QEEG | Attention Deficit Specialists

Learn more about QEEG, or Quantitative Electroencephalography

Electroencephalography (EEG) is the measurement of electrical patterns at the surface of the scalp which reflect cortical activity, and are commonly referred to as “brainwaves”. Quantitative EEG (qEEG) is the analysis of the digitized EEG, and in lay terms this sometimes is also called “Brain Mapping”. The qEEG is an extension of the analysis of the visual EEG interpretation which may assist and even augment our understanding of the EEG and brain function.

QEEG is a procedure that processes the recorded EEG activity from a multi-electrode recording using a computer. This multi-channel EEG data is processed with various algorithms, such as the “Fourier” classically, or in more modern applications “Wavelet” analysis). The digital data is statistically analyzed, sometimes comparing values with “normative” database reference values. The processed EEG is commonly converted into color maps of brain functioning called “Brain maps”.

The EEG and the derived qEEG information can be interpreted and used by experts as a clinical tool to evaluate brain function, and to track the changes in brain function due to various interventions such as neurofeedback or medication.

Quantitative Electroencephalography (qEEG) processing techniques and the use of modern analytic software to processes the EEG/qEEG gives us the ability to view the dynamic changes taking place throughout the brain during cognitive processing tasks, and this novel approach can be used to assist us in determining which areas of the brain are engaged and processing efficiently.

Various analytic approaches exist, from commercial databases to database free approaches, such as EEG phenotype analysis or the more classic European Vigilance model of Bente (1964) are used in modern clinical application of the EEG/qEEG. The use of advanced techniques such as Independent Component Analysis (ICA) and neuro-imaging techniques such as Low Resolution Electromagnetic Tomography (LORETA) can map the actual sources of the cortical rhythms. These advanced approaches are changing our understanding of the dynamics and function of the human brain.(cited from http://bio-medical.com/news/2008/12/what-is-qeeg-or-brain-mapping/)

QEEG Research

Research with quantitative electroencephalography (QEEG) has been done since the 1970s. There have been thousands of articles published on the subject with various diagnostic categories. For more articles not included here, visit Medline at http://www.ncbi.nlm.nih.gov/pubmed.  Some of the key authors in this area include Chabot (NYU), Clarke (Australia), Arns (Netherlands), and Monastra (NY).

Conventional and Quantitative Electroencephalography in Psychiatry, Journal of Neuropsychiatry and Clincial Neuroscience, Spring 1999

The Clinical Role of Computerized EEG in the Evaluation and Treatment of Learning and Attention Disorders in Children and Adolescents, Journal of Neuropsychiatry and Clinical Neuroscience, Spring 2001  

A Meta-analysis of Quantitative EEG Power Associated With Attention-Deficit Hyperactivity Disorder, American Clincial Neurophysiology Society, 1996

EEG-defined Subtypes of children with Attention-Deficit/Hyperactivity Disorder, Clinical Neurophysiology, 2001

The quantitative EEG theta/beta ratio in attention deficit/hyperactivity disorder and normal controls: Sensitivity, specificity, and behavioral correlates, Psychiatry Research, 2012–abstract only (contact our office for full article)

Sensitivity and Specificity of QEEG in Children with Attention Deficit and Specific Learning Disabilities, Clinical Electroencephalography, 1996

QEEG Neurometrics and Differential Diagnosis of ADHD, Behavioral Neurotherapy Clinic, 2002
Blinded, multi-center validation of EEG and rating scales in identifying ADHD within a clinical sample, Psychiatry Research, 2008

QEEG ADHD Review, Clinical Neurophysiology, 2003

The Effects of QEEG-Informed Neurofeedback in ADHD: An Open-Label Pilot Study, Applied Psychophysiology and Biofeedback, 2012