wood response to moisture

[Dave Nereson]

    I'm pretty sure I read in a recent post or Journal article that the 
soundboard can take a lot longer to lose moisture than it did to gain it.

    But then I read in an article by Susan Graham [The Technical Forum, PTG 
Journal, Oct. '88] that "keys stick in wet weather. . . because the hole has 
tightened around the balance rail pin, having clearly gotten smaller as the 
wood has expanded.  The reason for this is the way in which wood takes on 
moisture.  First of all, it takes on moisture three times more slowly than 
it loses it, . . . ."
    That's just the opposite of the what I had heard and read before.  Which 
is it?  Anybody know?