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Acquisition of Resting-State Functional Magnetic Resonance Imaging Data in the Rat
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Similarities and differences between intermittent and continuous resting-state fMRI.

Justyna Beresniewicz1, Frank Riemer2, Katarzyna Kazimierczak1,2

  • 1Department of Biological and Medical Psychology, University of Bergen, Bergen, Norway.

Frontiers in Human Neuroscience
|August 21, 2023
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Summary
This summary is machine-generated.

Intermittent resting periods in functional magnetic resonance imaging (fMRI) show similar brain activity to continuous resting, but with notable differences in the Default Mode Network (DMN) and its interactions with other networks.

Keywords:
Default Mode Network (DMN)block designcognitive tasksfunctional Magnetic Resonance Imaging (fMRI)resting state

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Functional Magnetic Resonance Imaging (fMRI) block designs use ON-blocks (tasks) and OFF-blocks (rest).
  • OFF-blocks may represent intermittent resting states, but their similarity to continuous resting states is unknown.
  • The Default Mode Network (DMN) is a key network studied during continuous rest.

Purpose of the Study:

  • To investigate similarities and differences in brain activity between intermittent and continuous resting conditions using fMRI.
  • To compare brain activity patterns during OFF-blocks with those during dedicated continuous resting periods.

Main Methods:

  • fMRI data acquired from 47 healthy participants.
  • Intermittent resting-state data from OFF-blocks within an ON-OFF block design.
  • Continuous resting-state data acquired during a 5-minute period post-task.

Main Results:

  • Overall brain activity was similar between intermittent and continuous resting states.
  • Differences observed within the DMN and its network interactions.
  • Reduced overlap in medial prefrontal cortex (MPFC) DMN maps for intermittent rest.
  • Stronger DMN connectivity with the salience network (SN) during intermittent rest.

Conclusions:

  • Intermittent and continuous resting states exhibit both similarities and differences in brain activity.
  • Observed differences may stem from task carry-over effects in intermittent resting periods.
  • Further research is required to fully elucidate the distinctions between these resting conditions.