…these results indicate that, in principle, AP can be learned – or one should rather say, developed or activated.
In 2000, Ernst Terhardt published research on absolute pitch that proves absolute pitch can be learned.
…the ability to recognize absolute pitch was found in a number of birds, and a frog. This indicates that AP is an elementary, rather than sophisticated, feature of the auditory system of vertebrates.
To become a “genuine” AP possessor you must early in life become aware that you already are an AP possessor, and this kind of awareness, of course, may emerge from the experience that pitches can be identified, though at first imperfectly, to a certain higher-than-chance extent.