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Related Experiment Video

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Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
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Modeling hemodynamic responses in auditory cortex at 1.5 T using variable duration imaging acoustic noise.

Shuowen Hu1, Olumide Olulade, Javier Gonzalez Castillo

  • 1School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA. hu@ecn.purdue.edu

Neuroimage
|December 2, 2009
PubMed
Summary

Functional magnetic resonance imaging (fMRI) acoustic noise causes nonlinear hemodynamic responses in the auditory cortex, especially for brief sounds. Longer noise durations reveal more linear responses and expanded brain activation patterns.

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Area of Science:

  • Neuroimaging
  • Auditory Neuroscience
  • Biomedical Engineering

Background:

  • Functional magnetic resonance imaging (fMRI) acoustic noise is a significant confound, particularly in auditory studies.
  • This noise originates from gradient switching and radiofrequency transmission during image acquisition.

Purpose of the Study:

  • To characterize hemodynamic responses to actual imaging acoustic noise.
  • To assess the linearity of these responses in the primary auditory cortex based on noise duration.
  • To evaluate the spatial extent of noise-induced brain activity.

Main Methods:

  • Utilized a novel pulse sequence to present controlled imaging acoustic noise.
  • Investigated hemodynamic responses to varying noise durations (46 ms to >1 s).
  • Assessed linearity and spatial extent of activation in the auditory cortex.

Main Results:

  • Responses to brief acoustic noise (46 ms) were highly nonlinear.
  • Responses to longer acoustic noise (>1 s) became approximately linear.
  • The right primary auditory cortex showed greater nonlinearity than the left.
  • Using noise-specific modeled responses improved detection sensitivity for auditory cortex activation.
  • Longer noise durations (1.5 s) expanded activation from Heschl's gyrus to surrounding temporal and insular regions.

Conclusions:

  • Hemodynamic responses to fMRI acoustic noise exhibit duration-dependent linearity.
  • Novel analysis methods enhance the detection of noise-induced brain activity.
  • Imaging acoustic noise can impact higher-level auditory processing by activating broader brain regions.