New research uncovers brain structures that shape how we learn to read

The paper, published in Cerebral Cortex, examined how variations in brain structure relate to reading performance by analyzing scans of healthy young adults from the Human Connectome Project and comparing twins with differing genetic overlap. Scores on an adaptive oral reading test served as the metric for literacy. Researchers identified a medial belt area near the left primary auditory cortex, a right dorsal temporal pole, and a left anterior middle temporal gyrus whose size or cellular organization correlated with reading skill and showed genetic influence.

Conversely, greater cortical thickness in the primary auditory cortex and the robustness of fiber bundles linking sound, meaning, and visual word form were associated with reading ability but lacked heritability, implying they develop through auditory training and reading experience. The study argues that innate neural “clay” provides a baseline, while education and practice sculpt the reading network, offering insight into why some individuals, including those who are deaf, blind, or dyslexic, adopt alternative literacy pathways.