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Selective enhancement of low-gamma activity by tACS improves phonemic processing and reading accuracy in dyslexia
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Selective enhancement of low-gamma activity by tACS improves phonemic processing and reading accuracy in dyslexia
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Journal Article
Selective enhancement of low-gamma activity by tACS improves phonemic processing and reading accuracy in dyslexia
2020
Overview
The phonological deficit in dyslexia is associated with altered low-gamma oscillatory function in left auditory cortex, but a causal relationship between oscillatory function and phonemic processing has never been established. After confirming a deficit at 30 Hz with electroencephalography (EEG), we applied 20 minutes of transcranial alternating current stimulation (tACS) to transiently restore this activity in adults with dyslexia. The intervention significantly improved phonological processing and reading accuracy as measured immediately after tACS. The effect occurred selectively for a 30-Hz stimulation in the dyslexia group. Importantly, we observed that the focal intervention over the left auditory cortex also decreased 30-Hz activity in the right superior temporal cortex, resulting in reinstating a left dominance for the oscillatory response. These findings establish a causal role of neural oscillations in phonological processing and offer solid neurophysiological grounds for a potential correction of low-gamma anomalies and for alleviating the phonological deficit in dyslexia.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Adult
/ Adults
/ Auditory Cortex - physiopathology
/ Auditory Cortex - radiation effects
/ Cortex
/ Dyslexia
/ EEG
/ Evoked Potentials, Auditory - physiology
/ Evoked Potentials, Auditory - radiation effects
/ Female
/ Humans
/ Language
/ Male
/ Medicine and Health Sciences
/ Memory
/ Methods
/ Reading
/ Research and Analysis Methods
/ Speech Perception - physiology
/ Speech Perception - radiation effects
/ Stimuli
/ Transcranial Direct Current Stimulation - methods
/ Verbal Behavior - physiology
