Mosts of them are a bit too subliminal for me. Most of them I can't tell what it's supposed to spell, even with my full consciousness trained on it. Let alone, if it was only unconscious.
Your mind filters out more than you realize. But only to reduce the burden on your consciousness. Somewhere deep inside, something is still processing that crap ton of data and it knows more than you and can definitely influence the conscious you.
Are you referring to the hoax from the '50s or something else?
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1559-1816....
I do not know what '50s hoax you are talking about.