Overview

Cardeña’s career has been defined by a commitment to rigorous, phenomenologically informed investigation of consciousness and anomalous experience. Rather than treating hypnosis, dissociation, and psi as separate domains, he has consistently argued for their integration, recognizing that the same individual differences (absorption, dissociation, hypnotizability) predict responsiveness across all three. This integrative stance has made his work a bridge between mainstream clinical and cognitive psychology and parapsychology, demonstrating that anomalous experiences are neither pathological nor marginal, but rather expressions of normal human consciousness variation.

His methodological contributions are equally significant. Cardeña has been a vocal advocate for neurophenomenology (the simultaneous investigation of subjective experience and neural correlates) and for careful attention to individual differences, demand characteristics, and the distinction between special states and special abilities. He has also been instrumental in establishing the Journal of Anomalous Experience and Cognition (JAEX), creating a dedicated peer-reviewed venue for work that bridges anomalous experiences and cognition across disciplines.⁸

Life and career

Cardeña received his doctoral training at the University of California, Davis, where he conducted his dissertation research on the phenomenology of deep hypnosis, examining both quiescent and physically active hypnotic states. This early work established his signature approach: detailed phenomenological description paired with systematic measurement and neurophysiological investigation. His dissertation findings on spontaneous anomalous experiences in highly hypnotizable individuals (including reports of tunnels, bright lights, and feelings of bliss) would later inform his comparative analysis of near-death experiences and hypnotic phenomena.¹

In the 1990s, Cardeña collaborated with David Spiegel at Stanford on dissociative disorders, contributing foundational work on diagnostic criteria and the relationship between dissociation and acute stress reactions.⁹¹⁰ This clinical grounding in trauma and dissociation became central to his later parapsychological work, where he and collaborators investigated whether dissociative capacity and hypnotizability predict psi task performance. By the early 2000s, Cardeña had established himself at Lund University, where he founded the Center for Research on Consciousness and Anomalous Psychology (CERCAP) and began a sustained program of research integrating hypnosis, dissociation, and anomalous cognition.

Throughout the 2000s and 2010s, Cardeña published extensively on the phenomenology of hypnosis, the relationship between dissociation and psi, and the neurophysiology of altered states. He co-edited landmark volumes synthesizing research on anomalous experiences, including Varieties of Anomalous Experience (2000) and a comprehensive handbook on the psychology of anomalous experiences (2013).¹¹¹² These works established him as a leading theorist capable of integrating disparate literatures (from hypnosis and dissociation to mediumship, near-death experiences, and psi) into a coherent framework grounded in consciousness science.

In recent years, Cardeña has expanded his focus to include comparative phenomenology across altered states. He has examined similarities and differences between hypnotic and psychedelic experiences, investigated the phenomenology of distressing near-death experiences, and explored how trait absorption and dissociation relate to spirit communication experiences.¹³⁶⁷ He has also served as a critical voice in the field, publishing commentaries and methodological critiques that challenge both mainstream and parapsychological assumptions about consciousness and psi.

Research

Hypnosis, phenomenology, and individual differences

Cardeña’s foundational work on hypnotic phenomenology established that highly hypnotizable individuals report a rich array of spontaneous, unsuggested experiences during hypnosis, including alterations in body image, time sense, and anomalous perceptions. His doctoral dissertation on deep hypnosis identified two distinct phenomenological profiles: quiescent hypnosis (characterized by relaxation and internal focus) and physically active hypnosis (involving spontaneous movement and kinesthetic phenomena).¹⁴ This typological insight has influenced subsequent research on heterogeneity in hypnotic responding.

A central theme in Cardeña’s work is the role of individual differences in shaping hypnotic response. Rather than treating hypnosis as a unitary state, he has documented how hypnotizability, dissociation, absorption, and response expectancy jointly determine the quality and intensity of hypnotic experience. In a study with Terhune, he found that response expectancies, baseline experiences, and hypnotizability all independently predict spontaneous hypnotic phenomena, with complex interactions between expectancy and trait factors.³ This work challenged simplistic models that attribute hypnotic effects solely to suggestion or solely to trait capacity.

Cardeña has also been critical of claims about physiological markers of hypnosis. In a carefully controlled eye-tracking study, he and colleagues replicated and extended prior work claiming that specific eye behaviors index a discrete “hypnotic state.” Their results showed that while hypnosis produced some changes in eye motility (smaller saccades, slower antisaccades), these effects were not specific to highly hypnotizable individuals and did not support the existence of a unique physiological signature of hypnosis.⁴ This methodologically rigorous critique exemplifies his commitment to empirical scrutiny even of claims made within the hypnosis field.

Dissociation, hypnotizability, and psi

A distinctive contribution of Cardeña’s research program has been the systematic investigation of dissociation and hypnotizability as predictors of anomalous experiences and psi task performance. Working with Terhune and others, he has documented that dissociative tendencies and high hypnotizability are associated with greater reports of anomalous experiences, including out-of-body experiences, spirit communication, and psi-related phenomena.¹⁵ Importantly, he has also shown that this association is not pathological: individuals with high hypnotizability and dissociative capacity do not show elevated rates of mental disorder when screened appropriately.

In a meta-analytic synthesis, Cardeña and Terhune found that anomalous experiences are more prevalent among individuals who are both highly suggestible and highly dissociative, suggesting a specific phenotype characterized by enhanced capacity for alterations of consciousness and cognition.² This finding has important implications for understanding who is likely to report psi experiences and who may perform well in psi experiments. It also suggests that the same underlying capacity, perhaps related to absorption, cognitive flexibility, or the ability to decouple from external reality, may facilitate both hypnotic responding and anomalous cognition.

Mediumship, dissociation, and differential diagnosis

Cardeña has made significant contributions to understanding mediumship experiences and their relationship to dissociative pathology. In collaboration with Moreira-Almeida, he conducted structured interviews with Brazilian spiritist mediums and individuals with dissociative identity disorder, demonstrating that these phenomena can be reliably differentiated on multiple dimensions.⁵ Mediumship experiences typically occur in a religious context, are ego-syntonic (experienced as consistent with the person’s identity and values), and do not involve the fragmentation and distress characteristic of dissociative identity disorder. This work has important clinical implications, helping practitioners distinguish between pathological dissociation and culturally normative anomalous experiences.

More recently, Cardeña has examined the phenomenology of mediumship experiences in larger samples, finding that practitioners report more positive than negative affect surrounding their experiences, and that experiences beginning in adulthood within a religious context are associated with lower fear.¹⁶ He has also investigated the relationship between trait absorption and spirit communication experiences, finding a significant association that suggests absorption (the capacity to become deeply engaged in internal or external stimuli) may be a fundamental dimension predicting anomalous social-cognitive phenomena.⁷

Near-death experiences and consciousness

Cardeña’s recent work on near-death experiences (NDEs) exemplifies his integrative approach. He has noted striking phenomenological similarities between spontaneous experiences reported by hypnotic virtuosos and classical NDE features (bright lights, tunnels, feelings of bliss) suggesting that these may represent variations on a common underlying capacity for altered consciousness.¹ Importantly, he has also observed that individuals with lower ego strength (as measured by the Barron Ego Strength Scale) are more likely to experience distressing variants of these phenomena, whether in hypnosis, NDEs, or psychedelic contexts. This pattern suggests that psychological resilience and adaptability may buffer against adverse reactions to profound alterations of consciousness.

In a phenomenological analysis of distressing NDEs, Cardeña and colleagues found that such experiences include both negative features (darkness, frightening images, disturbing feelings) and positive aspects, with many NDErs reporting hybrid experiences that combine elements of both.⁶ The aftereffects of distressing NDEs were also variable, with some individuals reporting negative psychological sequelae and others reporting positive transformations. This nuanced picture challenges simplistic models that treat NDEs as uniformly positive or uniformly negative.

Methodological and theoretical contributions

Beyond specific empirical findings, Cardeña has made important methodological contributions to consciousness research. He has advocated for neurophenomenology (the simultaneous investigation of subjective experience and neural correlates) as essential to understanding altered states.¹⁷ He has also emphasized the importance of careful measurement of consciousness, the need to account for individual differences and demand characteristics, and the value of qualitative and phenomenological methods alongside quantitative approaches.

His work on hypnotic inductions, conducted with Terhune, exemplifies this methodological sophistication. Rather than accepting either the claim that inductions are critical to hypnotic responding or the claim that they are irrelevant, they argued for a more nuanced position: certain components of inductions appear efficacious in enhancing suggestibility, while others do not, and the effects vary across suggestions and assessment modes in ways that remain poorly understood.¹⁸ This kind of careful, evidence-based analysis of contested claims has become a hallmark of his work.

Integration and synthesis

Perhaps Cardeña’s most significant contribution has been his sustained effort to integrate research on hypnosis, dissociation, mediumship, near-death experiences, and psi into a coherent framework. Rather than treating these as separate phenomena studied by separate communities, he has consistently highlighted their commonalities: all involve alterations of consciousness, all are predicted by similar individual differences (absorption, dissociation, hypnotizability), and all may reflect variations on fundamental capacities of human consciousness.

His edited volumes and theoretical papers have made this integrative vision accessible to researchers across disciplines. The handbook on the psychology of anomalous experiences, for instance, brings together chapters on hypnosis, dissociation, mediumship, out-of-body experiences, near-death experiences, and psi, demonstrating both the diversity and the underlying unity of these phenomena.¹² His founding of the Journal of Anomalous Experience and Cognition institutionalized this integrative approach, creating a dedicated venue for work that crosses traditional disciplinary boundaries.⁸

Influence and reception

Cardeña’s work has been influential both within parapsychology and in mainstream psychology and neuroscience. His research on dissociation and hypnotizability has been cited extensively in clinical psychology and trauma literature. His phenomenological descriptions of altered states have informed consciousness research more broadly. And his integrative theoretical framework has provided a model for how parapsychology can be integrated with mainstream psychology rather than remaining isolated from it.

Within parapsychology, Cardeña is recognized as a leading figure in understanding the psychological and neurophysiological bases of psi experiences and performance. His work has helped establish that individual differences in dissociation and hypnotizability are among the most robust predictors of anomalous experiences and psi task success. This has shifted the field’s focus from asking “Is psi real?” to asking “What psychological and neurophysiological factors predict psi experiences and performance?”, a more tractable and scientifically productive question.

His methodological critiques have also been influential. His careful examination of claims about physiological markers of hypnosis, his attention to demand characteristics and individual differences, and his insistence on rigorous controls have set a high standard for consciousness research. Even when his findings challenge popular claims within the field, they are respected for their methodological rigor.

Cardeña’s work on mediumship and dissociation has had particular impact in clinical and cross-cultural psychology, helping practitioners understand how to distinguish between pathological dissociation and culturally normative anomalous experiences. This has important implications for diagnosis and treatment, particularly in cultures where mediumship and spirit communication are normative.

More broadly, Cardeña’s career exemplifies a model of scientific engagement with anomalous phenomena that is neither dismissive nor credulous, but rather rigorously empirical and theoretically sophisticated. His willingness to investigate phenomena that mainstream psychology has often ignored, while maintaining the highest standards of evidence and methodology, has helped legitimize the scientific study of anomalous experiences and cognition.