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Related Experiment Video

Updated: May 17, 2025

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Time-dependent scale-free brain dynamics during naturalistic inputs.

Philipp Klar1, Yasir Çatal2, Gerhard Jocham3

  • 1Faculty of Mathematics and Natural Sciences, Institute of Experimental Psychology, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany; Institute of Neuroscience and Medicine, Brain & Behaviour (INM-7), Research Centre Jülich, Jülich, Germany.

Neuroimage
|May 10, 2025
PubMed
Summary
This summary is machine-generated.

The brain

Keywords:
Fractal dynamicsISCInter-subject correlationScale-free dynamicsSpectral exponent

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Area of Science:

  • Neuroscience
  • Physics
  • Signal Processing

Background:

  • Environmental processes, including sensory inputs, often exhibit power-law distributions.
  • The brain's scale-free dynamics and their response to naturalistic stimuli, particularly the spectral exponent (β(t)), are not fully understood.
  • Investigating how the brain dynamically adapts its spectral exponent to changing inputs is crucial for understanding neural processing.

Purpose of the Study:

  • To investigate the dynamic, time-dependent spectral exponent (β(t)) in the brain during naturalistic audiovisual input (movie-watching).
  • To examine the relationship between the brain's dynamic spectral exponent (β(t)) and inter-subject correlation (ISC(t)) in early sensory regions.
  • To determine how the brain's shift from intrinsic to stimulus-driven scale-free dynamics modulates shared brain activity.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Time-varying inter-subject correlation (ISC(t)) was calculated to assess shared brain activity.
  • The time-dependent spectral exponent (β(t)) was analyzed in visual and auditory regions during rest and movie-watching using the 7 Tesla Human Connectome Project dataset.

Main Results:

  • The brain's spectral exponent (β(t)) demonstrated distinct temporal structures in sensory regions during naturalistic input compared to rest.
  • A positive correlation was found between the time-dependent spectral exponent (β(t)) and inter-subject correlation (ISC(t)) during movie-watching.
  • Subject groups, differentiated by the change in β(t) from rest to movie-watching, showed varying β(t)-ISC(t) correlations, indicating modulation of shared brain activity by scale-free dynamics.

Conclusions:

  • The brain exhibits dynamic, time-dependent scale-free dynamics during naturalistic audiovisual input.
  • There is a positive relationship between the brain's time-dependent spectral exponent (β(t)) and inter-subject correlation (ISC(t)), suggesting higher exponents correlate with greater shared brain activity.
  • The brain's adaptation of its scale-free dynamics in response to stimuli influences the degree to which sensory inputs are imprinted on neural activity.