2.  Receiving information from a discarnate entity or a higher spiritual being. It may also refer to communication with an aspect of one’s own subconscious mind. It is similar to, but not necessarily the same as, the spirit communication of mediumship. In both, however, one person serves as bridge between a spirit or spiritual intelligence and people of ordinary consciousness. In spirit communication, the medium is more often unaware of the communication; in channeling of spiritual intelligence, the channeler is more often aware and sometimes a participant. 

Automatic Writing is a form of Channeling in which a person, sometimes in trance, writes or even keyboards messages generally believed to originate with spiritual beings, or with aspects of the subconscious mind.

Suggested Reading –

Wiseman: Writing the Divine – How to Use Channeling for Soul Growth & Healing