Covert hypnosis refers to an attempt to communicate with another person's unconscious mind without that person noticing. As it often takes place in the course of a seemingly regular conversation, it is also known as conversational hypnosis or sleight of mouth. The objective is to change the person’s behavior subconsciously so that the target believes that they changed their mind of their own volition. When performed successfully, the target is unaware that they have been hypnotized or that anything unusual has occurred.