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Altered States of Consciousness and Self-Transcendence

This article explores the relationship between altered states of consciousness (ASCs) and self-transcendence within the framework of transpersonal psychology. It delves into the theoretical foundations of ASCs, their neurobiological and psychological mechanisms, and their role in facilitating profound personal transformation. Various methods of inducing ASCs, such as meditation, psychedelics, and near-death experiences, are examined for their ability to promote self-transcendence, ego dissolution, and expanded awareness. Additionally, the integration of ASCs into therapeutic practices is discussed, highlighting both the potential benefits and ethical considerations involved in their application. Empirical studies and case examples are used to illustrate the lasting impact of ASCs on psychological well-being and spiritual growth. This article concludes with an evaluation of ASCs’ relevance in contemporary therapeutic settings and suggests directions for future research in this evolving field.

Introduction

Altered states of consciousness (ASCs) have long intrigued both scholars and practitioners across various disciplines, from psychology and neuroscience to spiritual traditions. ASCs refer to temporary conditions in which the individual’s normal cognitive and perceptual processes are significantly altered, leading to changes in awareness, thought patterns, and sense of self (Vaitl et al., 2005). These experiences range from meditative and psychedelic states to spontaneous experiences like near-death events. Historically, many cultures have recognized the transformative power of these states, often associating them with mystical or spiritual insights (Winkelman, 2011). In modern psychology, particularly within the realm of transpersonal psychology, ASCs are viewed as gateways to self-transcendence, where individuals may experience profound shifts in their understanding of the self and reality.

Self-transcendence, a key concept in transpersonal psychology, refers to the process through which individuals go beyond their ego-bound self and connect with a higher sense of purpose, unity, or the divine (Maslow, 1971). This process often involves a dissolution of the ego and a reconnection with a broader sense of identity and meaning, leading to increased psychological well-being and personal growth (Yaden et al., 2017). ASCs are seen as facilitating self-transcendence by disrupting habitual cognitive patterns, allowing for deeper introspection, expanded awareness, and experiences of unity or interconnectedness (Tart, 2001). Research suggests that these states can have lasting effects on mental health, contributing to personal healing, increased life satisfaction, and spiritual growth (Griffiths et al., 2008).

The significance of altered states in the pursuit of self-transcendence lies not only in their ability to transform individual consciousness but also in their potential therapeutic applications. Within transpersonal psychology, ASCs are harnessed in therapeutic settings to address psychological distress, trauma, and existential concerns. Techniques such as meditation, breathwork, and psychedelic-assisted therapy have shown promise in promoting self-awareness, emotional healing, and psychological integration (Johnson et al., 2019). As the field of psychology continues to explore the therapeutic potential of ASCs, understanding the mechanisms through which they facilitate self-transcendence remains critical. This article examines the interplay between ASCs and self-transcendence, highlighting the neurobiological, psychological, and therapeutic dimensions of these profound experiences.

Theoretical Foundations of Altered States of Consciousness and Self-Transcendence

Definitions and Types of Altered States of Consciousness (ASCs)

Altered states of consciousness (ASCs) encompass a broad range of psychological and physiological states in which an individual’s normal waking consciousness is significantly modified. These modifications may include changes in perception, cognition, emotions, and sense of self, leading to a departure from ordinary experiences of reality (Vaitl et al., 2005). ASCs can be induced through various means, including meditation, hypnosis, psychedelic substances, sensory deprivation, and spontaneous occurrences such as near-death experiences. Each type of ASC offers unique phenomenological characteristics, which can involve shifts in sensory perception, time distortion, emotional intensity, and a sense of unity with one’s surroundings or the universe (Tart, 2001). These states have been widely studied in psychology, neuroscience, and anthropology for their potential to foster deep personal and spiritual insights.

One of the most well-known ASCs is the dream state, which has been studied extensively in both Western and Eastern traditions for its symbolic and transformative power. Dreams often provide access to unconscious material, as discussed in psychoanalytic theories by Freud and Jung (Freud, 1900; Jung, 1961). Hypnosis, another widely studied ASC, involves focused attention and increased suggestibility, enabling individuals to bypass normal cognitive defenses and access deeper emotional and psychological content (Hilgard, 1977). Psychedelics, such as psilocybin, LSD, and ayahuasca, induce powerful ASCs that can radically alter perception, cognition, and self-awareness, often leading to profound existential and spiritual insights (Griffiths et al., 2006). Each of these states provides unique opportunities for exploring consciousness and self-transcendence, particularly when used within structured, intentional frameworks such as therapy or spiritual practice.

Culturally, ASCs have been utilized for centuries in religious and spiritual contexts to facilitate healing, vision quests, and mystical experiences (Winkelman, 2011). Indigenous practices often involve the use of psychoactive substances like peyote or ayahuasca in ritualistic settings, where altered states are believed to connect participants with higher realms of consciousness or the divine (Metzner, 2005). The study of these cultural practices has contributed to a growing understanding of the universal role that ASCs play in human psychological and spiritual development. While modern scientific inquiry has focused primarily on the neurobiological and psychological mechanisms of ASCs, the cross-cultural relevance of these states underscores their significance in fostering self-transcendence and personal transformation.

Self-Transcendence and its Relation to ASCs

Self-transcendence, a key concept within humanistic and transpersonal psychology, refers to the experience of transcending the individual ego and connecting with a higher or broader aspect of existence (Maslow, 1971). This can manifest as a deep sense of unity with the universe, a connection with a higher power, or the dissolution of boundaries between the self and others. Altered states of consciousness (ASCs) are often seen as facilitating this process, as they allow individuals to temporarily step outside their normal ego-bound consciousness and access higher states of awareness (Yaden et al., 2017). ASCs can disrupt habitual cognitive patterns and provide individuals with the opportunity to explore new perspectives on the self, life, and existence, often leading to profound psychological and spiritual shifts.

One of the primary psychological mechanisms through which ASCs promote self-transcendence is ego dissolution, a phenomenon frequently reported in experiences induced by meditation, psychedelics, and near-death experiences (Nour et al., 2016). Ego dissolution refers to a temporary loss of the sense of a separate self, which allows individuals to experience themselves as part of a larger whole. This dissolution of ego boundaries can lead to an expanded sense of identity and increased feelings of compassion, interconnectedness, and spiritual insight (Letheby, 2020). Studies on psychedelic experiences, for example, have shown that participants often report lasting positive changes in their worldview, including a greater sense of meaning, purpose, and connection with the universe (Griffiths et al., 2008).

Furthermore, ASCs can foster deep introspection and self-reflection, which are essential for psychological growth and self-transcendence. By altering ordinary cognitive processes, ASCs provide individuals with an opportunity to confront suppressed emotions, unresolved conflicts, and existential questions (Winkelman, 2011). In therapeutic contexts, such as transpersonal therapy, ASCs are used intentionally to guide individuals through these transformative processes. Whether through meditation, breathwork, or guided psychedelic sessions, the altered state serves as a catalyst for breaking down the ego’s defenses, enabling individuals to transcend their usual limitations and achieve a greater sense of unity, purpose, and self-understanding.

Neurobiological Underpinnings of ASCs and Transcendence

The neurobiological mechanisms underlying altered states of consciousness (ASCs) and self-transcendence have been an area of growing interest in recent years. Research has identified several key brain structures and neurochemical pathways that are implicated in both ASCs and experiences of transcendence. One of the most prominent findings is the role of the default mode network (DMN), a collection of brain regions involved in self-referential thinking, the maintenance of the ego, and the perception of time (Carhart-Harris et al., 2014). During ASCs induced by meditation, psychedelics, or deep relaxation, activity in the DMN decreases, leading to a temporary suspension of the sense of self and time. This disruption of the DMN is believed to facilitate experiences of ego dissolution and self-transcendence (Carhart-Harris et al., 2012).

Neurochemical changes also play a critical role in ASCs. Research has shown that neurotransmitters such as serotonin, dopamine, and endorphins are heavily involved in the regulation of ASCs (Nichols, 2016). For instance, psychedelics like psilocybin and LSD work primarily by acting on serotonin receptors, particularly the 5-HT2A receptor, which is associated with sensory perception, mood, and cognition (Vollenweider & Kometer, 2010). This interaction leads to the characteristic alterations in perception and cognition experienced during psychedelic states, as well as the profound emotional and spiritual experiences often reported by users (Griffiths et al., 2006). Additionally, meditation practices that induce ASCs, such as mindfulness and transcendental meditation, have been shown to increase the release of dopamine and other “feel-good” neurochemicals, contributing to the states of bliss, peace, and transcendence often reported during deep meditation (Lazar et al., 2000).

The long-term effects of ASCs on the brain and consciousness are also an area of considerable interest. Studies have demonstrated that repeated experiences of ASCs, whether through meditation, psychedelics, or other means, can lead to neuroplastic changes in the brain, enhancing cognitive flexibility, emotional regulation, and overall well-being (Carhart-Harris et al., 2018). These findings suggest that ASCs not only provide temporary alterations in consciousness but may also have lasting impacts on an individual’s psychological and spiritual development. As neuroscience continues to explore the mechanisms of ASCs, it becomes increasingly clear that these states offer valuable insights into the nature of consciousness and the potential for self-transcendence.

Mechanisms of Altered States of Consciousness in Facilitating Self-Transcendence

Meditative Practices and Self-Transcendence

Meditation has long been recognized as one of the most effective methods for inducing altered states of consciousness (ASCs) that facilitate self-transcendence. Different forms of meditation, including mindfulness meditation, transcendental meditation, and Vipassana, have been shown to produce profound changes in consciousness by altering the brain’s normal activity patterns (Lazar et al., 2000). Through sustained attention and introspection, meditation helps individuals quiet the mind, reduce attachment to thoughts, and transcend the ego. This ego dissolution, which is central to self-transcendence, allows individuals to experience a greater sense of unity with their environment and even the cosmos (Yaden et al., 2017). Research demonstrates that long-term meditators often report a reduced sense of separation between self and others, leading to enhanced empathy and compassion (Kabat-Zinn, 2003).

The neurobiological mechanisms underlying these experiences involve changes in brain activity, particularly in areas such as the prefrontal cortex, amygdala, and the default mode network (DMN). Meditation reduces activity in the DMN, which is responsible for self-referential thinking and mind-wandering (Brewer et al., 2011). This reduction in DMN activity correlates with feelings of ego dissolution and expanded awareness, key components of self-transcendence (Carhart-Harris et al., 2014). Furthermore, meditation has been found to increase functional connectivity in brain regions associated with emotional regulation and empathy, helping individuals transcend their egocentric concerns and cultivate a deeper sense of connection to others (Lutz et al., 2008).

Empirical studies also suggest that meditation-induced ASCs can lead to lasting psychological and spiritual benefits. A meta-analysis by Sedlmeier et al. (2012) found that regular meditation practice improves psychological well-being, decreases anxiety, and enhances emotional resilience. Moreover, meditation practices that focus on transcending the self, such as loving-kindness meditation, have been shown to increase feelings of altruism and interconnectedness (Fredrickson et al., 2008). These findings underscore the role of meditation in fostering self-transcendence by facilitating ASCs that dissolve the ego, expand awareness, and promote a more unified and compassionate sense of self.

Psychedelics and Entheogens in Facilitating Transcendence

Psychedelic substances, often referred to as entheogens in spiritual contexts, have gained renewed attention in psychological and neuroscientific research for their ability to induce altered states of consciousness that promote self-transcendence. Historically, substances like psilocybin, LSD, and ayahuasca have been used in religious and healing ceremonies to facilitate mystical experiences and foster personal transformation (Winkelman, 2011). Contemporary research supports these traditional uses, showing that psychedelics can induce profound experiences of ego dissolution, unity with the universe, and spiritual insight (Griffiths et al., 2006). Such experiences are often described as transcendent, with individuals reporting a deep sense of interconnectedness with all living beings and a shift away from self-centered concerns.

The neurobiological effects of psychedelics provide insights into how these substances facilitate self-transcendence. Psychedelics, particularly psilocybin and LSD, act on serotonin receptors in the brain, specifically the 5-HT2A receptor, which is involved in regulating mood, cognition, and perception (Nichols, 2016). This interaction leads to a temporary disintegration of the normal patterns of brain activity, particularly in the DMN, similar to what occurs during deep meditation (Carhart-Harris et al., 2012). The reduced activity in the DMN correlates with feelings of ego dissolution, where individuals lose their sense of separateness and experience a sense of unity with the universe (Lebedev et al., 2015). This state of ego dissolution is a key mechanism by which psychedelics facilitate self-transcendence.

In addition to these neurobiological effects, the psychological impact of psychedelic experiences can lead to long-term changes in an individual’s outlook on life and self-concept. Research has shown that a single psychedelic experience can result in enduring increases in psychological well-being, openness to new experiences, and a greater sense of life purpose (Griffiths et al., 2011). In clinical settings, psychedelic-assisted therapy has been used to treat conditions such as depression, anxiety, and PTSD, with participants often reporting transformative experiences that involve a deep sense of interconnectedness and self-transcendence (Johnson et al., 2019). These findings suggest that psychedelics offer a powerful tool for inducing ASCs that promote self-transcendence, particularly when used in controlled and supportive settings.

Near-Death Experiences (NDEs) and Other Spontaneous ASCs

Near-death experiences (NDEs) represent another form of altered state of consciousness that can lead to profound self-transcendent experiences. NDEs occur when individuals face life-threatening situations, such as cardiac arrest or severe trauma, and subsequently report experiences such as moving through a tunnel, encountering a light, and experiencing a sense of peace and unity (Greyson, 2003). These experiences often involve a dissolution of the ego and a feeling of transcending the self, as individuals report a sense of merging with the universe or encountering a divine presence. NDEs have been studied for their long-lasting effects on individuals’ psychological and spiritual outlook, with many people describing significant shifts in their values, beliefs, and sense of self following the experience (Ring, 1984).

The mechanisms behind NDEs and their role in self-transcendence remain a subject of debate, though both physiological and psychological explanations have been proposed. Some researchers suggest that NDEs may result from hypoxia, or lack of oxygen to the brain, during life-threatening events (Carr, 1982). Others argue that NDEs are best understood as profound psychological experiences that allow individuals to transcend the fear of death and the confines of the ego (Greyson, 2000). Regardless of the underlying cause, NDEs often lead to lasting personal transformation, with individuals reporting a greater sense of purpose, reduced fear of death, and an increased feeling of connectedness with others and the universe (Moody, 1975).

Beyond NDEs, other spontaneous ASCs, such as mystical experiences or spontaneous spiritual awakenings, also facilitate self-transcendence. These experiences often occur without warning and can involve sudden insights into the nature of reality, deep feelings of unity, and a dissolution of the individual ego (Hood, 2002). Like NDEs, these spontaneous ASCs can result in profound shifts in an individual’s worldview, leading to greater psychological well-being and spiritual growth (Yaden et al., 2017). The spontaneous nature of these experiences underscores the idea that self-transcendence can arise not only through intentional practices like meditation or psychedelics but also through unexpected encounters with altered states of consciousness.

Integration of Altered States into Psychotherapeutic Practice

Transpersonal Therapy and Altered States

In transpersonal therapy, altered states of consciousness (ASCs) are often utilized as therapeutic tools to facilitate deep psychological healing and self-transcendence. Transpersonal therapy differs from traditional psychotherapeutic approaches by explicitly incorporating spiritual and existential dimensions into the therapeutic process (Friedman & Hartelius, 2013). Techniques such as guided visualization, breathwork, and mindfulness meditation are commonly used to induce ASCs, providing clients with access to deeper layers of consciousness beyond the ego. These altered states allow clients to confront suppressed emotions, unresolved trauma, and existential questions in a non-ordinary state of awareness, often leading to profound personal transformation (Scotton et al., 1996). By transcending the limitations of everyday consciousness, clients can access broader perspectives on their life experiences and develop a more holistic understanding of themselves.

One of the most widely used techniques in transpersonal therapy is holotropic breathwork, developed by Stanislav Grof. This technique combines accelerated breathing patterns with evocative music to induce ASCs that facilitate deep emotional and psychological exploration (Grof & Grof, 2010). During holotropic breathwork sessions, clients may experience vivid imagery, repressed memories, and intense emotional release, which can lead to healing and integration. The ASC induced by breathwork helps bypass the conscious mind’s defenses, enabling individuals to access unresolved issues and gain insights that are not easily available in ordinary states of consciousness. These experiences can often lead to breakthroughs in therapy, helping clients overcome long-standing emotional blocks and move toward greater self-awareness and self-transcendence (Grof, 2000).

In addition to breathwork, mindfulness meditation is another commonly used method for inducing ASCs in therapeutic settings. Mindfulness practices, which focus on cultivating present-moment awareness and non-judgmental acceptance of thoughts and feelings, have been shown to promote emotional regulation, reduce stress, and enhance self-awareness (Kabat-Zinn, 2003). In the context of transpersonal therapy, mindfulness is used to help clients transcend their habitual patterns of thought and emotion, leading to greater psychological flexibility and insight. Through regular practice, clients can develop the ability to enter altered states of consciousness more easily, allowing them to explore their inner worlds with greater depth and clarity. This process of self-exploration often leads to significant personal growth, as clients learn to transcend the ego and connect with a deeper sense of purpose and meaning (Wilber, 2000).

The Ethical Considerations and Challenges of Inducing ASCs in Therapy

While ASCs offer powerful therapeutic benefits, their use in psychotherapy also raises important ethical considerations and challenges. One of the primary concerns is the potential for clients to experience intense emotional reactions or re-traumatization during altered states, particularly if they encounter unresolved trauma or difficult memories (Brewerton et al., 2012). Therapists must be trained to recognize the signs of distress during ASCs and provide appropriate support to help clients process these experiences safely. Without proper guidance and support, clients may become overwhelmed or retraumatized, which could hinder their therapeutic progress. Therefore, it is essential that therapists who work with ASCs are equipped with the skills and knowledge to manage these risks effectively (Grof & Grof, 2010).

Informed consent is another critical ethical consideration when integrating ASCs into therapy. Clients must fully understand the nature of the altered states they will experience, including the potential risks and benefits. This requires therapists to provide clear information about the techniques used to induce ASCs, the possible emotional and psychological effects, and the steps that will be taken to ensure client safety (Johnson et al., 2019). Clients should also be encouraged to ask questions and express any concerns they may have before engaging in practices that induce ASCs. By ensuring that clients are well-informed and actively involved in the decision-making process, therapists can help create a therapeutic environment that is both safe and empowering for clients.

Additionally, cultural sensitivity is an important ethical consideration when working with ASCs in therapy. Different cultural and spiritual traditions have varying interpretations of altered states and their significance. For example, indigenous cultures may view ASCs as sacred experiences that connect individuals with the spiritual realm (Winkelman, 2011). Therapists must be aware of and respect the cultural backgrounds and spiritual beliefs of their clients when incorporating ASCs into therapy. This requires a deep understanding of the cultural context in which ASCs are used and a commitment to honoring the client’s personal and spiritual journey. By integrating cultural sensitivity into therapeutic practice, therapists can foster an inclusive and respectful therapeutic environment that supports the client’s unique path to healing and self-transcendence (Pargament, 2007).

Long-Term Impacts of ASC-Induced Self-Transcendence

The long-term impacts of altered states of consciousness (ASCs) on self-transcendence and psychological well-being are significant and well-documented. Research suggests that experiences of self-transcendence facilitated by ASCs can lead to lasting improvements in emotional regulation, life satisfaction, and overall mental health (MacLean et al., 2011). Individuals who undergo profound ASC-induced experiences often report feeling more connected to others, a greater sense of purpose, and increased psychological resilience (Griffiths et al., 2006). These long-term benefits are particularly evident in individuals who regularly engage in practices that induce ASCs, such as meditation, breathwork, or psychedelic-assisted therapy.

One of the most notable long-term effects of ASC-induced self-transcendence is the reduction of existential anxiety and fear of death. Experiences of ego dissolution and interconnectedness, often reported during ASCs, can lead to a fundamental shift in how individuals perceive life and death (Yaden et al., 2017). Many individuals who have undergone ASCs describe a greater acceptance of death and a reduced fear of mortality, which can lead to increased emotional well-being and a more positive outlook on life (Griffiths et al., 2008). This shift in perspective is particularly beneficial for individuals dealing with end-of-life issues or those experiencing existential distress.

The long-term impact of ASCs is also seen in enhanced personal growth and self-actualization. Individuals who regularly experience ASCs often report an increased capacity for self-reflection, empathy, and a deeper sense of meaning and purpose in life (Maslow, 1971). Research on psychedelic therapy, for instance, has shown that individuals who undergo psychedelic-assisted sessions often experience enduring changes in personality, such as increased openness to new experiences and greater emotional depth (MacLean et al., 2011). Similarly, individuals who practice meditation and other ASC-inducing techniques often experience long-term improvements in emotional regulation, stress management, and overall psychological well-being (Sedlmeier et al., 2012). These findings underscore the potential for ASCs to promote lasting psychological and spiritual transformation, making them valuable tools in the pursuit of self-transcendence and personal growth.

Conclusion

Altered states of consciousness (ASCs) have proven to be powerful catalysts for self-transcendence and psychological transformation, offering individuals a means to transcend their ordinary sense of self and connect with deeper layers of consciousness. Through various practices such as meditation, breathwork, and the use of psychedelics, individuals can enter states of expanded awareness, ego dissolution, and interconnectedness, facilitating profound personal and spiritual growth (Carhart-Harris et al., 2014; Griffiths et al., 2006). These altered states provide access to non-ordinary experiences that disrupt habitual cognitive patterns, allowing for greater self-awareness, emotional healing, and the experience of unity with others and the universe (Vaitl et al., 2005). The diverse range of ASCs underscores their significance across different cultural, spiritual, and therapeutic settings, highlighting their universal relevance in the human quest for meaning and transcendence.

The integration of ASCs into psychotherapeutic practice further demonstrates their therapeutic potential. Techniques such as holotropic breathwork and psychedelic-assisted therapy have been shown to facilitate deep emotional healing and psychological integration, offering new avenues for addressing trauma, depression, and anxiety (Grof & Grof, 2010; Johnson et al., 2019). By inducing ASCs in a controlled and supportive therapeutic setting, individuals can safely explore and process repressed emotions, gain new insights into their life experiences, and achieve lasting psychological well-being. However, the use of ASCs in therapy also raises important ethical considerations, including the need for informed consent, proper therapist training, and cultural sensitivity (Brewerton et al., 2012). When these factors are carefully considered, ASCs can be responsibly and effectively integrated into therapeutic practice to support self-transcendence and personal transformation.

Looking ahead, further research is needed to explore the long-term psychological and neurobiological impacts of ASCs on self-transcendence. As neuroscience continues to uncover the mechanisms through which ASCs alter brain function and facilitate self-transcendence, a deeper understanding of their therapeutic potential will emerge (MacLean et al., 2011). Additionally, more studies are required to examine the role of ASCs in diverse cultural contexts, as well as their applications in treating specific mental health conditions. As our understanding of ASCs evolves, it is clear that they hold immense promise for enhancing psychological well-being and fostering a more holistic approach to mental health, one that embraces the interconnectedness of mind, body, and spirit.

Bibliography

  1. Brewer, J. A., Worhunsky, P. D., Gray, J. R., Tang, Y. Y., Weber, J., & Kober, H. (2011). Meditation experience is associated with differences in default mode network activity and connectivity. Proceedings of the National Academy of Sciences, 108(50), 20254-20259. https://doi.org/10.1073/pnas.1112029108
  2. Brewerton, T. D., Eyerman, J. E., Cappetta, P., & Mithoefer, M. C. (2012). Long-term psychological and physiological effects of MDMA-assisted psychotherapy in subjects with PTSD. Journal of Psychoactive Drugs, 44(1), 27-40. https://doi.org/10.1080/02791072.2012.662859
  3. Carhart-Harris, R. L., & Nutt, D. J. (2018). Serotonin and brain function: a tale of two receptors. Journal of Psychopharmacology, 32(10), 1091-1096. https://doi.org/10.1177/0269881118780711
  4. Carhart-Harris, R. L., Erritzoe, D., Williams, T., Stone, J. M., Reed, L. J., Colasanti, A., … & Nutt, D. J. (2012). Neural correlates of the psychedelic state as determined by fMRI studies with psilocybin. Proceedings of the National Academy of Sciences, 109(6), 2138-2143. https://doi.org/10.1073/pnas.1119598109
  5. Carhart-Harris, R. L., Friston, K. J., & Nutt, D. J. (2014). Default-mode network activity and psychedelic experience: Implications for the mechanisms of self-awareness and ego-dissolution. Frontiers in Human Neuroscience, 8, 20. https://doi.org/10.3389/fnhum.2014.00020
  6. Carr, D. (1982). Pathophysiology of stress-induced limbic lobe dysfunction: A hypothesis for NDEs. Anabiosis: The Journal of Near-Death Studies, 2(1), 75-89.
  7. Fredrickson, B. L., Cohn, M. A., Coffey, K. A., Pek, J., & Finkel, S. M. (2008). Open hearts build lives: Positive emotions, induced through loving-kindness meditation, build consequential personal resources. Journal of Personality and Social Psychology, 95(5), 1045-1062. https://doi.org/10.1037/a0013262
  8. Freud, S. (1900). The interpretation of dreams. Macmillan.
  9. Friedman, H. L., & Hartelius, G. (2013). The Wiley-Blackwell handbook of transpersonal psychology. Wiley-Blackwell.
  10. Greyson, B. (2000). Near-death experiences. In E. Cardeña, S. J. Lynn, & S. C. Krippner (Eds.), Varieties of anomalous experience: Examining the scientific evidence (pp. 315-352). American Psychological Association.
  11. Greyson, B. (2003). Incidence and correlates of near-death experiences in a cardiac care unit. General Hospital Psychiatry, 25(4), 269-276. https://doi.org/10.1016/S0163-8343(03)00051-5
  12. Griffiths, R. R., Richards, W. A., McCann, U., & Jesse, R. (2006). Psilocybin can occasion mystical-type experiences having substantial and sustained personal meaning and spiritual significance. Psychopharmacology, 187(3), 268-283. https://doi.org/10.1007/s00213-006-0457-5
  13. Griffiths, R. R., Richards, W. A., McCann, U., & Jesse, R. (2011). Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness. Journal of Psychopharmacology, 25(11), 1453-1461. https://doi.org/10.1177/0269881111420188
  14. Grof, S. (2000). Psychology of the future: Lessons from modern consciousness research. SUNY Press.
  15. Grof, S., & Grof, C. (2010). Holotropic breathwork: A new approach to self-exploration and therapy. SUNY Press.
  16. Hilgard, E. R. (1977). Divided consciousness: Multiple controls in human thought and action. Wiley.
  17. Hood, R. W. (2002). The relationship between spontaneous and religiously triggered experiences of unity. In M. de Sousa & W. P. Mikulas (Eds.), The psychology of religion (pp. 131-144). Kluwer Academic.
  18. Johnson, M. W., Griffiths, R. R., Hendricks, P. S., & Henningfield, J. E. (2019). The abuse potential of medical psilocybin according to the 8 factors of the controlled substances act. Neuropharmacology, 142, 143-166. https://doi.org/10.1016/j.neuropharm.2018.05.012
  19. Jung, C. G. (1961). Memories, dreams, reflections. Pantheon Books.
  20. Kabat-Zinn, J. (2003). Mindfulness-based interventions in context: Past, present, and future. Clinical Psychology: Science and Practice, 10(2), 144-156. https://doi.org/10.1093/clipsy.bpg016
  21. Lazar, S. W., Bush, G., Gollub, R. L., Fricchione, G. L., Khalsa, G., & Benson, H. (2000). Functional brain mapping of the relaxation response and meditation. NeuroReport, 11(7), 1581-1585.
  22. Lebedev, A. V., Lövdén, M., Rosenthal, G., Feilding, A., Nutt, D. J., & Carhart-Harris, R. L. (2015). Finding the self by losing the self: Neural correlates of ego-dissolution under psilocybin. Human Brain Mapping, 36(8), 3137-3153. https://doi.org/10.1002/hbm.22833
  23. Letheby, C. (2020). Philosophy of psychedelics. Philosophy Compass, 15(4), e12658. https://doi.org/10.1111/phc3.12658
  24. Lutz, A., Greischar, L. L., Rawlings, N. B., Ricard, M., & Davidson, R. J. (2008). Long-term meditators self-induce high-amplitude gamma synchrony during mental practice. Proceedings of the National Academy of Sciences, 101(46), 16369-16373. https://doi.org/10.1073/pnas.0407401101
  25. MacLean, K. A., Johnson, M. W., & Griffiths, R. R. (2011). Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness. Journal of Psychopharmacology, 25(11), 1453-1461. https://doi.org/10.1177/0269881111420188
  26. Maslow, A. H. (1971). The farther reaches of human nature. Viking Press.
  27. Metzner, R. (2005). Psychedelic, mystical, and visionary experiences. In B. P. Wolman (Ed.), Handbook of altered states of consciousness (pp. 92-104). Van Nostrand Reinhold.
  28. Nichols, D. E. (2016). Psychedelics. Pharmacological Reviews, 68(2), 264-355. https://doi.org/10.1124/pr.115.011478
  29. Nour, M. M., Evans, L., Nutt, D., & Carhart-Harris, R. L. (2016). Ego-dissolution and psychedelics: Validation of the ego-dissolution inventory (EDI). Frontiers in Human Neuroscience, 10, 269. https://doi.org/10.3389/fnhum.2016.00269
  30. Pargament, K. I. (2007). Spiritually integrated psychotherapy: Understanding and addressing the sacred. Guilford Press.
  31. Ring, K. (1984). Heading toward Omega: In search of the meaning of the near-death experience. William Morrow & Co.
  32. Scotton, B. W., Chinen, A. B., & Battista, J. R. (1996). Textbook of transpersonal psychiatry and psychology. Basic Books.
  33. Sedlmeier, P., Eberth, J., Schwarz, M., Zimmermann, D., Haarig, F., Jaeger, S., & Kunze, S. (2012). The psychological effects of meditation: A meta-analysis. Psychological Bulletin, 138(6), 1139-1171. https://doi.org/10.1037/a0028168
  34. Tart, C. T. (2001). States of consciousness. iUniverse.
  35. Vaitl, D., Birbaumer, N., Gruzelier, J., Jamieson, G. A., Kotchoubey, B., Kübler, A., … & Weiss, T. (2005). Psychobiology of altered states of consciousness. Psychological Bulletin, 131(1), 98-127. https://doi.org/10.1037/0033-2909.131.1.98
  36. Vollenweider, F. X., & Kometer, M. (2010). The neurobiology of psychedelic drugs: implications for the treatment of mood disorders. Nature Reviews Neuroscience, 11(9), 642-651. https://doi.org/10.1038/nrn2884
  37. Wilber, K. (2000). Integral psychology: Consciousness, spirit, psychology, therapy. Shambhala Publications.
  38. Winkelman, M. (2011). A paradigm for understanding altered consciousness: The integrative mode of consciousness. In E. Cardeña & M. Winkelman (Eds.), Altering consciousness: Multidisciplinary perspectives (Vol. 1, pp. 23-42). Praeger.
  39. Yaden, D. B., Haidt, J., Hood, R. W., Vago, D. R., & Newberg, A. B. (2017). The varieties of self-transcendent experience. Review of General Psychology, 21(2), 143-160. https://doi.org/10.1037/gpr0000102