So if I am below the trimmed AoA, (ie motoring along the aerial freeway faster than trim speed) the plane noses up to get (back) there (somewhere near trim speed - within a reasonable tolerance) all by itself if I let go (strictly, if you ease off the stick load gradually). And vice versa. So trimmed for 80 knots in my Cessna and I am zooming along at 100 knots without re-trimming (but holding a pretty decent push stick force as you descend - test normally would be for a fixed thrust setting), then the thing pulls up if I relax the wheel/yoke/stick. U.S. nasal radiators like 'bird are very familiar with this, as it was the way they made their approach to the deck - they trimmed for AoA and used power to control rate of descent.
[My red additions above for additional wordiology confusion].
The current test procedure for FAR 25 is given in the
FTG AC 25-7B starting at page 109.
Similarly, for Part 23, the FTG is at
AC 23-8C starting at page 78. (be warned - 14MB)