The evidence for the most compelling psi phenomena
Seeing | Psychology | 2026-05-08

In 2018, Professor Etzel Cardeña, PhD, published a landmark review paper surveying thousands of psi studies in “American Psychologist,” one of psychology’s most respected journals. In this conversation with Hans Busstra, Cardeña explains his main findings and why a dismissal of psi without looking at the data is “as unscientific as you can get.” Cardeña’s conclusion is that the cumulative evidence for psi phenomena is so strong that outright dismissal is no longer scientifically justified.
Etzel Cardeña’s university webpage:
https://portal.research.lu.se/en/persons/etzel-carde%C3%B1a/
A selection from Cardeña’s work:
“The experimental evidence for parapsychological phenomena: A review. American Psychologist”, 73(5), 663–677. Cardeña, E. (2018). https://doi.org/10.1037/amp0000236
“A Consensus Taxonomy of Altered (Nonordinary) States of Consciousness: Bringing Order to Disarray” (2025) by Etzel Cardeña and collaborators, https://psycnet.apa.org/fulltext/2026-28269-001.html
“Parapsychology: A Handbook for the 21st Century.”, Cardeña, E., Palmer, J., & Marcusson-Clavertz, D. (Eds.) (2015). https://www.amazon.com/Parapsychology-Handbook-Century-Etzel-Carde%C3%B1a/dp/0786479167
Chapter marks:
0:00 Introduction
2:22 Unpacking the 2018 review paper: “The experimental evidence for parapsychological phenomena: A review”
5:33 The difficulty with macro-psychokinesis
7:11 The small but significant effect sizes of micro-psychokinesis
8:16 Why aren’t all people with precognition billionaires?
9:13 Can you influence dice?
10:55 Why are the effect sizes so small?
12:20 Extrasensory perception and survival
14:28 Instead of problematizing altered states of consciousness, we should problematize normal waking consciousness
18:28 On the importance of a taxonomy of states of consciousness
22:30 How to define the hypnotic state?
25:58 On the ineffability of altered states
27:32 Etzel’s view on the compatibility between psi and physics
31:02 The divide between people who have and haven’t had experiences of altered states of consciousness
33:04 On the Ganzfeld effect
40:30 What could be the mechanism behind the Ganzfeld results?
44:11 Metaphysics and the future of parapsychology
48:53 What is the quality of skeptical critique?
50:56 What about the “file drawer effect”?
51:59 On Jim Carrey’s impersonation of Andy Kaufman
57:38 Does your work in psi lead to a greater sense of meaning in life?

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