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Related Experiment Videos

A new vibrotactile stimulator for functional MRI.

G S Harrington1, C T Wright, J H Downs

  • 1Neurolmaging Research Lab, University of Virginia, Charlottesville, USA.

Human Brain Mapping
|July 27, 2000
PubMed
Summary

This study introduces a novel piezoceramic vibrotactile stimulator for functional MRI (fMRI) experiments. The nonmagnetic device effectively delivered tactile stimuli, revealing brain activation in sensory cortex areas.

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Sensory Neuroscience

Background:

  • Delivering mechanical vibration stimuli during functional MRI (fMRI) is challenging due to scanner's high magnetic fields interfering with electronic components.
  • Conventional vibration devices often contain circuitry that is incompatible with the MRI environment, limiting experimental possibilities.

Purpose of the Study:

  • To design and validate a nonmagnetic, circuitry-free piezoceramic vibrotactile stimulator for safe and effective use within an fMRI scanner.
  • To assess the feasibility of using this stimulator to evoke measurable brain responses during fMRI.

Main Methods:

  • A piezoceramic vibrotactile stimulator was engineered, utilizing the nonmagnetic properties of piezoelectric ceramics and an alternating current delivered via a simple wire.

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  • The stimulator's safety and efficacy were tested in a functional MRI experiment.
  • Participants received vibrotactile stimulation at 35 Hz and 150 Hz.

    • Main Results:

    • The piezoceramic vibrotactile stimulator proved safe and effective for use in fMRI experiments.
    • Brain activation was detected in the primary sensory cortex in response to the tactile stimuli.
    • Activation was also observed in Brodmann area 40 at both tested frequencies (35 Hz and 150 Hz).

    Conclusions:

    • Piezoceramic technology offers a viable solution for delivering vibrotactile stimuli within high magnetic field environments like MRI scanners.
    • This novel stimulator enables new research avenues into tactile sensory processing and its neural correlates using fMRI.