Dyslexia Caused by Faulty Signal Processing in Brain; Finding Offers Clues to Potential Treatments
8th August 2012
Under the direction of Katharina von Kriegstein, the researchers conducted two experiments in which several volunteers had to perform various speech comprehension tasks. When affected individuals performed tasks that required the recognition of speech sounds, as compared to recognize the voices that pronounced the same speech, magnetic resonance tomography (MRT) recordings showed abnormal responses in the area around the medial geniculate body. In contrast, no differences were apparent between controls and dyslexic participants if the tasks involved only listening to the speech sounds without having to perform a specific task. “The problem, therefore, has nothing to do with sensory processing itself, but with the processing involved in speech recognition,” says Díaz. No differences could be ascertained between the two test groups in other areas of the auditory signalling path.