Project Implicit.

[Doc]

I noticed the same thing regarding my handedness.  During the young/old test the easiest sorting factor for me was "right finger bad, left finger good."  I am left handed.  Things I grab with my left hand are better, at a subconcious level, because I can use them more effectively.  I scored no prejudice toward the young or old.
While testing I noticed my mind sorting things in a two step process.  First: word or picture.  Then young/old or good/bad as appropriate.

These are sorting drills, not psycological examinations.  They test the logic and sorting function of your brain - not the true emotional response to images.

I found myself comparing this test to the coding drills on the ASVAB.  The coding drills were a more effective study of the mind.  It could have tested my prejudice toward young and old people better by asking me "Would you want to talk to this person?" and giving me a 1-10 scale every time a picture popped up.

The most effective test I've seen for gut reaction emotional responses is the test where you have pictures of folks holding everyday items and weapons.  In poorly lit conditions or, for many participants, if the subject was African-American more people thought everyday objects were threatening weapons.
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Try to kill somebody often enough and they develop this strange aversion to anything that might be a weapon. Go figure!