The EEG NeuroAmp amplifies the signals from your EEG electrodes and peripheral sensors. These signals are then converted to numbers that can be processed by the biofeedback software running on your PC. That conversion process involves very frequent measurements of the five sensor signals. The EEG NeuroAmp measures a thousand times per second, i.e. the sampling rate is one kilohertz. The amplifiers not only amplify your bio signals, they also amplify all kinds of electromagnetic noise that is around you. Most frequency components of that noise are way beyond the EEG or peripheral sensor signal spectra, but they are measured anyway, if there are no counter measures built in to the device. In that case, much of that noise would appear in the EEG spectrum and look like a part of the EEG signal. That effect is called "aliasing".

The EEG NeuroAmp contains two high-performance filters to avoid this aliasing effect to make sure that your EEG readings are not compromised.