EEG Coherence and Intelligence in Elementary School Children

The EEG and intelligence are measures that describe the children ́s abilities and could be a parameter to describe the typical and pathological development. The aim of this research was to describe the relationships between the absolute power and intra-interhemispheric coherence of 10 brain areas with the Intelligence Quotient (IQ) of elementary school children. For that, 12 elementary school children (6 boys) of third grade participated, with an average age of 9 years 5 months, all right-handed and with an IQ equal to or greater than 80, as well as having a normal electroencephalogram. Significant differences were found in the left intrahemispheric EEG coherence in all bands as well as in the right intra-hemispheric coherence of the Delta band, where the females had higher values in all measurements. The low Verbal Comprehension Index was associated with lower Beta band on the temporal area and the low Processing Speed Index with higher Beta band values. Regardless of whether the intelligence test has a neuropsychological approach, we found associations between the EEG measures and IQ.