Twitching in sleeping premature infants provides a sensitive behavioral assay of early motor control

Area of Science:

• Neuroscience
• Developmental Biology
• Sleep Science

Background:

• Limb twitching is an early developmental behavior and a characteristic of active (rapid eye movement, REM) sleep.
• Previous research has identified spatiotemporal organization in full-term infant twitching.
• Preterm infants have increased sleep time and are at higher risk for neurodevelopmental disorders.

Purpose of the Study:

• To systematically characterize limb twitching in preterm infants at 34-35 weeks postmenstrual age.
• To investigate the spatiotemporal organization and age-related changes in twitching behavior in this population.
• To explore the potential of limb twitching as an indicator of developing neural control of movement.

Main Methods:

• Systematic behavioral assessments of limb twitching in preterm infants.
• Analysis of the spatiotemporal patterns of twitching across the body.
• Observation of twitching during different sleep states, including tracé alternant.

Main Results:

• Preterm infants exhibit a high volume of body-wide twitching, suggesting functional importance.
• The spatiotemporal structure of twitching evolves with age, with a notable increase in finger and toe movements.
• During tracé alternant sleep, twitching was predominantly observed in the legs.

Conclusions:

• Limb twitching in preterm infants is abundant and shows developmental changes.
• Specific patterns of twitching, like leg-only bouts during tracé alternant, offer novel insights.
• Sleep-related limb twitching serves as a sensitive measure for assessing the developing neural control of movement in infants, with implications for typical and atypical neurodevelopment.