subliminal ads are anything that your´ perceive (hear/see) but are not conscious of, hearing adverts while you are asleep - when you are not conscious are the same.
Subliminal: 1. inadequate to produce a sensation or a perception. 2 : existing or functioning below the threshold of consciousness
Subliminal: 1. inadequate to produce a sensation or a perception. 2 : existing or functioning below the threshold of consciousness