Brain scans shed light on how practice and genetics combine to influence reading ability
Scientists have mapped the reading brain, finding that genetics set the foundation for processing sounds and meaning. Meanwhile, the physical act of reading practice actually thickens specific brain regions and optimizes communication pathways.
A recent study published in Cerebral Cortex has shed light on the complex interplay between genetics and practice in shaping reading ability. The research, which involved analyzing brain imaging and behavioral data from 1,068 young adults, revealed that our foundational ability to process sounds and meaning is strongly inherited.
However, the brain connections that link these skills together are sculpted by reading experience. The study found that differences in reading ability across the general population exist on a continuous spectrum of brain anatomy, with learning to read involving the brain's ability to link written symbols to spoken language and concepts.
This process relies on two complementary networks: the phonological route, which maps written letters to speech sounds and relies heavily on the auditory cortex; and the semantic route, which maps whole words directly to their meanings and leans on the anterior temporal lobes. The findings suggest that understanding the micro-level structure of specific functional zones within the brain can provide better insights into how neurodevelopmental variation shapes reading ability in the wider population.
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