Brain wave pattern
A brain wave pattern or brain circuitry pattern (BCP) was a readout of a patient's hyperencephalogram, exhibited on a viewscreen as different linear changes of the subject's brain activity. 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. 

While monitoring the sedated  and Hoshi Sato, Doctor Phlox observed them talking and moving about. Although at the time he did not know they were being inhabited by two Organian observers, he was able to record their brain wave patterns and discovered that they were not Human. When he attempted to report the impossibility to Captain Jonathan Archer and T'Pol, he discovered they were then inhabited by the Organians, who noted that Phlox' discovery must have been accomplished with Denobulan technology. ()

In 2269, BCPs of Lieutenant Mira Romaine and the Zetarians were identical. ()

In 2374, The Doctor compared the brain wave pattern of several crewmembers from aboard the  and told Commander Chakotay that they were dreaming all the same dream. ()

See also 
 Brain wave activity
 Neural pattern

External link 
 
Physiology