Quantitative EEG

Quantitative EEG

Data concept: Head With Lightbulb on wall backgroundQuantitative electroencephalography, also known in short as qEEG, is a non-invasive method of recording, measuring and analysing the brain’s electrical activity. The process of recording the electrical activity along the scalp is called electroencephalography – EEG, and was introduced nearly 100 years ago. However, until 1990’s the recordings were made on analogue equipment and any detailed analysis of recorded signals was very difficult or impossible. With the introduction of digital equipment and devices, these complex waveforms, which are the combined representations of various frequencies, could be deconstructed and analysed.

With the computational power of modern software it is now possible to establish your brain function profile (BFP). The most common mathematical analytic approach uses Fourier analysis. This process deconstructs the EEG time series into a voltage by frequency spectral graph called the “power spectrum”.

The EEG patterns produced by the brain remain stable over days, weeks, months and even years, and therefore provide a reliable signal for analysis. Furthermore, these patterns appear to be inherited genetically, because similar spectral profiles have been recorded from monozygotic twins.

The bioelectrical wave patterns fall into a number of frequency bands or EEG bands. These are named delta (1-4 Hz), theta (4-8 Hz), alpha (8-13 Hz) and beta (13-30 Hz) bands and are observed normally or pathologically in different conditions or pathologies. For example, delta band waves are produced normally in adult slow-wave sleep and in babies, but pathologically in brain lesions; theta band occurs in drowsiness or arousal; alpha band is dominant during the “idle” or “ready but not doing much” state of the brain; and beta band is seen during alert, active, busy, concentrated or anxious thinking states. The science of deciphering the EEG bands and comparing the patterns to various databases in order to detect brain dysfunctions forms the basis of quantitative electroencephalography, qEEG.

In our clinic we use state-of-the-art recording systems and analysis methods to determine your BFP and compare it to large international normative databases. If any deviation from normal patterns is detected, the appropriate training and therapy recommendation is made using best-practice guidelines established in the scientific literature.