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Brain Mapping or QEEG

What is Brain Mapping or QEEG?


QEEG (Quantitative Electroencephalogram) or Brain Mapping is a procedure that records neural activities of the brain from at least 19 locations on the scalp. Very similar to the Electrocadiogram or EKG which measures activities of the heart at the surface of the chest, QEEG measures activities of neurons or brain cells at the surface of the scalp simultaneously from at least 19 locations. It is important that the activities are measured simultaneously or at the same time, so that we can understand how the brain work as a whole. Studies showed that a minimum of 19 locations is required to map our brain function. More is better but any thing less than 19 locations will not provide sufficient resolution.


QEEG is Safe and non-invasive:


Like neurofeedback, QEEG is a safe and non-invasive assessment. Sensors are first placed on the surface of a person's scalp. Then, EEG activity is measured under different states and tasks that a person frequently encounters, such as eyes closed, eyes open, reading, writing, listening, doing arithmetic and etc. We only measure what the brain sends out, nothing is discharged into the brain.


A Brain Imaging Technique


The QEEG assessment can be considered as a brain imaging technique. It lets us see what the brain is doing. Our brain is so well protected by the skull such that we cannot see or feel what the brain is doing. A QEEG assessment will provide an invaluable picture of the state of our brain and how we are utilizing it.


Comparing it with functional Magnetic Resonant Imaging (fMRI), QEEG is superior in terms of time resolution as it can measure changes in EEG within millisecond. FMRI requires about two seconds to form an image.


From the QEEG assessment, we can see:


  1. How one is regulating sensory information
  2. Areas that are over-active
  3. Areas that are fatigue or exhausted
  4. Areas that shut-down while on task
  5. Which regions of the brain are utilized for a specific task
  6. How each brain regions are working together
  7. Maturity of different parts of the brain (our brain does not mature uniformly)
  8. Hidden seizures
  9. Focal location of epilepsy and many more


At Spectrum Learning, we routinely do a QEEG assessment for our clients. With this information, we can then design a specific brain exercise program using neurofeedback. This leads to a more effective brain exercise. For example, those regions that are exhausted, we can train for recovery. For those areas that are weak, we can train to increase the neural activities. This tends to produce faster results.


How a Brain Mapping is done:


The Setup:


The process is rather simple. First a QEEG cap is put on the child whose brain waves (EEG) we are going to measure.


The picture on the left shows a child getting ready for a QEEG. The QEEG cap that she is wearing has 19 sensors to measure her brain waves from 19 locations.


QEEG with at least 19 locations is now the standard. Anything less than 19 locations is not sufficient to map the entire brain reasonably well. More sensors are preferred for higher spatial resolution. At Spectrum Learning, we can assess 19 or 32 locations.





Once the QEEG cap is put on securely and the electrode contacts are established, the QEEG cap is connected to an EEG amplifier.


The EEG amplifier is then connected to a computer and the measurement of the brain waves (EEG) can start. Your child will be given tasks to do. While on each task, his/her brain waves (EEG) are measured and recorded by the computer. The measured brain waves will be analyzed after all necessary tasks are done.




The Data Acquisition:















The picture above shows a segment of the recorded brain waves (EEG). The recorded brain waves has to be cleaned to remove artifacts (signals not from the brain) and other signals such as heart beat which can distort the analysis. Once the recorded brain waves are clean of artifacts, it is analyzed in a variety of ways. How the brain waves are analyzed varies between different QEEG providers.


The Analysis:


Spectrum Learning has the most elaborate QEEG analysis. Most centers only analyze Eyes Open and Eyes Close EEGs. We have gone further to analyze on task EEGs and dynamic changes in the EEGs. This will reveal important information that will let us know what is going on in the brain.


One of the most common way to analyze brain waves is to plot the spectral graph:


















The above shows the spectral distribution of a child with Irlen Syndrome.


Plotting the topogragh is another way of analyzing the brain waves:


















The above are all basic analysis of brain waves. One of the advance methods that we use is the Independent Component Analysis. This allows us to determine the source of the problem. Below is an example of the ICA to determine the underlying source:















In the diagram above, the ICA indicated that there is a strong Alpha component coming from a location deep in the head near the center. However, the EEG component appears mostly at the back of the head.


We can further investigate the source using sLORETA:







































As mentioned earlier, we do dynamic change analysis to further assess how your child uses his/her brain while on a task. This will reveal exciting information about what goes on inside your child’s brain in a very safe manner.


These are the advance technology that we have to find the causes of your child’s learning and developmental problems.


Contact us if you need more information.

Brain Mapping - QEEG


Brain Mapping (QEEG) is a safe and non-invasive brain imaging technique. It measures brain waves (EEG) that the brain sends out from at least 19 locations simultaneously.


Careful analysis of these brains waves (EEG) can reveal information on how one is using his/her brain. It can also tell us the maturity of different parts of the brain. It is often used to investigate if there are any hidden seizures.


Read more …

Technologies


QEEG / Brain Mapping


What is QEEG / Brain Mapping?

QEEG Brain Mapping Functional Areas of Brain QEEG vs mini-QEEG