QEEG Brain Mapping
(Quantitative Electroencephalogram; about 2hrs.):

Brain mapping is used to obtain detailed information regarding the brain-wave status of a person’s brain such as what dimensions of brain functioning need to be normalized. This non-invasive and painless procedure is the foundation for developing an individualized treatment plan. It can also be useful in evaluating the course of treatment.

Data Acquisition:

EEG, or brain electrical activity, is digitally recorded from 19 electrode sites on the scalp using an appropriate size electrocap and a Lexicor Medical Systems NRS-24 EEG recorder. The location of the 19 electrodes corresponded to the International 10-20 system of electrode placement. The montage, or type of reference system employed, is referential, namely, linked ears.

Activation Conditions:

Several conditions are typically recorded: eyes closed baseline; eyes open baseline; eyes open - visual task; and eyes open - listening task. Separate analyses (as described below) are conducted for each condition.

Data Preparation & Analysis:

Data acquisition is conducted using the Lexicor Neurolex program and then imported into the NeuroGuide analysis software (Applied Neuroscience, Inc.). EEG waveforms are inspected visually off-line and then edited to remove artifacts such as eye movements, muscle contamination, and body movement. EEG data are then subjected to a quantitative spectral analysis with results ranging from 1 to 30 Hz.

Normative Database Comparison:

Artifacted QEEG data are compared to a normative database utilizing the latest version of NeuroGuide software package that includes the Lifespan EEG Reference Database (Thatcher et. al, 1989). This evaluation involves comparing the client’s EEG results to an age-related normative sample whose QEEG patterns are within a normal range of neuroelectric functioning.

Significant differences between the QEEG patterns of the client and those of the normative group are evaluated by rigorous statistical standards, and recorded on colored maps and topographs which constitute a QEEG evaluation/report. Statistically deviant QEEG findings typically indicate neuroelectric dysregulation, which can be associated with numerous types of psycho/physical symptoms.

Presentation of Results:

Analyses are presented in terms of traditional broad band frequency ranges (i.e., Delta, Theta, Alpha, and Beta) as well as single band frequencies. In the case of the broad band analyses, five major QEEG parameters are assessed including coherence, phase, asymmetry, absolute power, and relative power. Single band frequency analyses provide a fine grained analysis of the data as well as important information for developing neurofeedback-training protocols.

Results can also be presented using low resolustion electromagnetic tomography or LORETA using the EureKa3! and LORETA-Key software packages. This technique allows for the localization of the source of electrical activity within a three-dimensional space of the brain using a generic MRI image as a visual reference. LORETA analysis involves DC source potential rather than cortical electrical potentials.

© 2003 John W. DeLuca, Ph.D. All Rights Reserved