A new study co-authored by (among others) Dean Radin and Julie Beischel has found that electrocortical activity during mediumistic 'communication' is distinctly different than during other contemplative moments such as thinking about living or imaginary people. The research was done to explore two questions: possible correlations between the accuracy of mediums’ statements and the electrical activity in their brain; and the differences in mediums’ brain activity when they intentionally evoked four different subjective states.
To do so, the researchers collected psychometric and brain electrophysiology data from "six individuals who had previously reported accurate information about deceased individuals under double-blind conditions" (ie. mediums - or more accurately, mediums previously accredited by Julie Beischel's Windbridge Institute). Each experimental participant performed two tasks with eyes closed. In the first task, the medium was given the first name of a deceased person and asked 25 questions, after which they were asked to silently perceive information relevant to the question for 20 seconds and then respond. These responses were then scored for accuracy by individuals who knew the deceased persons. Researchers found that of the four mediums whose accuracy could be evaluated, three scored significantly above chance (p < 0.03). One of the mediums also showed a highly significant correlation between accuracy and brain activity in frontal theta.
In the second task, participants were asked to experience four mental states for 1 min each, a process that was repeated three times: (1) thinking about a known living person, (2) listening to a biography, (3) thinking about an imaginary person, and (4) interacting mentally with a known deceased person. Interestingly, statistically significant differences in electrocortical activity among the four mental states were found in all six participants, leading the researchers to conclude that the differences in electrocortical activity "suggest that the impression of communicating with the deceased may be a distinct mental state distinct from ordinary thinking or imagination".
Here's the conclusion of the paper, in the authors' words:
To conclude, we believe the results for Medium 1, correlating accuracy with electrocortical activity, qualify as a robust finding. The results regarding differences in gamma power bands between different mental states remains puzzling as the gamma difference we observed seems to arise, at least in part, from eye or muscular activity. The characterization of the exact nature of this difference in the gamma frequency band, and assessing whether any of this activity originates from the brain, calls for additional research. Taken together, the study’s findings suggest that the experience of communicating with the deceased may be a distinct mental state that is not consistent with brain activity during ordinary thinking or imagination.
For more information on scientific research into mediumship, check out my recent book Stop Worrying! There Probably is an Afterlife and also Julie Beischel's memoir on her work, Among Mediums: A Scientist's Quest for Answers.