bbianca127 writes: Researchers studied classical conditioning in 55 study participants while sleeping or awake. According to the article, "Classical conditioning teaches a person or animal to associate one stimulus with another." The researchers paired tones with scents; when they played a tone, they would let out a particular scent while the participants were sleeping. They found that the participants would make the association between the tones and scents even while awake.
The most difficult thing in the world is to know how to do a thing and to
watch someone else doing it wrong, without commenting.
-- T.H. White