Dyslexia may be caused by impaired connections between auditory and speech centers of the brain, according to a study published today in Science. The research could help to resolve conflicting theories about the root causes of the disorder, and lead to targeted interventions. When people learn to read, their brains make connections between written symbols and components of spoken words. But people with dyslexia seem to have difficulty identifying and manipulating the speech sounds to be linked to written symbols. Researchers have long debated whether the underlying representations of these sounds are disrupted in the dyslexic brain, or whether they are intact but language-processing centers are simply unable to access them properly.