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People who write with one hand are ‘more likely’ to have dyslexia or schizophrenia

News RoomBy News RoomMay 11, 2025
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Handedness and Dyslexia: A Link That Summons Symmetry in Learning Challenges

Dyslexia is a common learning difficulty characterized by difficulties understanding and processing written text. According to the NHS, it is classified as a ‘specific learning disability,’ meaning it affects an individual’s ability to process visual information, not their intelligence. As a lifelong issue, dyslexia becomes apparent during early education, manifesting as challenges with reading, spelling, and writing.

Recent large-scale genetic and GWAS studies reveal a significant association between left-handedness and dyslexia. These studies indicate that individuals with a higher prevalence of left-handedness are more likely to experience dyslexia, possibly due to the development of leftward brain Hollow as dictated by the asymmetrical orientation of written text. Similarly, individuals who are mixed-handed may experience both a higher prevalence of dyslexia and related disorders like autism. These findings underscore the potential influence of handedness on various cognitive and social deficits.

Prevalence statistics show that over 50% of the population consumes one hand, as opposed to 10% using both hands. Among these, left-handedness correlates with a higher incidence of dyslexia, with 15-20% of left-handed individuals exhibiting the condition. Despite the prevalence of other learning disabilities, such as autism, the study does not establish a direct genetic link. Instead, it suggests that both hand tenacity and genetic factors may contribute to the development of asymmetrical brain structure and dyslexia risk.

Beyond dyslexia, research has found connections between handedness and other learning difficulties. Genetics play a key role, as some dyslexic genes co-express within cilia, explaining the genetic underpinning of brain development and its potential influence on dyslexia risk. Simultaneously, handedness may mitigate some of the symptoms of other disorders like autism, which are often linked to leftward directing. These findings highlight the multifaceted relationship between handedness and a range of learning challenges, suggesting that further research is needed to fully understand these connections. Despite this, the established link between handedness and dyslexia remains a subject of debate, inviting continued exploration and intervention.

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