For the purposes of this question, I will define unconscious/subconscious as the parts of the human mind that are not normally available for introspection or control, but which are still involved in cognition. These parts of the mind might be involved in memory recall or assimilation of information. While I would define communication as receiving a recognizable response to input.
Have there been experiments attempting to establish communication with the researchers own unconscious mind? If so, what were their results? I'm not looking for "new age" kind of articles, but genuine scientific research findings.
The most direct way of communication that comes to mind would be talking to dream characters in a lucid dream and evaluating their responses upon awakening. Such characters are capable of semi-intelligent speech, and their responses at least casually appear to be related to the question at hand. A consistent pattern of responses over several dreams might be considered a form of communication.
Another experiment I can think of, which uses non-verbal communication would be using some daily activity to consistently triggers a recurring dream setting at night. For example, intense study causing dreams of classrooms or exams. In this case, the setting can be considered a response of unconscious system.
Another example I can think of is exposing a person to a stimuli which consistently causes some song to surface and "get stuck in one's head" - earworms during waking cognition. Alternatively, some saying or thought might arise unbidden in response to the stimuli. In this case, this can be considered another form of response.
Have there been scientific experiments along the lines described above? What would be the term I would use to search for "communicating with unconscious" in a scientific setting?