The example of the hum is demonstrated at the timestamp 1:44:22. The speaker describes the technique and then provides an auditory example.
This video explores the vagus nerve (cranial nerve 10), its extensive pathways linking the brain and body, and actionable tools to influence its functions. The main purpose is to provide science-based methods for improving mood, alertness, and neuroplasticity by understanding and controlling vagal nerve activity.
The vagus nerve is a bidirectional superhighway: It carries both sensory (afferent) and motor (efferent) information, unlike most cranial nerves. Sensory information includes chemical and mechanical data from organs, while motor outputs control organ function.
Vagus nerve activity influences alertness and calm: While often associated with calming, it also plays a crucial role in alertness. Specific pathways within the vagus nerve can either increase or decrease alertness, depending on activation.
Actionable tools to modulate vagus nerve activity: The video details techniques like extended exhales, physiological sighs (two inhales followed by a long exhale), neck stretches, and humming to influence vagal activity and improve heart rate variability (HRV).
Exercise's impact on the vagus nerve and neuroplasticity: High-intensity exercise triggers adrenaline release, activating vagal pathways and enhancing brain alertness, focus, and neuroplasticity. This effect is mediated by glutamate and norepinephrine release.
Gut-brain connection via the vagus nerve: The vagus nerve coordinates serotonin levels in the gut and brain. Improving gut health through fermented foods and tryptophan-rich diets can positively impact mood and brain serotonin levels.
