Rapid eye movement sleep promotes cortical plasticity in the developing brain.

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Sleep Research

Background:

• Rapid eye movement sleep (REM sleep) is abundant in early life.
• The precise function of REM sleep in the developing brain remains unclear.
• Developmental plasticity, such as ocular dominance plasticity, is critical for sensory system maturation.

Purpose of the Study:

• To investigate the role of REM sleep in a model of developmental plasticity.
• To determine if REM sleep influences molecular mechanisms underlying plasticity.

Main Methods:

• Monocular deprivation was used to induce ocular dominance plasticity in cats.
• Rapid eye movement sleep was prevented post-deprivation.
• Single-neuron recordings and molecular analysis (extracellular signal-regulated kinase activation) were performed.

Main Results:

• Preventing REM sleep significantly reduced ocular dominance plasticity.
• Inhibition of REM sleep also decreased the activation of extracellular signal-regulated kinase (ERK), a key plasticity-related kinase.
• Cortical activity during REM sleep mirrored patterns observed during monocular deprivation, correlating with maximal ERK activation.

Conclusions:

• Rapid eye movement sleep plays a vital role in consolidating waking experiences during brain development.
• REM sleep facilitates molecular and network adaptations necessary for learning and plasticity.
• These findings highlight REM sleep's importance for establishing neural circuits in early life.