In recent years,
transcranial direct current stimulation (
tDCS) has been used as a safe and non-invasive method for children and adolescents with
dyslexia. Our aim in this study was to investigate the effect of
tDCS on variables of temporal resolution and speech long-latency auditory-evoked potentials with two
electrode arrays on superior temporal gyrus (STG). A total of 17 children and adolescents with
dyslexia (age 9-12 years) were included in our study. All participants underwent the gap in noise (GIN) test and long-latency auditory-evoked potentials recording at baseline without applying
tDCS,
sham (placebo), and after 20 min of exposure to two different
tDCS polarities:
anode of
tDCS on left STG/cathode on the right shoulder and
anode on the left STG/cathode on right STG to enhance left lateralization. Our results showed significant decreases in the threshold value and increases in the percentages of correct responses in the GIN test. We also found reduced latency and increased amplitude of the P1, N1, and P2 waves in two stimulation polarities compared with baseline and
sham. Our findings indicate the potential role of
tDCS on improving the characteristics of central auditory processing, especially temporal information processing in children and adolescents with
dyslexia, and could introduce a new strategy to facilitate the rehabilitation of central
auditory processing disorders in future.