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Neural phase locking predicts BOLD response in human auditory cortex.

Hiroyuki Oya1, Phillip E Gander1, Christopher I Petkov2

  • 1Department of Neurosurgery, Human Brain Research Laboratory, University of Iowa, Iowa City, IA 52252, USA.

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|December 25, 2017
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Summary
This summary is machine-generated.

Neural responses to natural stimuli include phase-locked and non-phase-locked activity. Both are needed to predict the Blood-Oxygen-Level-Dependent (BOLD) signal, requiring revised biophysical models.

Keywords:
Auditory cortexBOLDBroadband powerGamma bandHumanNeurovascular couplingPhase locking

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neural Oscillations

Background:

  • The Blood-Oxygen-Level-Dependent (BOLD) signal is commonly interpreted via non-phase-locked neural activity, specifically high-frequency local field potentials (LFPs) and spiking activity.
  • Previous research has not investigated the predictive capacity of phase-locked neural responses on the BOLD signal.

Purpose of the Study:

  • To investigate the relationship between phase-locked neural responses and the BOLD signal in the human auditory cortex.
  • To determine if phase-locked activity, in addition to oscillatory power, is necessary for predicting BOLD responses.

Main Methods:

  • Examined the BOLD response and LFPs in nine human subjects at multiple auditory cortex locations.
  • Utilized amplitude-modulated pure tone stimuli designed to isolate sustained phase-locking without onset response contamination.

Main Results:

  • Both phase locking at the modulation frequency (and its harmonics) and gamma/high-gamma band oscillatory power were found to be essential for predicting the BOLD response.
  • Demonstrated that phase-locked neural activity significantly contributes to the BOLD signal.

Conclusions:

  • Biophysical models of BOLD signal generation in the auditory cortex need revision.
  • Future models must incorporate both phase locking to rhythmic sensory input and power changes in ensemble neural activity.