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A cortical monitor is like a small tricorder sensor that is attached underneath the ear. It is used to track and record a patient's neural functions. The Doctor used them on Vorik when he was undergoing pon farr, on Tuvok and Captain Janeway when Tuvok begins to suffer a mental breakdown and on Chakotay when he was experiencing hallucinations caused by chaotic space. (VOY: "Blood Fever", "Flashback", "The Fight")