EEG and intelligence: Relations between EEG coherence, EEG phase delay and power

There are two inter-related categories of EEG measurement: 1, EEG currents or power and; 2, EEG network properties such as coherence and phase delays. The purpose of this study was to compare the ability of these two different categories of EEG measurement to predict performance on the Weschler Inte...

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Bibliographic Details
Published in:Clinical neurophysiology 2005-09, Vol.116 (9), p.2129-2141
Main Authors: Thatcher, R.W., North, D., Biver, C.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Algorithms
Biological and medical sciences
Child
Child, Preschool
Coherence
Cortical Synchronization
Electrodiagnosis. Electric activity recording
Electroencephalography
Eye and associated structures. Visual pathways and centers. Vision
Female
Functional Laterality - physiology
Fundamental and applied biological sciences. Psychology
Humans
Intelligence
Intelligence - physiology
Investigative techniques, diagnostic techniques (general aspects)
Linear Models
Male
Medical sciences
Middle Aged
Nervous system
Neuropsychological Tests
Phase delays
qEEG
Reproducibility of Results
Vertebrates: nervous system and sense organs
Wechsler Scales
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Summary:There are two inter-related categories of EEG measurement: 1, EEG currents or power and; 2, EEG network properties such as coherence and phase delays. The purpose of this study was to compare the ability of these two different categories of EEG measurement to predict performance on the Weschler Intelligence test (WISC-R). Resting eyes closed EEG was recorded from 19 scalp locations with a linked ears reference from 442 subjects aged 5–52 years. The Weschler Intelligence test was administered to the same subjects but not while the EEG was recorded. Subjects were divided into high IQ (≥120) and low IQ (≤90) groups. EEG variables at Prelative power and power ratios. The strongest correlations to IQ were short EEG phase delays in the frontal lobes and long phase delays in the posterior cortical regions, reduced coherence and increased absolute power. The findings are consistent with increased neural efficiency and increased brain complexity as positively related to intelligence, and with frontal lobe synchronization of neural resources as a significant contributing factor to EEG and intelligence correlations. Quantitative EEG predictions of intelligence provide medium to strong effect size estimates of cognitive functioning while simultaneously revealing a deeper understanding of the neurophysiological substrates of intelligence.
ISSN:1388-2457
1872-8952
DOI:10.1016/j.clinph.2005.04.026