In humans, arousal is regulated by the autonomic nervous system. The first four letters, A-U-T-O, tell us it is expected to work automatically. This system has two parts: a part that up-regulates us ...

In humans, arousal is regulated by the autonomic nervous system. The first four letters, A-U-T-O, tell us it is expected to work automatically. This system has two parts: a part that up-regulates us ...

At the center of Pulsetto’s technology is the vagus nerve, the longest cranial nerve in the body and a critical component of the parasympathetic nervous system—often referred to as the body’s “rest ...

Here's What To Do Instead . On the last day of the year, many of us pretend the calendar is a clean slate. New page. New ...