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Author Spotlight: IntelliSleepScorer — A High-Accuracy, Accessible GUI Software for Automated Sleep Stage Scoring in Mice and its Application in Psychiatric Research
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Mapping visual dominance in human sleep.

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Summary
This summary is machine-generated.

Brain hemisphere differences, or asymmetries, are present during sleep. Deeper non-REM sleep shows increasing rightward visual cortex asymmetry, while language areas maintain leftward asymmetry, suggesting sleep state influences brain function.

Keywords:
Global signalHemispheric asymmetryLanguage networkLateralizationSleepVisual network

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Cognitive Neuroscience

Background:

  • Hemispheric lateralization of function is well-documented in various neurological contexts.
  • Previous research established brain asymmetries during wakeful rest using functional magnetic resonance imaging (fMRI).
  • However, whether these brain asymmetries persist during sleep remains largely unexplored.

Purpose of the Study:

  • To investigate the presence and nature of hemispheric asymmetries in the global brain signal during non-rapid eye movement (NREM) sleep.
  • To determine if brain asymmetries observed during wakefulness are maintained or altered during different sleep stages.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) to analyze the blood-oxygen-level-dependent (BOLD) signal.
  • Examined global brain signal fluctuations during non-REM sleep.
  • Quantified hemispheric asymmetries in specific brain regions, including visual cortex, language areas, and attention networks.

Main Results:

  • Increasing sleep depth correlated with a growing rightward asymmetry in visual cortex regions.
  • Left hemisphere language-related areas largely preserved their typical leftward asymmetry during sleep.
  • Attention-related regions in the right hemisphere showed variable asymmetry patterns, with some maintaining rightward bias and others losing it.

Conclusions:

  • Human brain asymmetries are not static but are dependent on the brain's state, such as wakefulness versus sleep.
  • Specific patterns of hemispheric specialization, particularly in visual and language processing, are modulated by sleep depth.
  • These findings contribute to understanding the dynamic nature of brain organization during different physiological states.