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Are inter-subject functional correlations consistent across different movies?

Mengting Ye1,2, Jiangcong Liu1, Yun Guan1

  • 1School of Computer and Information Technology, Beijing Jiaotong University, 100044, Beijing, China.

Brain Imaging and Behavior
|November 23, 2022
PubMed
Summary

Inter-subject functional correlation (ISFC) in movie fMRI is movie-specific. This brain imaging analysis shows low consistency across different movies, limiting its generalizability for predictive models.

Keywords:
Human connectome project (HCP)Inter-subject functional correlation (ISFC)Intra-class correlation (ICC)Movie fMRIPrediction

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Area of Science:

  • Neuroscience
  • Functional Magnetic Resonance Imaging (fMRI)
  • Brain Connectivity

Background:

  • Movie fMRI is increasingly utilized for human brain function studies.
  • Inter-subject functional correlation (ISFC) measures stimulus-dependent synchrony between brains.
  • ISFC is a key analysis for movie fMRI data, but its consistency across different stimuli is unknown.

Purpose of the Study:

  • To evaluate the consistency of ISFC across different movies.
  • To assess the generalizability of ISFC-based predictive models.
  • To inform the application of ISFC in future naturalistic neuroimaging studies.

Main Methods:

  • Utilized movie fMRI data from 178 subjects in the HCP S1200 Release.
  • Calculated ISFCs across the whole brain for four movie fMRI runs.
  • Assessed ISFC consistency using intra-class correlation (ICC) and evaluated predictive model generalizability (sex classification, grip strength prediction).

Main Results:

  • ISFC intensity was generally weak (mean 0.047).
  • ISFC consistency across movies was low (mean ICC 0.130), with few exceptions within specific brain networks.
  • Predictive models showed significantly lower accuracy for inter-run predictions compared to intra-run predictions, indicating poor generalizability.

Conclusions:

  • ISFC analyses capture brain function aspects that are specific to individual movies.
  • The low consistency and generalizability of ISFC suggest that movie-specific effects are substantial.
  • Researchers should consider this movie specificity when interpreting ISFC findings and designing future naturalistic studies.