Mediumship is the faculty all humans have of communicating with the spirit world. Everyone is a medium to a certain degree, but we mainly call mediums those who manifest their mediumistic abilities more noticeably. Their physical organizations have a higher degree of sensitivity. Mediums can also express their abilities in a variety of ways, as summarized below:
Medium of physical effects allow spirits to move inert objects, make noises, etc. Facultative mediums know that they have such abilities, while Involuntary Mediums are unaware that spirits use them to create such effects.
1) Sensitive or Impressible mediums can feel the presence of the spirits. It is a rudimentary faculty, essential to the development of the other ones.
2) Hearing mediums “can hear the voice of spirits.”
3) Speaking mediums allow spirits to use their voice to communicate, which they may be aware of or not.
4) Seeing mediums can see spirits. They see with the soul, so it is irrelevant whether their physical eyes are open or not.
5) Somnambulic mediums "act under the influence of their own spirit; it is their own soul who, in moments of emancipation, sees, hears, and perceives beyond the limits of the senses," making it easier for them to communicate with spirits.
6) Healing mediums promote cures or alleviation of physical ailments by the laying on of hands or prayers.
7) Writing or psychographic mediums: channel the spirits' guidance through writing. They can be: mechanical, who are not aware of what they write; intuitive, who receive the spirits' thoughts, interpret them, and then write them down; and semi-mechanical—the most common of the three types—who are aware of what they write, but their hands move without their will.