What is Quantitative EEG? QEEG is ordinary (digital) EEG information manipulated in various ways by computer to provide additional information. Used as a guide for neurofeedback protocols, it enhances the effectiveness of the work. Quantitative EEG (QEEG) began in the 1970s and early 80s as an attempt to extract from brain electrical activity, more than what could be readily appreciated by visual inspection of the EEG. 19 channels of Raw EEG data is collected by means of sensors fitted into a lycra cap.  The raw data is artifacted – i.e. the unwanted parts of the record such as eye movement, are discarded.

What are "brainmaps"? Brainmaps are QEEG results presented on schematic maps of the head - i.e. a display technique. The heart of QEEG lies with computerized analytic and statistical techniques. Audra Centre Neurofeedback uses a NeuroNavigator with SKIL software which enables data to be compared to the normative database across four conditions. (eyes open, eyes closed, a reading task and a maths task) This gives an indication of where, and in which frequencies and conditions, a particular brain has difficulty. More info at: www.skiltopo.com http://www.appliedneurosciences.com (The pre-post map images below are used with permission from Bob Gurnee.) The dark blue (delta) and red (alpha) in the first map show low and high levels of these frequencies.  In the second map (second row) these have returned to normal levels.

The following diagrams show another example of pre – post measurement data. Quantitative EEG’s Pre and Post 40 sessions of Neurofeedback in a man aged 50 with brain injury Eyes closed, resting measures for 8-11Hz (alpha) and 12-15Hz (SMR or low beta). In these Topometric Graphs, the black line indicates the population norm and the grey lines indicate 2 standard deviations (SD) above and below it.  More than one SD indicates less than ideal functioning and more than two SD’s indicate possible problem areas.  The red line shows personal data.   The following diagrams show another example of pre – post measurement data. Quantitative EEG’s Pre and Post 40 sessions of Neurofeedback in a man aged 50 with brain injury Eyes closed, resting measures for 8-11Hz (alpha), 12-15Hz (SMR or low beta), and 19-23Hz (beta 2) In these Topometric Graphs, the black line indicates the population norm and the grey lines indicate 2 standard deviations (SD) above and below it.  More than one SD indicates less than ideal functioning and more than two SD’s indicate possible problem areas.  The red line shows personal data.