Disrupted Visual Cortex Neurophysiology Following Very Preterm Birth

Area of Science:

• Neuroscience
• Developmental Biology
• Pediatrics

Background:

• Very preterm (VPT) birth can disrupt the typical maturation of visual brain regions, particularly the occipital cortices.
• This disruption may lead to mild visual impairments observed in VPT children throughout development.
• Neural oscillations are key indicators of brain function, involved in refining neural connections and information processing.

Purpose of the Study:

• To investigate regional oscillatory patterns and functional connectivity in the brains of very preterm (VPT) and full-term children.
• To determine if VPT birth is associated with altered neural oscillations and connectivity in the visual cortex.
• To explore the neurophysiological underpinnings of visual impairments in VPT children.

Main Methods:

• Magnetoencephalography (MEG) was used to record resting-state brain activity.
• Eyes-open data were collected for five minutes from 27 VPT children and 32 full-term control children at 8 years of age.
• Analysis focused on regional oscillatory power and functional coupling (connectivity) in the theta and alpha frequency bands.

Main Results:

• VPT children exhibited significantly elevated theta-band power compared to full-term controls, indicating spectral slowing.
• Alpha amplitude envelope coupling, a measure of functional connectivity, was decreased in VPT children.
• These findings support the hypothesis of altered neural oscillatory patterns in VPT individuals.

Conclusions:

• The results suggest that very preterm birth disrupts the typical developmental trajectory of visual neurophysiology.
• The observed spectral slowing and reduced connectivity in VPT children are linked to difficulties in visual perceptual processing.
• These neurophysiological deficits likely contribute to the visual impairments experienced by VPT individuals throughout childhood and beyond.