annurev-clinpsy-032814-112842","article-title":"Developmental Dyslexia","volume":"11","author":"Peterson","year":"2015","journal-title":"Annu. Rev. Clin. Psychol."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Helland, T. (2022). Trends in Dyslexia Research during the Period 1950 to 2020\u2014Theories, Definitions, and Publications. Brain Sci., 12.","DOI":"10.3390\/brainsci12101323"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Catts, H., Terry, N.P., Lonigan, C.J., Compton, D.L., Wagner, R.K., Steacy, L.M., Farquharson, K., and Petscher, Y. (Ann. Dyslexia, 2024). Revisiting the definition of dyslexia, Ann. Dyslexia, ahead of print.","DOI":"10.1007\/s11881-023-00295-3"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Stein, J. (2023). Theories about Developmental Dyslexia. Brain Sci., 13.","DOI":"10.3390\/brainsci13020208"},{"key":"ref_13","unstructured":"BDA (2008, December 08). British Dyslexia Association: Definition of Dyslexia. Available online: https:\/\/www.bdadyslexia.org.uk\/dyslexia\/about-dyslexia\/what-is-dyslexia."},{"key":"ref_14","first-page":"357","article-title":"Causal modeling: A structural approach to developmental psychopathology","volume":"Volume 1","author":"Cohen","year":"1995","journal-title":"Developmental psychopathology"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"899","DOI":"10.1037\/h0047762","article-title":"Speech lateralization in young children as determined by an auditory test","volume":"56","author":"Kimura","year":"1963","journal-title":"J. Comp. Physiol. Psychol."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Westerhausen, R., and Samuelsen, F. (2020). An optimal dichotic-listening paradigm for the assessment of hemispheric dominance for speech processing. PLoS ONE, 15.","DOI":"10.31234\/osf.io\/tpjes"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"806","DOI":"10.1037\/dev0000014","article-title":"Cognitive Control of Speech Perception Across the Lifespan: A Large-Scale Cross-Sectional Dichotic Listening Study","volume":"51","author":"Westerhausen","year":"2015","journal-title":"Dev. Psychol."},{"key":"ref_18","first-page":"251","article-title":"Language comprehension predicts dichotic listening performance. Laterality","volume":"11","author":"Helland","year":"2006","journal-title":"Asymmetries Body Brain Cogn."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Reynard, P., Joly, C.-A., Damien, M., Le Normand, M.-T., Veuillet, E., and Thai-Van, H. (2023). Age-Related Dichotic Listening Skills in Impaired and Non-Impaired Readers: A Comparative Study. J. Clin. Med., 12.","DOI":"10.3390\/jcm12020666"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1910","DOI":"10.1016\/j.cortex.2012.08.002","article-title":"Sex differences in language asymmetry are age-dependent and small: A large-scale, consonant\u2013vowel dichotic listening study with behavioral and fMRI data","volume":"49","author":"Hirnstein","year":"2013","journal-title":"Cortex"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"tgad009","DOI":"10.1093\/texcom\/tgad009","article-title":"Analysis of distributions reveals real differences on dichotic listening scores between left- and right-handers","volume":"4","author":"Karlsson","year":"2023","journal-title":"Cereb. Cortex Commun."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"211","DOI":"10.1016\/j.bandc.2011.03.006","article-title":"Fifty years of dichotic listening research\u2014Still going and going and\u2026","volume":"76","author":"Hugdahl","year":"2011","journal-title":"Brain Cogn."},{"key":"ref_23","first-page":"289","article-title":"Brain asymmetry for language in dyslexic children. Laterality: Asymmetries of Body","volume":"6","author":"Helland","year":"2001","journal-title":"Brain Cogn."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1002\/dys.343","article-title":"Dichotic listening and school performance in dyslexia","volume":"14","author":"Helland","year":"2008","journal-title":"Dyslexia"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"336","DOI":"10.1002\/dys.1600","article-title":"Auditive training effects from a dichotic listening app in children with dyslexia","volume":"24","author":"Helland","year":"2018","journal-title":"Dyslexia"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1002\/dys.1736","article-title":"Improving non-native duration contrast with dichotic training in dyslexic and non-dyslexic individuals","volume":"29","author":"Bouhon","year":"2023","journal-title":"Dyslexia"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1002\/dys.432","article-title":"Predicting Dyslexia at Age 11 from a Risk Index Questionnaire at Age 5","volume":"17","author":"Helland","year":"2011","journal-title":"Dyslexia"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"3136","DOI":"10.1093\/brain\/awu229","article-title":"Neuroanatomical precursors of dyslexia identified from pre-reading through to age 11","volume":"137","author":"Clark","year":"2014","journal-title":"Brain"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"92","DOI":"10.1016\/j.neuroimage.2016.09.060","article-title":"Reading in dyslexia across literacy development: A longitudinal study of effective connectivity","volume":"144","author":"Morken","year":"2017","journal-title":"NeuroImage"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1111\/j.1467-9450.2008.00688.x","article-title":"Brain activation reveals at-risk for dyslexia in 6-year old children","volume":"50","author":"Specht","year":"2009","journal-title":"Scand. J. Psychol."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Morken, F., Helland, T., Hugdahl, K., and Specht, K. (2014). Children with dyslexia show cortical hyperactivation in response to increasing literacy processing demands. Front. Psychol., 5.","DOI":"10.3389\/fpsyg.2014.01491"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1177\/0022219410391188","article-title":"Effects of Bottom-Up and Top-Down Intervention Principles in Emergent Literacy in Children at Risk of Developmental Dyslexia: A Longitudinal Study","volume":"44","author":"Helland","year":"2011","journal-title":"J. Learn. Disabil."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1002\/dys.1515","article-title":"Neurocognitive Development and Predictors of L1 and L2 Literacy Skills in Dyslexia: A Longitudinal Study of Children 5\u201311\u2009Years Old","volume":"22","author":"Helland","year":"2016","journal-title":"Dyslexia"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1002\/dys.1455","article-title":"Writing in Dyslexia: Product and Process","volume":"19","author":"Morken","year":"2013","journal-title":"Dyslexia"},{"key":"ref_35","unstructured":"Norwegian Directorate for Education and Training (2022). The Education System in Norway. From Early Childhood to Young Adults, Information for newly arrived parents and guardians."},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Robila, M., and Taylor, A.C. (2018). Family and Child Welfare in Norway: An Analysis of the Welfare State\u2019s Programs and Services. Global Perspectives on Family Life Education, Springer International Publishing.","DOI":"10.1007\/978-3-319-77589-0"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1046\/j.1365-2214.2000.00173.x","article-title":"Evidence-based approach to developmental and behavioural surveillance using parents\u2019 concerns","volume":"26","author":"Glascoe","year":"2000","journal-title":"Child Care Health Dev."},{"key":"ref_38","unstructured":"Helland, T. (2015). RI-5. Dyslexia Risk Index, InfoVest. A Questionnaire for Parents and Pre-School Teachers."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1002\/dys.1698","article-title":"Kindergarten screening tools filled out by parents and teachers targeting dyslexia. Predictions and developmental trajectories from age 5 to age 15 years","volume":"27","author":"Helland","year":"2021","journal-title":"Dyslexia"},{"key":"ref_40","unstructured":"APA, and DSM-IV (1994). Diagnostic and Statistical Manual of Mental Disorders, American Psychiatric Association."},{"key":"ref_41","unstructured":"Bishop, D.V.M. (2003). The Children\u2019s Communication Checklist, The Psychological Corporation. [2nd ed.]. CCC-2."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"287","DOI":"10.1111\/j.1467-9450.2009.00718.x","article-title":"The usability of a Norwegian adaptation of the Children's Communication Checklist Second Edition (CCC-2) in differentiating between language impaired and non-language impaired 6- to 12-year-olds","volume":"50","author":"Helland","year":"2009","journal-title":"Scandinavian J. Psychol."},{"key":"ref_43","unstructured":"Hugdahl, K. (1988). Handbook of Dichotic Listening: Theory, Methods and Research, John Wiley & Sons."},{"key":"ref_44","doi-asserted-by":"crossref","unstructured":"Hugdahl, K., and Davidson, R.J. (2003). Dichotic Listening in the Study of Auditory Laterality. The Asymmetric Brain, The MIT Press.","DOI":"10.7551\/mitpress\/1463.003.0017"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1186\/s43163-023-00552-7","article-title":"Test-retest reliability of dichotic listening test in younger adults with normal hearing","volume":"39","author":"Ramachandran","year":"2023","journal-title":"Egypt. J. Otolaryngol."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"434","DOI":"10.1080\/1357650X.2014.997245","article-title":"Laterality across languages: Results from a global dichotic listening study using a smartphone application","volume":"20","author":"Bless","year":"2015","journal-title":"Laterality Asymmetries Body Brain Cogn."},{"key":"ref_47","unstructured":"Hugdahl, K., and Asbj\u00f8rnsen, A.E. (1994). Dikotisk lyssning Med CV-Stavelser: Manual, Psykologif\u00f6rl."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"1230531","DOI":"10.1126\/science.1230531","article-title":"Cerebral Asymmetry and Language Development: Cause, Correlate, or Consequence?","volume":"340","author":"Bishop","year":"2013","journal-title":"Science"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"713","DOI":"10.1016\/j.neuron.2010.08.038","article-title":"Brain mechanisms in early language acquisition","volume":"67","author":"Kuhl","year":"2010","journal-title":"Neuron"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"511","DOI":"10.1146\/annurev.neuro.30.051606.094321","article-title":"Neural Substrates of Language Acquisition","volume":"31","author":"Kuhl","year":"2008","journal-title":"Annu. Rev. Neurosci."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"306","DOI":"10.1080\/1357650X.2014.963597","article-title":"Language lateralization shifts with learning by adults","volume":"20","author":"Plante","year":"2015","journal-title":"Laterality Asymmetries Body Brain Cogn."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/0093-934X(84)90079-8","article-title":"Dichotic listening ear asymmetry: Patterns of longitudinal development","volume":"22","author":"Morris","year":"1984","journal-title":"Brain Lang."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1162\/nol_a_00136","article-title":"Approaches to Measuring Language Lateralisation: An Exploratory Study Comparing Two fMRI Methods and Functional Transcranial Doppler Ultrasound","volume":"5","author":"Bishop","year":"2024","journal-title":"Neurobiol. Lang."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"672","DOI":"10.1111\/jcpp.13140","article-title":"Dyslexia and Developmental Language Disorder: Comorbid disorders with distinct effects on reading comprehension","volume":"61","author":"Snowling","year":"2020","journal-title":"J. Child Psychol. Psychiatry"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"e548","DOI":"10.1111\/cdev.13216","article-title":"Developmental outcomes for children at high risk of dyslexia and children with developmental language disorder","volume":"90","author":"Snowling","year":"2019","journal-title":"Child Development"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"283","DOI":"10.1146\/annurev.psych.60.110707.163548","article-title":"Relations Among Speech, Language, and Reading Disorders","volume":"60","author":"Pennington","year":"2009","journal-title":"Ann. Rev. Psychol."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"1012","DOI":"10.1093\/cercor\/bhq165","article-title":"Structural and Functional Reorganization of the Corpus Callosum between the Age of 6 and 8 Years","volume":"21","author":"Westerhausen","year":"2011","journal-title":"Cereb. 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