After her death in the 1980s the medium Doris Stokes was accused of fraud, by author and investigator Ian Wilson. Wilson stated that Mrs Stokes planted specific people in her audience and did prior research into her sitters. Rita Goold a physical medium during the 1980s was accused of fraud, by the psychical researcher Tony Cornell. He claimed she would dress up as the spirits in her séances and would play music during them which provided cover for her to change clothes.
A widely known channeler of this variety is J. Z. Knight, who claims to channel the spirit of Ramtha, a 30 thousand-year-old man. Others purport to channel spirits from "future dimensions", ascended masters, or, in the case of the trance mediums of the Brahma Kumaris, God. Other notable channels are Jane Roberts for Seth, Esther Hicks for Abraham, and Carla L. Rueckert for Ra.
Mediums obtain messages from the spirit world in different ways. Some receive intuitive information, in which images and words appear as mental impressions that are then relayed along to the living. In other cases, a medium may hear actual auditory messages or see actual images of these messages. Many people who do spirit communication regularly find that the dead can be quite a chatty bunch sometimes. If they've got something to tell you, they're going to make sure you get told. What you choose to do with the information is up to you, but a lot of mediums, it can feel like they've got someone's dead granny screaming in their ears, and if they don't pass that message along to you, she's not going to shut up.