In 1917, Edward Clodd analyzed the mediumship of the trance medium Gladys Osborne Leonard and came to the conclusion that Leonard had known her séance sitters before she had held the séances, and could have easily obtained such information by natural means. The British psychiatrist Charles Arthur Mercier wrote in his book Spiritualism and Sir Oliver Lodge (1917) that Oliver Lodge had been duped into believing mediumship by trickery and his spiritualist views were based on assumptions and not scientific evidence.
When the spirit of a loved one visits us, they do it for one simple reason: because they love us. Think of it like this: If you passed your beloved grandmother on the street, wouldn't you stop and say hi? Even though they are in another dimension, they still experience, know, and understand the world we live in, and they love us and want us to know this. So look for signs from them.
Illusionists, such as Joseph Rinn have staged 'fake' séances in which the sitters have claimed to have observed genuine supernatural phenomena. Albert Moll studied the psychology of séance sitters. According to (Wolffram, 2012) "[Moll] argued that the hypnotic atmosphere of the darkened séance room and the suggestive effect of the experimenters' social and scientific prestige could be used to explain why seemingly rational people vouchsafed occult phenomena." The psychologists Leonard Zusne and Warren Jones in their book Anomalistic Psychology: A Study of Magical Thinking (1989) wrote that spirits controls are the "products of the medium's own psychological dynamics."
"Have a little fun with friends," she told INSIDER. "Before going out one night, pull three cards with the intention of the cards giving you some forewarning about the evening. Let it be fun and easy and involve everyone! You can even ask, 'what happens if we go to this spot or this one?' Let the cards decide your night and see if they gave good advice!"