Longitudinal, Multimodal Tracking Reveals Lasting Neurovascular Impact of Individual Microinfarcts

Area of Science:

• Neuroscience
• Cerebrovascular Research
• Cognitive Neurology

Background:

• Microinfarcts are common in aging and injured brains, linked to cognitive decline.
• The precise neurophysiological effects of microinfarcts are not well understood.
• Understanding microinfarcts is crucial for addressing age-related cognitive impairments.

Purpose of the Study:

• To investigate the neurovascular effects of a single microinfarct.
• To elucidate the impact of microinfarcts on neural activity and brain communication.
• To explore the relationship between vascular changes and neural recovery after microinfarction.

Main Methods:

• Utilized a multimodal chronic neural platform for combined functional microvasculature imaging and neural recording.
• Induced single microinfarcts to study their localized effects.
• Spatially resolved neural recording to assess activity in different cortical layers.

Main Results:

• Microinfarcts caused temporary neural activity suppression with minimal cell death, unlike larger strokes.
• Neural activity recovery correlated with vasculature remodeling at the infarct core.
• Shallower cortical layers showed more severe neural suppression despite less vascular damage compared to deeper layers.
• Disrupted spike phase locking in the low-gamma band indicated impaired long-range neural communication.

Conclusions:

• A single microinfarct induces subtle but significant neurovascular disruptions.
• Microinfarcts can lead to lasting impairments in neural communication.
• The differential impact on cortical layers and neuron types suggests complex neurophysiological consequences.