Summary
In this episode of The Huberman Lab Podcast, Andrew Huberman discusses the nervous system and its various functions. The nervous system is made up of trillions of neurons that communicate with each other through synapses. The language of the nervous system is electricity, and experiences and memories are stored as patterns of electricity in neurons. The nervous system governs all other biological systems of the body and is influenced by them as well. The speaker emphasizes the importance of talking to a healthcare professional before trying any new tools or practices.
The effects of bullet wounds on the nervous system are also discussed, as they have contributed to our understanding of brain regions and functions. The five (or six) main functions of the nervous system are sensation, perception, attention, reflexive action, and deliberate action. The concept of attention is particularly emphasized as something that is under our control and can be improved through rest and deliberate focus. The role of neuromodulators in influencing emotional states is also briefly touched upon.
Neuroplasticity, the ability of the brain to change its connections and the way it works in response to experience, is also discussed. This process can be directed by individuals, and it requires top-down processing and the release of neuromodulators like dopamine, serotonin, and acetylcholine. The release of epinephrine is necessary for alertness and focus, which are required for directing plastic changes to specific parts of the nervous system. However, the dirty secret of neuroplasticity is that all the strengthening of synapses and addition of new nerve cells or connections between nerve cells occurs during sleep and non-sleep deep rest.
Finally, the speaker emphasizes the importance of actions and behaviors in creating a fossil record of our existence. Understanding and mastering the cycles of the autonomic nervous system is key to controlling the nervous system and improving neuroplasticity. Deliberate rest immediately after intense focus can accelerate neuroplasticity, and playing a tone while learning a skill can improve retention and learning rates during deep sleep. Sleep quality, timing, and ultradian rhythms are also important for optimizing the brain's ability to focus and learn.
