Table 2.

Frequency bandwidth intervals with their associated physiology.^35–38,67

Frequency interval	Frequency range (Hz)	Associated physiology
I	0.6 to 2	Cardiac activity
II	0.15 to 0.6	Respiratory activity
III	0.05 to 0.15	Myogenic smooth muscle activity
IV	0.02 to 0.05	Neurovascular coupling and autonomic control in the cortex
V	0.005 to 0.02	Nitric oxide-related endothelial metabolic activity