A word about perfect pitch

A word about perfect pitch/developing perfect pitch:
On wikipedia's "absolute pitch" page, you will see a subsection in bold saying AP is a "Difference in cognition, not elementary sensation." I don't think this is true. AP has both a physical element and a cognitive element. I don't know what instruments of observations the physicians cited on the site were using but it may be that the physical changes that will take place in your ear are too miniscule/subtle to detect with those that were used. In my experience, a bit after I began training, my ear started to get a sensation similar to that of when the ear drum sort of pops in and out at high and low altitudes. For me the sensation that the ear is "opening up" is genuinely physical. . The more your ear opens up, the clearer you will perceive the particular qualities of each note. As you can imagine, you have to be pretty gentle with this and allow it to be a very gradual process. Burge recommends a maximum of 45 minutes of ear training at a time, and that seems to be pretty good - the longest I've gone is about 50 minutes. He has listeners start out at about 20 minutes though and I think that is a good idea - to work your way up to more time over time. It might be about 3 weeks to a month before you start getting an "opening up" sensation, it might take less time or more time though. As I will mention again, this means the training is working and your ear is developing. Burge doesn't explicitly mention anything about this physical sensation, although he alludes to it a few times - in the written part of the program he says "the ear will open like a flower". Might sound a bit cheesy, but that's basically what seems to happen. If you experience some discomfort in your ears, you may want to refrain from training, but remember that it could be a positive sign that your ear is improving - just remember to kind of take it easy and that the ear opens only a little at a time.