Mediumship is communication with the Spirit world by various means.
Any of the normal senses can be invoked but the most common are
Clairvoyance is where the Medium will see images which can be symbolic or direct in terms of the communication. As an example, the Medium may see a picture of wires indicating that the spirit was an electrician
Clairaudience is the ability to hear. This can be the hardest as the communication can be very quick, but often leads to the accurate communication of specific details such as precise dates of birth,
Clairsentience involves the Medium actually feeling something. They may for instance get a temporary pain in part of their body which they didn't have before, indicating that the communicating spirit had a problem in that area