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Updated: Jun 11, 2026

Low-Cost Electroencephalographic Recording System Combined with a Millimeter-Sized Coil to Transcranially Stimulate the Mouse Brain In Vivo
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A compact electroencephalogram recording device with integrated audio stimulation system.

Antti K O Paukkunen1, Anttu A Kurttio, Miika M Leminen

  • 1Department of Electronics, School of Science and Technology, Aalto University, Aalto 00076, Finland.

The Review of Scientific Instruments
|July 2, 2010
PubMed
Summary

This study presents a compact, battery-powered electroencephalogram (EEG) device for high-quality brainwave recording. Its integrated audio system and wireless capabilities enable efficient evoked potential studies.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • High-density electroencephalogram (EEG) recording is crucial for understanding brain activity.
  • Existing portable EEG systems often face limitations in data quality, battery life, or integrated stimulus delivery.
  • Evoked potential studies require precise timing and high signal-to-noise ratio.

Purpose of the Study:

  • To introduce a novel, compact, battery-powered, eight-channel EEG recording device.
  • To integrate an audio stimulation system and wireless data transmission for enhanced experimental flexibility.
  • To evaluate the device's performance in terms of data quality, operating time, and stimulus control.

Main Methods:

  • The device features a compact design (96 x 128 x 32 mm, 374 g) with an 8-bit microcontroller for stimulus control.

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  • It offers a measurement resolution of 4 nV at a 200 Hz sample rate and a noise level below 0.7 microV(rms).
  • Wireless Bluetooth communication transmits data in real-time to a LabVIEW-based PC interface for acquisition and processing.

    • Main Results:

    • The device achieves high-quality EEG data with effective measurement resolution of 4 nV and low noise levels.
    • An integrated audio decoder plays sound files from a memory card with interstimulus interval jitter below 1 ms.
    • The estimated operating time is 1.5 hours, suitable for many evoked potential experiments.

    Conclusions:

    • The presented portable EEG device offers a viable solution for high-quality, wireless brainwave recording.
    • Its integrated audio stimulation and precise timing are beneficial for evoked potential research.
    • The device was successfully demonstrated in a mismatch negativity experiment, showing practical applicability.