Quantitative EEG (QEEG)
What is the QEEG?
The Quantitative EEG is a brainwave assessment that is used in our office to to assist in neurofeedback treatment planning. The QEEG is the measurement, using digital technology, of electrical patterns at the surface of the scalp which primarily reflect cortical electrical activity or "brainwaves." It is a computerized form of the electroencephalogram (EEG). The QEEG is becoming of increasing value in guiding the neurofeedback process because of recent improvements in the databases used and in the manner in which the data is utilized to formulate an individualized treatment plan.
Once the QEEG data is gathered, we select areas of the raw data that are free from 'artifact'(eye movements, muscle tension, etc). Those data sections are then analyzed statistically. The size, frequency and coordination of the various waves are measured by the software and presented as numbers and as statistical "brain maps." This is done by a computerized normative database called NeuroGuide. It is a normative life-span wide reference database that shows how the person's brain activity compares, on the average across a particular task, to healthy people of similar age and same sex. More information on this database can be found at: http://www.appliedneuroscience.com.
The QEEG is not intended to be a "stand alone" diagnostic or as a substitute for other medical diagnostics. The QEEG is best used as an tool to aid in the clinical diagnosis of various dysfunctional states and not as a substitute for clinical judgment and medical opinion. It should be combined with other medical, psychological and neuropsychological data to best aid the patient.
Below is a statistical topographic map from a QEEG report. The small dots on each circle represent the recording electrodes on the head. Each separate circle represents the electrical power that was found at a particular frequency (from 1 to 30 Hz) throughout the cortex.
The numbers generated on the report are Z scores. A Z score is a metric which represents how similar a score is to the 'normal population' as defined by the NeuroGuide database. A Z score of +1 represents a score exceeding 84% of individuals that age; +1.25 exceeds 89%; +1.5 exceeds 93%; +2.0 exceeds 98%. Notice the first row maps the 1-5 cycle per second (Hz) waves, the second row maps 6-10 Hz waves, etc. The white areas indicate that the size of the waves is normal at that frequency. The heads use colors to represent the Z scores at the 19 sites, with the nose on the top. White (or no coloration) represents scores that are normal (+/- 1 Z score). Red indicates 3 standard deviations above the mean power for the person's age and sex.
What is it like to have a QEEG done?
The actual process involves putting a cap on the head and placing electrode conductive gel into each of twenty sensors on the cap. It is necessary to press the conductive gel down through the hair so that it makes a good electrical contact. Rarely, but occasionally people who are very sensitive to touch find this process uncomfortable. However, most people can easily tolerate the process.
Once the cap is on it is necessary for the individual to sit very still with eyes still and upper body muscles relaxed. It is not necessary to remain this way for prolonged periods, as we can stop and take breaks during which time the person can move around.
If the individual being mapped takes medication that could interfere with the process, in some instances it may be desirable, with the prescribing physician’s approval and instructions, to discontinue the medication before doing the mapping process. If any such medication is being taken, be sure to inform us at the time you make an appointment for the QEEG.
Neurologists, the physicians whom historically have most utilized EEG information, are divided on the value of the QEEG and that some professionals consider it to be investigational in nature. None-the-less, many clinicians who provide neurofeedback consider the QEEG to be very valuable in planning a neurofeedback treatment course. As is the case with the neurofeedback process itself, having a QEEG done isn't guarenteed to lead to successful neurofeedback treatment. However, it is the experience of many clinicians that the QEEG frequently leads to more efficient and more effective neurofeedback.
Cost and Information Related to Billing Insurance
The cost of the QEEG is $500 for the basic test. The fee for the test covers the cost of data acquisition, processing through the NeuroGuide normative database, and a written report summarizing the findings. Generally you assume that such costs will not be covered by your insurance. However, there are individuals who have been reimbursed by their insurance companies for the test. Please contact your insurance company for more information.