Neuromodulation in the developing visual cortex after long-term monocular deprivation

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Visual System Research

Background:

• Neural dynamics in the primary visual cortex (V1) are altered by critical period monocular deprivation (MD).
• Previous research highlights chronic disruptions in V1 function (e.g., ocular dominance, acuity) after long-term monocular deprivation (LTMD).
• Neuromodulation and neural synchrony alterations following LTMD remain less explored.

Purpose of the Study:

• To investigate age-dependent differences in experience-dependent plasticity following LTMD.
• To examine intracellular calcium signals and local field potential (LFP) alterations in juvenile versus adult mice.
• To explore changes in brain oscillation power bands and phase-amplitude coupling (PAC) after LTMD.

Main Methods:

• Utilized intracellular calcium imaging with fluorescent indicators to assess neuromodulatory changes.
• Recorded local field potentials to analyze power spectrum of brain oscillations.
• Quantified phase-amplitude coupling (PAC) to understand neural synchrony alterations.

Main Results:

• Juvenile mice subjected to LTMD exhibited greater neuromodulatory changes in the non-deprived eye (NDE).
• Adult mice subjected to LTMD showed a more pronounced response in the deprived eye (DE).
• LTMD in juveniles altered delta, theta, and gamma oscillation power, enhancing delta-gamma PAC in the NDE; adult LTMD altered delta power and enhanced delta-gamma PAC in the DE.

Conclusions:

• LTMD induces distinct age-dependent neuromodulatory and neural synchrony alterations in the primary visual cortex.
• Juvenile plasticity is characterized by NDE-dominant changes, while adult plasticity shows DE-dominant responses.
• Observed oscillatory and PAC markers are intrinsic to cortical processing and relevant across various nested oscillatory patterns during LTMD.