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A response-locking protocol to boost sensitivity for fMRI-based neurochronometry.

Shivakumar Viswanathan1, Rouhollah O Abdollahi1, Bin A Wang1

  • 1Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany.

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|May 10, 2020
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Summary
This summary is machine-generated.

A new response-locking protocol for functional magnetic resonance imaging (fMRI) helps untangle brain activity timing. This method reveals distinct neural sub-networks involved in perceptual decision-making, improving fMRI

Keywords:
cognitiondecision makingfMRImovementneurophysiologyreaction time

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Imaging

Background:

  • Understanding the precise timing of neural activity relative to behavior is key for decoding cognitive processes.
  • Functional magnetic resonance imaging (fMRI) measures neural activity indirectly through hemodynamics, which have inherent temporal distortions.
  • These distortions complicate the interpretation of behavior-linked neural timing, especially in tasks involving response initiation.

Purpose of the Study:

  • To introduce and validate a novel behavioral protocol designed to disentangle Blood-Oxygen-Level-Dependent (BOLD) signal dynamics before and after a behavioral response.
  • To assess the utility of this response-locking protocol in a perceptual decision-making task.
  • To investigate the temporal dynamics of neural activity within prefrontal and insular cortices during decision-making.

Main Methods:

  • Development of a novel response-locking behavioral protocol for fMRI studies.
  • Application of the protocol during a random dot perceptual decision-making task.
  • Analysis of BOLD signal changes in relation to behavioral responses, focusing on pre- and post-response periods.

Main Results:

  • Increasing perceptual difficulty led to expected widespread activity increases in the lateral/medial prefrontal cortex and anterior insula.
  • Response-locking revealed functional dissociation: pre-supplementary motor area (preSMA) and anterior premotor cortex (prePMV) showed post-response modulations, unlike the anterior insula and anterior cingulate cortex.
  • Distinct temporal profiles of post-response BOLD activity were observed: preSMA showed timing modulation, while prePMV showed amplitude modulation, indicating functionally distinct sub-networks.

Conclusions:

  • The novel response-locking protocol successfully disentangled pre- and post-response neural activity, revealing functional dissociations within a distributed network.
  • This method highlights distinct sub-networks within the prefrontal cortex based on their temporal response characteristics.
  • The response-locking protocol enhances the sensitivity of fMRI for investigating timing-related neural processes in cognitive tasks.