Visual stimulation drives retinotopic acetylcholine release in the mouse visual cortex.

Area of Science:

• Neuroscience
• Sensory processing
• Cortical circuits

Background:

• Cholinergic signaling regulates key brain functions like memory and attention.
• The precise spatiotemporal release of acetylcholine in the neocortex is not well understood.
• Previous studies suggested diffuse acetylcholine release due to a lack of topographic organization in basal forebrain projections.

Approach:

• Utilized mesoscopic imaging with fluorescent acetylcholine sensors.
• Investigated acetylcholine release patterns in the mouse primary visual cortex.
• Examined responses to visual stimulation.

Key Points:

• Visual stimulation elicits acetylcholine release in the primary visual cortex.
• Acetylcholine release patterns precisely map to the retinotopic organization of visual space.
• This demonstrates a topographic organization previously not recognized in cortical cholinergic signaling.

Conclusions:

• Cholinergic signaling in the neocortex is not uniformly diffuse.
• Acetylcholine release can be topographically organized and functionally specific.
• These findings suggest novel modes of cholinergic modulation in cortical circuits.