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Re: AP and age

Hi Jonathan,

Thank you for the lead. In fact, I vaguely remember having heard Mike tell
me about this study. But the genetic link still gives no answer to the
upward shift of AP, even if one would postulate a gene alteration as one
gets older -- a red herring IMHO. So, the question remains: is the basilar
membrane stiffening a sufficient explanation? To me it isn't because then
there would be a differential shift depending on the frequency region of
the stimulus (if I am not mistaken, the base of the BM stiffens more than
the apex), a phenomenon of which I am not aware. In fact, the pitch of a
low-frequency pure tone has shifted upwards for me as much as that of a
complex tone without low-frequency components.


On 12/1/12 7:42 AM, "Jonathan Berger" <brg@xxxxxxxxxxxxxxxxxx> wrote:

>Hi Pierre -
>I hope all is well -
>I saw your post on the auditory list. There's an ongoing study at UCSF on
>AP ( 
>http://perfectpitch.ucsf.edu/study/ ) in which changes with age is one of
>the factors 
>being examined. 
>Mik Merzenich and others  (all from the UCSF group, I believe) published
>the attached 
>paper in 2007.
>No real answers - but a start -
>Hope this helps -
>Best -
>Jonathan Berger
>The Denning Family Provostial Professor
>Stanford University