Electroencephalography (EEG) measures the electrical patterns at the surface of the head which reflects cortical activity. These patterns are commonly referred to as “brainwaves”. Quantitative EEG (qEEG) is the analysis of these patterns, which is sometimes called “Brain Mapping”. QEEG is a procedure that analyses your EEG activity from a multi-electrode recording. This multi-channel EEG data is processed with various algorithms, statistically analysed, and then compared to a normative database (comparing the brainwaves to a group of children/adults of similar age who are considered ‘neurotypical’). This data is then converted into color maps of brain functioning called “Brain maps”. The qEEG information can be interpreted and used by experts as a clinical tool to evaluate brain function, and to track the changes in brain function due to various interventions such as neurotherapy. QEEG processing techniques and the use of highly technical software to processes this data, gives us the ability to view the dynamic changes taking place throughout the brain during specific neuropsychological/ cognitive processing tasks, and this type of assessment can be used to assist in determining which areas of the brain are engaged and processing efficiently, versus those with are somewhat dysregulated or inefficient.
What is qEEG?
The patient’s head is measured to determine which size sensor cap will be used. The cap is plugged into a 24 channel Mitsar amplifier which is controlled by the WinEEG software. Once the EEG it is analysed further with the WinEEG software and the Human Brain Index database or exported to the Neuroguide database. The cap and its sensors are positioned according to the International 10-20 system; the sensors are prepped with special conductive gel and the connection of each sensor with the scalp is tested. Usually recordings include one or more taken with 1) eyes opened, 2) eyes closed and sometimes 3) during a task such as reading or calculating.