Locus coeruleus-norepinephrine modulation of sensory processing and perception: A focused review

Area of Science:

• Neuroscience
• Neurobiology

Background:

• The locus coeruleus-norepinephrine (LC-NE) system plays a crucial role in various brain functions.
• Dysregulation of the LC-NE system is implicated in numerous neurological disorders.

Purpose of the Study:

• To review the impact of LC-NE signaling on sensory neuron activity in cortical and subcortical regions.
• To examine how LC-NE influences perception-driven behaviors across mammalian sensory systems (somatosensory, visual, auditory, olfactory).
• To propose a unifying framework for understanding LC-NE effects.

Main Methods:

• Literature review and synthesis of existing research findings.
• Analysis of studies investigating LC-NE signaling in different sensory modalities.
• Examination of adrenergic receptor expression, dose-dependent effects, and excitation-inhibition balance.

Main Results:

• LC-NE signaling influences sensory neuron activity across diverse brain areas and sensory systems.
• Observed effects of LC-NE can appear inconsistent, necessitating a nuanced understanding.
• A framework based on receptor expression, dosage, and neural balance helps reconcile findings.

Conclusions:

• LC-NE system's complex role in sensory processing and behavior is highlighted.
• A proposed framework offers insights into the variability of LC-NE effects.
• Future research directions for understanding LC-NE system functions are discussed.