<p>Amplitude training was the first neurofeedback “protocol” to be developed, and is uptraining or downtraining the size (or amplitude) of an EEG frequency or range of frequencies. Peak to peak (P – P) and root mean squared (RMS) are measures of a frequency’s amplitude from peak to valley. Single channel EEG feedback is usually simple amplitude training, where the individual is suppressing or enhancing frequency bands of delta, theta, alpha, beta, or hight beeta. The Neurofield amplitude training is currently the only modality that allows for the uptraining of gamma frequencies. In the use of single channel training, a clinician can use ear electrodes as references, or they can use bi-polar training, where one area of the head is trained relative to another area of the head. Amplitude training can also be undertaken using a full 19-channel EEG cap.&nbsp;<br></p>