Transcranial magnetic stimulation (TMS) is a non-invasive procedure that uses magnetic fields to stimulate nerve cells in the brain to improve symptoms of depression or anxiety. Nolan Williams' lab at Stanford uses TMS to activate the dorsalateral prefrontal cortex.
"The host mentions transcranial magnetic stimulation (TMS) as a method to activate the dorsal prefrontal cortex and improve heart rate variability. While it's mentioned as a treatment, commercial devices may exist, but is not described specifically. Host mentions it may exist in the future."