Human brainwave activity is too subtle to read unless the signal is amplified. These units available now usually connect through a USB port and transmit signals to the therapist computer. Older units use a serial interface.

EEGer4 Neurofeedback software supports a variety of EEG amplifiers, each with varying signal characteristics.

Details of these amplifiers are documented in the EEGer4 Technical Manual, available here [PDF].

The significant characteristics for any amplifier are: linearity, bandpass, and connection (to computer).
  • The linearity has to do with how evenly the amplifier "amplifies" the incoming EEG.
  • The bandwidth tells how low and how high in frequency the amplifier can pass data.
  • The ideal amplifier would linearly amplify all frequencies of interest.
  • Connections to the computer can be either serial (wired or Bluetooth) or USB.
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