Imaging visual cortical structure and function in vivo.

Area of Science:

• Neuroscience
• Developmental Biology
• Microscopy

Background:

• Dendritic spines are crucial postsynaptic sites for excitatory synapses in the central nervous system (CNS).
• In vivo two-photon microscopy enables repeat imaging of cortical structures at high resolution in intact brains.
• Rapid remodeling of dendritic spines occurs in response to visual environment changes.

Purpose of the Study:

• To investigate the link between structural plasticity of dendritic spines and functional visual cortical responses.
• To examine the effects of monocular deprivation during a critical developmental period on dendritic spines and visual responses.
• To assess the reversibility of structural and functional changes following eye reopening.

Main Methods:

• Combined in vivo two-photon microscopy of dendritic segments with intrinsic signal imaging.
• Utilized the developing ferret visual cortex model.
• Implemented a monocular deprivation paradigm followed by a recovery period.

Main Results:

• Monocular deprivation during the critical period rapidly altered both dendritic spine density and visual responses to the deprived eye.
• Reopening the deprived eye led to a swift return to pre-deprivation levels for both dendritic spine density and visual responses.
• Demonstrated a direct correlation between structural remodeling of dendritic spines and functional plasticity in the visual cortex.

Conclusions:

• Structural and functional changes in the visual cortex are tightly linked and occur rapidly during development.
• In vivo two-photon microscopy is a powerful tool for studying dynamic structural and functional plasticity in the CNS.
• The observed changes are reversible, highlighting the dynamic nature of neural circuits during critical developmental periods.