Physical injury to the brain, such as concussion, disrupts normal flow of electrical impulses in the brain tissue. Similarly, toxic injury, seizure disorder, Alzheimer’s disease, anoxia (absence of oxygen), and brain infection (e.g., chronic Lyme encephalitis) alter brainwave activity. ADD, OCD, anxiety, depression, and Learning Disability have distinct brainwave “signatures” as well.
EEG (or electroencephalogram) is a recording of brainwave activity. QEEG (Quantitative EEG), popularly known as brain mapping, refers to a comprehensive analysis of brainwave frequency bandwidths that make up the raw EEG. QEEG is recorded the same way as EEG, but the data acquired in the recording are used to create topographic color-coded maps that show electrical activity of the cerebral cortex.
While other brain imaging techniques (e.g., CT, MRI, PET, SPECT) measure such properties as cerebral blood flow, metabolism or structural integrity, QEEG measures electrical activity of the brain. It provides complex analysis of such brainwave characteristics as symmetry, phase, coherence, amplitude, power, and dominant frequency.
LORETA (Low Resolution Electromagnetic Tomography Analysis) allows viewing of 3-dimensional electrical current sources in the brain. It uses data obtained in the QEEG recording and employs standard MRI atlas images with anatomical Talairach coordinates for 3-dimensional gray matter modeling.
The QEEG and LORETA findings are then compared to a normative database. This database consists of brainwave recordings of several hundred healthy individuals. Comparisons are displayed as Z scores, which represent standard deviations from the norm.
Preparing for you Full Brain Map is very easy. Avoid any stimulants, including coffee, at least 2 hours prior to your appointment. You should expect the assessment to take approximately 40 minutes:
20 minutes for preparation
10 minutes of assessment with your eyes closed
10 minutes of assessment with your eyes open
We strongly suggest that you bring a hat as we cannot guarantee that we will be able to remove all the gel from your hair. Washing your hair after a Full Brain Map is often the best solution.