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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychology

Background:

  • Functional MRI (fMRI) is a key tool for studying brain activity.
  • Scanner noise is a known confound in fMRI research.
  • The impact of scanner noise on affective processing remains unclear.

Purpose of the Study:

  • To investigate interaction effects between fMRI scanner noise and neural processes underlying emotion perception.
  • To determine how different scanning modes (continuous vs. sparse) influence brain responses to emotional stimuli.

Main Methods:

  • Participants (N=34) were divided into continuous and sparse scanning groups.
  • Stimuli included music pieces expressing fear, neutral, and joy emotions.
  • fMRI BOLD signals were analyzed for interactions between scanning noise levels and emotional content.

Main Results:

  • Significant interactions were found in auditory cortex, insula, and visual cortex.
  • Sparse scanning showed stronger BOLD signals for joy > fear and fear > neutral in auditory cortex.
  • Continuous scanning showed stronger BOLD signals for joy > neutral (left auditory cortex) and joy > fear (calcarine sulcus).

Conclusions:

  • This is the first study to demonstrate a statistical interaction between fMRI scanner noise and affective brain processes.
  • Scanner noise can significantly affect and distort neural responses related to emotional stimuli.
  • Findings highlight the importance of considering scanner noise in fMRI studies of emotion.