Subconscious absolute pitch as a general trait
Before 2000 it was unknown that a precognitive version of absolute pitch is general in humans. This ability is subconsciously applied in speech and it can be considered as a further means of speaker identification, in addition to voice timbre.
Application of the precognitive, absolute pitch-memory increases with speech emphasis. This is neuroanatomically plausible, because the major precognitive command center for speech (in the anterior cingulate cortex) is not only linked to a pitch memory but also to centers for arousal and emotion.
The motivation dependent use of the absolute pitch-memory can be assumed
as one of the evolutionary foundations of song, and thus of music in
Braun, M. (2001) Speech mirrors norm-tones: Absolute pitch as a normal but precognitive trait. Acoust. Res. Lett. Online 2, 8590. Abstract plus hyperlinked references, Full text (PDF, 75 kB), Nature Science Update, Wissenschaft Online, SPIEGEL ONLINE, ORF ON Science, NRC Handelsblad - Rotterdam
Recent results from colleagues: Anatomical
brain deficits in possessors of absolute pitch