A number of spiritualist periodicals appeared in the nineteenth century, and these did much to hold the movement together. Among the most important were the weeklies the Banner of Light (Boston), the Religio-Philosophical Journal (Chicago), Mind and Matter (Philadelphia), the Spiritualist (London), and the Medium (London). Other influential periodicals were the Revue Spirite (France), Le Messager (Belgium), Annali dello Spiritismo (Italy), El Criterio Espiritista (Spain), and the Harbinger of Light (Australia). By 1880, there were about three dozen monthly spiritualist periodicals published around the world.[42] These periodicals differed a great deal from each other, reflecting the great differences among spiritualists. Some, such as the British Spiritual Magazine were Christian and conservative, openly rejecting the reform currents so strong within spiritualism. Others, such as Human Nature, were pointedly non-Christian and supportive of socialism and reform efforts. Still others, such as the Spiritualist, attempted to view spiritualist phenomena from a scientific perspective, eschewing discussion on both theological and reform issues.[43]
"Trance mediumship" is often seen as a form of mental mediumship. Most trance mediums remain conscious during a communication period, wherein a spirit uses the medium's mind to communicate. The spirit or spirits using the medium's mind influences the mind with the thoughts being conveyed. The medium allows the ego to step aside for the message to be delivered. At the same time, one has awareness of the thoughts coming through and may even influence the message with one's own bias. Such a trance is not to be confused with sleepwalking, as the patterns are entirely different. Castillo (1995) states, 

Do compose your emotions and appearance to hide any revealing information about yourself. Your facial expression, style of dress, personal mannerisms, and emotional outbursts can tell a psychic, especially a false one, a great deal about you to make it look like she knows all these things from a paranormal reading, when in fact, she is merely interpreting your physical appearance or reactions.
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