You may frequently use clairaudience as a means of spirit communication, although this is often used in conjunction with other senses. This is where sounds are heard within the mind almost as if the ears have heard them, or more rarely, actual sound heard by the ears. You might hear a name quite loudly in your mind and know that this is the name of the spirit companion trying to communicate with your client. Sometimes single letters or numbers are heard, this is due to spirits' frequent inability to communicate fully. Conversations very rarely occur in the mind of the medium unless they are very advanced or in a state of trance.
If what the psychic medium says doesn’t make sense to you, just say you don’t know or don’t understand what they are talking about. Don’t try to make it fit! If the psychic medium asks if you had a dog named Freckles, don’t say, “I had a cat named Mittens!” Don’t try to make the message fit if it doesn’t. The psychic medium will figure out what the message means without you interpreting it yourself.
Clairvoyance, where you see images, objects, people and scenes presented to you in your mind's eye. For this it's best to build up a bank of symbols (archetypes) for spirits to present to you that represent certain meanings to you. Your mind is an open book to the spirit world as long as you allow it. Your personal language of symbols and their meanings is accessible to them. As an example, if you decide that a horse represents freedom to you, if spirit shows you a horse then the topic is going along the lines of the client needing more freedom or gaining more freedom. Other accompanying symbols should clarify this.
In 1918, Joseph Jastrow wrote about the tricks of Eusapia Palladino who was an expert at freeing her hands and feet from the control in the séance room. In the séance room Palladino would move curtains from a distance by releasing a jet of air from a rubber bulb that she had in her hand. According to the psychical researcher Harry Price "Her tricks were usually childish: long hairs attached to small objects in order to produce 'telekinetic movements'; the gradual substitution of one hand for two when being controlled by sitters; the production of 'phenomena' with a foot which had been surreptitiously removed from its shoe and so on."
The psychical researchers W. W. Baggally and Everard Feilding exposed the British materialization medium Christopher Chambers as a fraud in 1905. A false moustache was discovered in the séance room which he used to fabricate the spirit materializations. The British medium Charles Eldred was exposed as a fraud in 1906. Eldred would sit in a chair in a curtained off area in the room known as a "séance cabinet". Various spirit figures would emerge from the cabinet and move around the séance room, however, it was discovered that the chair had a secret compartment that contained beards, cloths, masks, and wigs that Eldred would dress up in to fake the spirits.
Here's what happened: The experienced psychographers showed lower levels of activity in the left hippocampus (limbic system), right superior temporal gyrus, and the frontal lobe regions of the brain during psychography compared to their normal (non-trance) writing. The frontal lobe areas are associated with reasoning, planning, generating language, movement, and problem solving, which means that the mediums were experiencing reduced focus, lessened self-awareness and fuzzy consciousness during psychography.
Michael Shermer criticized mediums in Scientific American, saying, "mediums are unethical and dangerous: they prey on the emotions of the grieving. As grief counselors know, death is best faced head-on as a part of life." Shermer wrote that the human urge to seek connections between events that may form patterns meaningful for survival is a function of natural evolution, and called the alleged ability of mediums to talk to the dead "a well-known illusion of a meaningful pattern."
Attempts to communicate with the dead and other living human beings, aka spirits, have been documented back to early human history. The story of the Witch of Endor (In the most recent edition of the NIV witch is rendered medium in the passage) tells of one who raised the spirit of the deceased prophet Samuel to allow the Hebrew king Saul to question his former mentor about an upcoming battle, as related in the Books of Samuel in the Jewish Tanakh (the basis of the Old Testament).