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It works by using associative memory. By progressively asking you to think of very common items, you think of very predictable answers. Then the last things that you thought of will come together.
What color are the little elephants that drunks think of - Pink.
What color are flamingoes - Pink.
What color is a strawberry milkshake - Pink.
Think of marshmallows ... and what color do you thinK ?
This is also a good example why witnesses (and people under hypnosis) may not have a good memory of facts - because questions can "color" their answers.'
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The Red Hammer Question - Red Hammer Test - Red HammerThe Red Hammer Test can seem like an uncanny test. How does it work? You are given a series of simple arithmetic questions get you into the mode of doing a simple calculation, accessing that part of your brain. The questions get progressively harder (but still pretty easy), except the last sum, which is slightly easier. They also tell you "almost done, just a couple more questions" to get you to anticipate the ending.
Then finally the important question, "Think of a color and a tool." This causes you to access a different part of your brain which has to make some quick associations.
When asked to think of a color, most people will say "red" first, and when asked to think of a tool will think of a "hammer" first – “Red hammer”.
The "test" then finishes by telling you that 98% of people will say "red hammer". (It is also true that 47% of stats are made up). However do test it on one of your friends and see what the results are. More often than not the will say Red Hammer but make sure they don’t know about the “Red Hammer Test” / “Red Hammer Question”.
My humble opinion is quite simple: Hammer is the most prime tool we can think of. Arguable the first tool humans ever used. Red is the most primary bold color which is associated with love, hate, anger and danger so it is no wonder that we think of it first.