Romans, I think you're missing the piont. Subliminal messages aren't supposed to be conscious noticed, just as a stimuli.
When psychologists say that stimuli have a subconscious effect on you, they don't mean that you don't consciously notice the stimuli. The mean that you don't consciously notice it forming associations in your head.
For example, look at the typical beer commercial. A typical beer commercial has 3 ingredients:
- Hot chicks
- Guys having fun, partying
Thousands of repetitions of this basic motif in thousands of beer commercials have created a Pavlovian association in your mind, so that you subconsciously associate beer with partying, having fun, and hot chicks.
Now, does this phenomenon work when you don't even notice the stimuli in question? No. And the only evidence that was ever produced to prove that unnoticeable stimuli work turned out to be extremely
misleading. The famous "flash a picture of a drink onscreen in a movie and watch the concession stand sales shoot up" experiment did the control group in winter and the test group in the heat of summer. You figure it out.