A hyperencephalogram was a 23rd century medical analysis of brain-wave activity, measured as a brain circuitry pattern, or BCP The BCP was considered a unique characteristic for every individual, akin to fingerprints, making that individual's hyperencephalogram an important part of his or her medical record. An individual's hyperencephalogram could be altered if interfered with by another resident brain-wave activity, such as an invading telepathic or noncorporeal lifeform.

In 2267, Nomad was supplied with tracings of Montgomery Scott's hyperencephalogram in order to assist with its ‘repair' of the engineer after previously killing him. (TOS: "The Changeling")

In 2269, Mira Romaine's hyperencephalogram was altered when she became possessed by invading Zetarians, and her brain circuitry pattern readout was instrumental in diagnosing this. (TOS: "The Lights of Zetar").

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