The Autonomic Nervous System
Two modes, one nervous system
Your autonomic nervous system has two branches: sympathetic (gas pedal) and parasympathetic (brake). Modern life keeps most people stuck with the gas pedal floored.
The vagus nerve: your calm switch
The vagus nerve is the main parasympathetic highway. It runs from your brainstem to your gut, controlling heart rate, digestion, and inflammation. Higher vagal tone = faster stress recovery.
Match the branch
Match each response to its nervous system branch.
This step is interactive — open the Thier app to try it.
Explore vagal tone
Tap each method to boost vagal tone.
This step is interactive — open the Thier app to try it.
True or False
You can't consciously control your autonomic nervous system.
This step is interactive — open the Thier app to try it.
Key Takeaway
Your breath is the remote control for your nervous system. Learning to shift from sympathetic to parasympathetic at will is the most powerful stress management skill.