Sleep as a window on the sensorimotor foundations of the developing hippocampus

Area of Science:

• Neuroscience
• Developmental Biology
• Cognitive Science

Background:

• The hippocampal formation is traditionally linked to learning and memory.
• Emerging evidence suggests its role in integrating sensory feedback from self-generated movements for motor control.
• This supports the view of the hippocampus as a crucial site for sensorimotor integration.

Purpose of the Study:

• To review neurophysiological evidence supporting a sensorimotor foundation for hippocampal function, particularly in early development.
• To explore the role of active (REM) sleep in establishing hippocampal functional connectivity.

Main Methods:

• Review of existing neurophysiological studies in developing rats.
• Analysis of evidence linking hippocampal function to sensorimotor processing.
• Examination of the temporal relationship between hippocampal network development and sleep states.

Main Results:

• Hippocampal function is fundamentally built on a sensorimotor basis, especially evident during early developmental stages.
• Functional connectivity between the hippocampus and distant sensory/motor structures is preferentially established during active (REM) sleep.
• This connectivity emerges when the hippocampus is first developing its network.

Conclusions:

• Sleep, particularly REM sleep, is vital for sensorimotor development in early infancy.
• This critical context supports the development of the hippocampus and its associated neural networks.
• The hippocampus serves as a key hub for sensorimotor integration, with development deeply intertwined with sleep and motor activity.