Abstract
Electroencephalogram (EEG) acquisition systems are widely used as diagnostic and research tools. This document shows the implementation of a reconfigurable family of three affordable 8-channels, 24 bits of resolution, EEG acquisition systems intended for a wide variety of research purposes. The three devices offer a modular design and upgradability, permitting changes in the firmware and software. Due to the nature of the Analog Front-End (AFE) used, no high-pass analog filters were implemented, allowing the capture of very low frequency components. Two systems of the family, called “RF-Brain” and “Bluetooth-Brain”, were designed to be light and wireless, planned for experimentation where movement of the subject cannot be restricted. The sample rate in these systems can be configured up to 2000 samples per second (SPS) for the RF-Brain and 250 SPS for the Bluetooth-Brain when the 8 channels are used. If fewer channels are required, the sampling frequency can be higher (up to 4 kSPS or 2 kSPS for 1 channel for RF-Brain and Bluetooth-Brain respectively). The third system, named “USB-Brain”, is a wired device designed for purposes requiring high sampling frequency acquisition and general purpose ports, with sampling rates up to 4 kSPS.
Highlights
Flexible electroencephalogram (EEG) acquisition systems are required in a wide variety of research fields including brain computer interfaces (BCI) [1], [2], evoked potentials (EPs) [3], [4] stress response [5], [6], epilepsy [7]–[9], depth of anesthesia [10]–[12], among others
EEG systems’ extended use is due to its noninvasive nature, high temporal resolution and lower cost compared with other modalities of brain activity monitoring such as functional magnetic resonance imaging or magnetoencephalography (MEG)
Commercial EEG research systems do not always offer flexibility to configure their settings, such as sampling frequency, location and configuration of the electrodes and individual gain of the channels, among others; and their prices can be high [13], [14]. The accessibility to these main features is critical in the experimentation design
Summary
Flexible electroencephalogram (EEG) acquisition systems are required in a wide variety of research fields including brain computer interfaces (BCI) [1], [2], evoked potentials (EPs) [3], [4] stress response [5], [6], epilepsy [7]–[9], depth of anesthesia [10]–[12], among others. Commercial EEG research systems do not always offer flexibility to configure their settings, such as sampling frequency, location and configuration of the electrodes and individual gain of the channels, among others; and their prices can be high [13], [14]. The accessibility to these main features is critical in the experimentation design. The selection of the reference electrode could significantly affect the quality of the acquired data [17]–[19], but changing and testing different locations is time consuming; the possibility of selecting the reference electrode by software, among the electrodes already positioned
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