|q e e g/r e e g
What Is A
electroencephalography (QEEG) began in the 1970's as a way of using computers
to extract more information from raw brain wave data than was possible by
the traditional approach of looking at brain wave tracings on paper. Although
many abnormal patterns of brain wave activity are readily apparent during
visual inspection, such as the "spike and wave" associated with epileptic
seizures, others can be seen by a computer in ways not possible with the
human eye. Your digitized brain wave data will be compared to a normative
database to determine if your EEG contains activity that is significantly
different from what is normal for someone of your age. That
information is then used to create an individualized neurofeedback treatment
plan to help you train your brain to work normally and efficiently.
What Does A QEEG Tell You About
A QEEG will give you information
on a number of aspects of your brain wave functioning:
and relative power are indications
of the balance of activity in each brain wave band (beta, alpha, theta
and delta) as compared to the other bands. When there is too much or
too little activity in one or more of the brain wave bands, the brain
is not working efficiently. For example, many people with ADHD often
have too much theta activity compared to their beta activity when
their eyes are open. In practical terms, this means that their brains
are producing an excess of waves associated with internal focus and
drowsiness (theta) and not enough of the waves associated with external
focus and alertness (beta).
is a measure of how much electrical activity is shared between different parts
of your brain. High coherence between two locations means that they
sharing too much electrical activity. Low coherence means that the two
sites are not sharing enough electrical activity. Both indicate that the brain is not using its resources efficiently.
Coherence deviations are often seen in persons with traumatic brain injury, learning disabilities
and autistic spectrum disorders.
is a measure of the speed with which
signals travel through your brain. The brain’s ability to process
information is impaired if electrical signals are moving too slowly
or too quickly from one part of the brain to another. You can think of phase as being similar to trying to hit a baseball. A ball that
comes at you at medium speed is easy to hit. If the pitcher throws
a fastball, the ball may have passed you before your bat can touch
it. A slow, high pitch can also be hard to hit. As with coherence,
phase deviations indicate that the brain is not working efficiently
EEG data can also be used to perform a discriminant analysis, which is
the use of a mathematical formula to determine if your brain
waves have the characteristics that are associated with certain medical
and psychiatric disorders. Discriminant analyses that look for EEG signs
of traumatic brain and learning disabilities are used if needed.
How Is A QEEG Performed?
A QEEG is performed while you are
awake and sitting in a comfortable chair. The first 30 to 45 minutes of
the QEEG session is devoted to placement of the EEG sensors on your head.
Until relatively recently, each of the 19 scalp electrodes had to be individually
glued on. However, the development of an electrode cap has made the process
much easier. The cap, which looks like a mesh fabric shower cap, has the
electrodes implanted in it. It is placed on your head and conductive paste
is squirted into the electrodes to assure that they make a good connection
with your scalp. Two other electrodes, which look like clip-on earrings,
are attached to your ears. Most people find that the cap and ear clip electrodes
cause very little discomfort.
Once the cap and ear electrodes are
in place and their connections have been checked, ten minutes of eyes closed
and eyes open brain wave activity is recorded. You will be asked to sit
with your eyes closed and remain as still as possible and then sit with
your eyes fixed on a particular spot to help reduce eye movement. The brain
functions differently with the eyes open versus eyes closed, so seeing
how your brain is working in both conditions is important. In some instances
another ten minutes of brain wave activity is recorded during performance
of a task, such as reading or doing mathematics.
Does your child have
a hard time sitting still for more than a few minutes? This is a problem
that is frequently encountered when doing a QEEG with ADHD children. There
are a number of ways to deal with it, such as taking frequent breaks or
having the child sit on your lap. It is recommended that you bring along
a DVD, book or portable video game to help keep your child entertained
while the sensor cap is being attached.
What Is A
Finding the right medicine to treat ADD/ADHC,
depression or anxiety can be a challenge. How can you knowwhich medicine to take or which one not to take?
Referenced EEG (rEEG) is a way of analyzing your brain wave activity that can help guide you and your physican in making medication choices.
The rEEG software looks for biomarkers in your brain waves that predict success or failure with five classes of psychiatric drugs.
The EEGs of over 18,000 people were used to develop the rEEG database. The data contained in the rEEG report can significantly reduce the trial and
error that is often associated with finding the right medication to treat depression, anxiety and ADD/ADHC.
Click here to download sample QEEG maps!
2003 Aharon Shulimson Ph.D.