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Hand posture affects brain-function measures associated with listening to speech.

Koichi Tsunoda1, Mihiro Takazawa2, Sotaro Sekimoto2

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Ensuring brain study reliability is crucial. Stable hand posture during near-infrared spectroscopy (NIRS) hearing tasks significantly enhances result reproducibility, unlike crossed postures.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biomedical Engineering

Background:

  • Reproducibility is a significant challenge in neuroimaging studies, including functional magnetic resonance imaging (f-MRI), near-infrared spectroscopy (NIRS), and positron-emission tomography (PET).
  • Replication efforts in psychological studies indicate low success rates, highlighting the need to identify factors affecting reliability.
  • Previous research suggests that changes in hand/arm posture may confound task-related brain activity measurements.

Purpose of the Study:

  • To identify and mitigate factors that reduce the reliability of neuroimaging results.
  • To demonstrate a method for enhancing reproducibility in near-infrared spectroscopy (NIRS) studies.
  • To investigate the specific impact of hand posture on brain activity during a hearing task.

Main Methods:

  • Utilized near-infrared spectroscopy (NIRS) to measure brain activity during a hearing task.
  • Compared brain activity and functional connectivity patterns between participants in stable parallel hand posture and crossed hand posture.
  • Controlled for task conditions, specifically listening to speech stimuli.

Main Results:

  • Significant differences in asymmetric functional connectivity were observed between parallel and crossed hand postures, particularly during non-resting states.
  • Crossed hand posture led to different results compared to parallel posture in the NIRS hearing task.
  • Stable posture, with hands on a surface and feet on the floor, is critical for consistent outcomes.

Conclusions:

  • Stable hand posture is a critical factor for improving the reliability and reproducibility of NIRS studies.
  • Standardizing participant posture, even for simple tasks like listening, is essential for accurate and repeatable neuroimaging results.
  • Implementing posture control can enhance the validity of findings in brain activity research.