Testing alleged mediumistic writing: An experimental controlled study

Mediumship is understood as a kind of spiritual experience in which a person (i.e., a medium) claims to be in communication with, or under the control of, spiritual beings. In the last decades there has been a resurgence of studies on psychological, psychiatric and neuroscientific aspects of mediumship, as well as studies assessing the claim that mediums can obtain anomalous information from deceased persons.

To assess the evidence for anomalous information reception about deceased people in texts produced through alleged mediumistic writing (psychographic letters) under strictly controlled experimental conditions.

Eight mediums and ninety-four sitters participated in the study. Eighteen mediumistic writing sessions were carried out using blind proxy sitters. Later, each sitter received the target mediumistic letter and five control letters paired by gender and age. Sitters blindly scored the accuracy of the six letters both with a global score and for each of the objectively verifiable items of information presented on the letters. Scores from target and control letters were compared.

There was no difference in global evaluation and specific fit scores between control and target letters. The mediums involved in the research were not able to show evidence for providing anomalous information about deceased people when under our strict controlled conditions. We argue for establishing a reasonable compromise between ecological validity and controlled condition.