HOW DOES Z-SCORE NEUROFEEDBACK WORK?
Z-Scores are statistical data used to compare to what is considered optimal or balanced; in this case, how the brain performs. A normative database is created from thousands of QEEGs thought to have “normal” functioning that are arranged by age and gender. A Z-score = 0 does not mean “normal” in terms of intelligence or abilities. A Z-score = 0 reflects when the brain is most dynamic and displays its greatest flexibility. It’s evident that there would be variation among individuals, which is accounted for by standard deviation (SD). Optimal brain wave activity falls between one SD above or below Z = 0. Brain wave activity that is less than normal falls between two SDs above or below Z = 0. Generally, any activity that falls more than 2 SDs above or below Z = 0 is considered abnormal brain wave activity and may be linked to the client’s symptoms.
When your QEEG assessment is compared to a normative database, this tells us which areas in the brain are optimal, too high, or too low and in what brainwave frequencies when compared to the norm. Your brain is then trained towards this optimal/balanced in multiple dimensions (communication, speed of information transfer, activation processes, etc.). Thousands of Z-scores are monitored in real time and when these Z-scores enter the “optimal” range, the client is rewarded with audio and visual feedback. The more of these Z-scores enter the optimal range, the greater the amount reward. Over time, the brain is trained to be more efficient, which may result in the reduction of symptoms.