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Related Experiment Videos

Avoiding electromagnetic artifacts when recording auditory steady-state responses.

Terence W Picton1, M Sasha John

  • 1Rotman Research Institute, Baycrest Centre for Geriatric Care, University of Toronto, Canada. tpicton@rotman-baycrest.on.ca

Journal of the American Academy of Audiology
|November 24, 2004
PubMed
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Electromagnetic artifacts in auditory steady-state responses are caused by aliasing. Techniques like adjusting analog-digital conversion rates or using specific stimuli, such as alternating SAM tones, can mitigate these artifacts.

Area of Science:

  • Auditory Neuroscience
  • Neurophysiology
  • Signal Processing

Background:

  • Electromagnetic artifacts can contaminate recordings of auditory steady-state responses (ASSRs).
  • These artifacts are particularly problematic when using sinusoidally amplitude modulated (SAM) stimuli.
  • High-intensity stimuli, whether air- or bone-conducted, can elicit responses unrelated to true auditory perception.

Purpose of the Study:

  • To investigate the origin of electromagnetic artifacts in ASSR recordings.
  • To identify methods for preventing or minimizing these artifacts during EEG acquisition.
  • To compare the effectiveness of different artifact mitigation strategies.

Main Methods:

  • Recording multiple auditory steady-state responses using sinusoidally amplitude modulated (SAM) stimuli.

Related Experiment Videos

  • Employing high-intensity air- and bone-conducted stimuli.
  • Manipulating analog-digital (AD) conversion rates and electroencephalographic (EEG) signal filtering.
  • Utilizing stimuli such as beats and alternating SAM tones.

    • Main Results:

    • High-intensity stimuli produced artifacts, even when hearing was masked.
    • Bone-conducted stimuli evoked distinct artifacts compared to air-conducted stimuli.
    • Artifacts were identified as aliasing, absent with high AD rates or low-pass filtering.
    • Alternating SAM tones produced results similar to conventional SAM tones, while beats yielded smaller responses.

    Conclusions:

    • Aliasing is the primary cause of electromagnetic artifacts in ASSR recordings.
    • Adjusting AD conversion rates and employing specific stimulus types can displace aliased energy.
    • Alternating SAM tones offer a viable alternative to conventional SAM stimuli for artifact reduction.