A 48 year old man comes into the ER after a motorcycle accid…

A 48 year old man comes into the ER after a motorcycle accident. The patient was not wearing a helmet and was thrown 30 feet onto pavement. While assessing him, you note an unusual respiratory pattern. He breathes 30 times a minute, then his respirations slow and he has several seconds of apnea, before he begins breathing again. This pattern is consistent with: