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Developmental changes in cortical sensory processing during wakefulness and sleep.

Gentaro Taga1, Hama Watanabe1, Fumitaka Homae2

  • 1Graduate School of Education, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.

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|June 4, 2018
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Summary
This summary is machine-generated.

Infant brain processing of sounds and sights differs significantly between sleep and wakefulness. Auditory processing remains global during sleep, while visual processing develops inhibitory mechanisms.

Keywords:
Functional connectivityHemodynamic responseInfantNIRSSleephPod

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cognitive Neuroscience

Background:

  • Infants process auditory and visual information during both sleep and wakefulness.
  • Limited understanding exists regarding cortical sensory processing differences across infant behavioral states.

Purpose of the Study:

  • To investigate cortical hemodynamic responses to auditory and visual stimuli in infants during wakefulness and sleep.
  • To explore developmental changes in sensory processing and functional connectivity in infants.

Main Methods:

  • Utilized functional near-infrared spectroscopy (fNIRS) to measure cortical hemodynamic responses in infants aged 2-10 months.
  • Presented asynchronous auditory and visual stimuli during both wakefulness and sleep states.

Main Results:

  • During wakefulness, stimuli evoked focal responses in sensory cortices.
  • During sleep, auditory stimuli induced global responses, while visual stimuli showed developmental changes from activation to deactivation.
  • Functional connectivity was higher during sleep than wakefulness, with developmental changes observed in hemoglobin oxygenation/deoxygenation (hPod) and phase locking index (hPodL).

Conclusions:

  • Behavioral state fundamentally impacts infant cortical sensory processing.
  • Wakeful processing is localized, auditory processing is active in both states, and visual processing develops inhibitory mechanisms during sleep.
  • Observed phenomena reflect neural development more than vascular/metabolic development.