1. Scientists used to think vagal tone was largely stable, like your height in adulthood.
A.To appreciate why this matters, here’s a quick anatomy lesson.
B.Subtle variations in your heart rate reveal the strength of this brain-heart connection, and as such, heart-rate variability provides an index of your vagal tone.
C.Your brain is tied to your heart by your vagus nerve.
D.Our data show that this part of you is plastic, too, and altered by your social habits.
6. By and large, the higher your vagal tone the better.