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Related Experiment Video

Updated: Jun 14, 2025

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White matter structural bases for phase accuracy during tapping synchronization.

Pamela Garcia-Saldivar1, Cynthia de León1, Felipe A Mendez Salcido1

  • 1Institute of Neurobiology, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, Mexico.

Elife
|September 4, 2024
PubMed
Summary
This summary is machine-generated.

White matter structure in the audiomotor system influences rhythmic tapping abilities. Specific fiber densities, particularly U-fibers and the corpus callosum, correlate with auditory synchronization accuracy and preferred tapping tempos.

Keywords:
audiomotor systemcomputational biologycorpus callosumhumanneurosciencesuperficial white mattersystems biologytap synchronization

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Area of Science:

  • Neuroscience
  • White Matter Microstructure
  • Human Motor Control

Background:

  • Rhythmic entrainment, the ability to synchronize movements to external stimuli, is crucial for motor control.
  • White matter (WM) integrity, encompassing superficial (SWM) and deep (DWM) tracts, underpins neural communication.
  • Understanding the relationship between WM structure and rhythmic synchronization abilities is an emerging area of research.

Purpose of the Study:

  • To investigate the association between white matter properties and rhythmic entrainment abilities during a synchronization-continuation tapping task (SCT).
  • To explore the role of superficial U-fibers and deep white matter tracts, including the corpus callosum (CC), in auditory and visual synchronization.
  • To identify specific white matter microstructural correlates of phase accuracy and preferred tapping tempos.

Main Methods:

  • Diffusion-weighted imaging (DWI) was used to assess macro- and microstructural properties of white matter in 32 human subjects.
  • Subjects performed the SCT task with auditory or visual metronomes at various tempos (550–950 ms).
  • A novel method was employed to quantify the density of short-range U-fibers interconnecting cortical regions.

Main Results:

  • Individual differences in U-fiber density within the right audiomotor system correlated with phase accuracy during auditory synchronization, particularly around 1.5 Hz.
  • Phase accuracy was also associated with the density and bundle diameter of the corpus callosum (CC).
  • The CC showed an interval-selective topography, with anterior regions linked to shorter intervals and posterior regions to longer intervals.

Conclusions:

  • Structural properties of both superficial and deep white matter in the audiomotor system are critical for rhythmic tapping synchronization.
  • Cortical U-fiber density is linked to an individual's preferred tapping tempo and synchronization precision.
  • The corpus callosum's structural characteristics contribute to interval selectivity in rhythmic synchronization tasks.