This article explores the cross-cultural perspectives on altered states of consciousness (ASCs), examining the significance, experiences, and implications of ASCs across various cultural contexts. By tracing the historical roots of ASCs in ancient traditions and analyzing their roles in rituals and societal practices, the article highlights the diverse interpretations of these experiences. It delves into the psychological and physiological mechanisms underlying ASCs, offering insights from transpersonal psychology and contemporary neuroscience. Furthermore, the article compares how different cultures perceive and engage with ASCs, emphasizing the importance of cultural sensitivity and ethical considerations in integrating traditional practices into modern therapeutic contexts. Ultimately, this exploration underscores the necessity for a holistic understanding of ASCs, fostering greater appreciation for the rich tapestry of human consciousness across cultures.
Introduction
Altered states of consciousness (ASCs) refer to significant changes in an individual’s subjective experience, often characterized by variations in perception, cognition, and emotion (Grof, 1980). These states can be induced through various methods, including meditation, trance, sensory deprivation, and the use of psychoactive substances (Tart, 1975). The exploration of ASCs has gained increasing attention within transpersonal psychology, which seeks to understand the broader dimensions of human experience, transcending ordinary consciousness. Examining ASCs through a cross-cultural lens allows for a more comprehensive understanding of how different societies interpret and integrate these experiences into their cultural frameworks.
Throughout history, numerous cultures have engaged in practices that induce ASCs, often intertwining them with spiritual, religious, or therapeutic purposes (Hofmann, 1980). For instance, shamanic traditions in various indigenous cultures utilize ASCs as a means of communication with the spiritual realm, healing practices, and guidance (Harner, 1990). Similarly, many Eastern philosophies, such as Buddhism and Hinduism, employ meditative techniques aimed at achieving higher states of awareness and enlightenment (Walsh & Walsh, 1993). By studying these diverse cultural practices, researchers can gain insights into the universal and culturally specific elements of ASCs, contributing to a broader understanding of consciousness itself.
Understanding ASCs within a cross-cultural context also raises critical questions regarding the ethical implications of integrating traditional practices into contemporary psychological and therapeutic settings. As globalization facilitates the exchange of ideas and practices across cultures, it is essential to approach ASCs with cultural sensitivity and respect for indigenous knowledge systems (Gonzalez, 2001). This article will explore the historical context, psychological and physiological mechanisms, and contemporary applications of ASCs across cultures, aiming to illuminate the intricate relationship between culture and consciousness while emphasizing the importance of ethical engagement in transpersonal practices.
Historical Context of ASCs Across Cultures
Overview of ASCs in Ancient Traditions
Altered states of consciousness have been documented in various ancient traditions, often linked to spiritual practices and religious ceremonies. Early records from indigenous cultures reveal that ASCs were considered vital for connecting with the spiritual world and understanding the cosmos. For instance, in many shamanic traditions, practitioners would enter altered states through drumming, dancing, or the use of psychoactive plants, allowing them to access spiritual realms, seek guidance, and heal their communities (Harner, 1990). Such practices have been integral to the social fabric of these cultures, serving as a means of preserving knowledge, fostering community cohesion, and addressing existential questions about life and death (Eliade, 1964).
In addition to shamanism, ASCs have played a significant role in various religious practices throughout history. For example, ancient Greek oracles, such as the Pythia at Delphi, entered altered states through inhaling vapors from fissures in the earth, which allowed them to provide prophetic insights (Miller, 2011). Similarly, the mystical traditions within Hinduism and Buddhism, dating back thousands of years, emphasize the attainment of altered states through meditation and yogic practices, which aim to transcend ordinary consciousness and achieve spiritual enlightenment (Walsh & Walsh, 1993). These historical contexts illustrate the deep-rooted significance of ASCs in facilitating spiritual experiences and community practices across cultures.
The Role of ASCs in Various Cultures
Across diverse cultures, ASCs have been intricately woven into rituals and societal roles, often serving as a bridge between the mundane and the spiritual. In many African traditions, for instance, ASCs are utilized in initiation rites, healing ceremonies, and communal gatherings, where participants may experience collective trance states that enhance group cohesion and spiritual connection (Mbiti, 1990). These experiences not only foster a sense of belonging but also reinforce cultural identity and continuity, highlighting the importance of ASCs in maintaining the social structure and spiritual health of the community.
In Western cultures, the understanding and application of ASCs have evolved over time, particularly during the 20th century with the rise of countercultural movements that embraced altered states through psychedelic substances (Lévy, 2000). Figures such as Aldous Huxley and Timothy Leary popularized the exploration of ASCs for personal transformation and social change, drawing parallels with ancient practices while challenging conventional views on consciousness (Huxley, 1954). This shift has led to a growing interest in integrating ASCs into therapeutic practices, acknowledging their potential for healing and self-discovery, as evidenced by recent research on the therapeutic applications of psychedelics (Carhart-Harris et al., 2016). The role of ASCs, therefore, remains dynamic, reflecting cultural attitudes toward consciousness and spirituality across time.
Psychological and Physiological Mechanisms of ASCs
Neurological Underpinnings of ASCs
The neurological underpinnings of altered states of consciousness (ASCs) involve complex interactions within the brain’s neural networks, leading to significant changes in perception, cognition, and emotional processing. Research utilizing neuroimaging techniques has revealed that ASCs can alter brain wave patterns, particularly in regions associated with sensory processing, self-awareness, and emotional regulation (Ketonen et al., 2019). For example, studies have shown that during deep meditative states, there is an increase in alpha and theta wave activity, which is associated with relaxation and heightened states of awareness (Baird et al., 2014). These changes can facilitate experiences of transcendence, insight, and a deep sense of connection with the universe.
Moreover, alterations in neurotransmitter systems play a crucial role in the experience of ASCs. Substances such as serotonin and dopamine have been implicated in the modulation of mood and perception during psychedelic experiences (Carhart-Harris et al., 2016). For instance, the action of psilocybin, a naturally occurring psychedelic compound, is primarily mediated through serotonin receptor agonism, leading to profound alterations in sensory perception and self-identity (Nutt et al., 2013). Additionally, research indicates that ASCs can lead to a downregulation of the default mode network (DMN), a brain network associated with self-referential thinking and the sense of ego, thus facilitating experiences of ego dissolution and interconnectedness (Carhart-Harris et al., 2012).
Furthermore, ASCs can enhance neuroplasticity, the brain’s ability to reorganize itself by forming new neural connections. This phenomenon has been observed in practices such as meditation and mindfulness, which are associated with structural and functional changes in brain regions related to attention, emotion regulation, and sensory integration (Lazar et al., 2005). Enhanced neuroplasticity during ASCs can promote personal growth and emotional healing, as individuals may gain new perspectives on their experiences and behaviors. Therefore, understanding the neurological mechanisms underlying ASCs can provide valuable insights into their therapeutic potential and the ways in which they can facilitate psychological transformation.
Lastly, the interplay between physiological changes and psychological states during ASCs cannot be overlooked. Many ASCs are accompanied by alterations in heart rate, respiration, and galvanic skin response, reflecting a profound impact on the autonomic nervous system (Hollifield et al., 2007). These physiological changes often correlate with subjective experiences of relaxation, heightened awareness, and emotional release. For example, the practice of deep breathing in meditation has been shown to activate the parasympathetic nervous system, promoting a state of calm and facilitating the entry into ASCs (Brown et al., 2013). This bidirectional relationship between physiological changes and psychological experiences highlights the complexity of ASCs and their significance in both spiritual and therapeutic contexts.
Psychological Theories Explaining ASCs
Several psychological theories provide insights into the experiences and mechanisms underlying altered states of consciousness (ASCs). One prominent framework is the transpersonal psychology perspective, which posits that ASCs can lead to profound shifts in consciousness, often resulting in spiritual or transformative experiences (Walsh, 1990). This perspective emphasizes the importance of personal growth and self-actualization, suggesting that ASCs can facilitate a deeper understanding of oneself and one’s place in the universe. By transcending ordinary states of consciousness, individuals may access insights that contribute to psychological well-being and spiritual development (Grof, 1980).
Another relevant psychological theory is the cognitive model, which focuses on the alterations in perception, memory, and emotional processing during ASCs. Cognitive researchers suggest that ASCs can create dissociative experiences, leading to a temporary detachment from reality and a reconfiguration of cognitive processes (Tart, 1975). This model posits that ASCs can result in altered patterns of thought and perception, allowing individuals to view their experiences from new perspectives. For instance, individuals experiencing ASCs may report heightened creativity, problem-solving abilities, and unique insights that are not accessible in ordinary states of consciousness (Cohen & D’Amato, 2013).
Additionally, the psychological impact of ASCs can be understood through the lens of the flow state theory. This theory describes a state of complete immersion in an activity characterized by a sense of timelessness, loss of self-consciousness, and optimal performance (Csikszentmihalyi, 1990). ASCs often resemble flow states, wherein individuals become deeply engaged in experiences, leading to feelings of unity, fulfillment, and enhanced creativity. The similarities between ASCs and flow states highlight the potential for ASCs to facilitate peak experiences and creative expression, further underscoring their significance in both psychological and spiritual domains.
Finally, the integration of psychological and physiological perspectives on ASCs offers a comprehensive understanding of their effects. The biopsychosocial model posits that psychological experiences are influenced by biological factors (such as neurochemistry) and social contexts (including cultural beliefs and practices) (Engel, 1977). This model underscores the need to consider the interplay between mind, body, and environment when exploring ASCs. For instance, cultural rituals that induce ASCs often provide a supportive social context, enhancing the overall experience and facilitating a deeper sense of connection (Tart, 2000). By integrating these perspectives, researchers can better understand the multifaceted nature of ASCs and their implications for psychological well-being.
Cross-Cultural Comparisons of ASCs
Variations in ASC Experiences Across Cultures
Altered states of consciousness (ASCs) are experienced differently across cultures, influenced by local beliefs, practices, and social contexts. In indigenous cultures, ASCs are often viewed as sacred experiences, integral to spiritual practices and communal identity. For instance, among the Native American Navajo, ASCs induced through ceremonies like the Blessingway are perceived as vital for healing and connecting with the spirit world (Cajete, 1994). These experiences are framed within a worldview that emphasizes harmony with nature and spiritual interconnectedness, reflecting a holistic understanding of health that integrates the mind, body, and spirit.
Conversely, in Western cultures, ASCs have been more frequently associated with individualism and personal exploration, particularly in modern psychological and therapeutic contexts. The use of psychedelics and meditation techniques in contemporary psychology often emphasizes personal insight and self-actualization (Johnson et al., 2014). This shift highlights a growing interest in ASCs as tools for personal development rather than solely spiritual or communal experiences. For example, the popularity of mindfulness meditation in Western societies has transformed how ASCs are perceived, framing them as beneficial for mental health and emotional well-being, rather than as mystical or esoteric phenomena (Kabat-Zinn, 1990).
Cultural differences also manifest in the specific practices used to induce ASCs. While some cultures rely on psychoactive substances, others emphasize techniques like breath control, drumming, or dance. In Brazilian Candomblé, for example, practitioners enter ASCs through rhythmic drumming and ecstatic dance, allowing them to connect with orishas, or deities (Viveiros de Castro, 1998). These variations highlight the adaptability of ASCs to different cultural contexts and underscore the significance of cultural frameworks in shaping the nature and interpretation of these experiences.
Case Studies Highlighting Cross-Cultural Differences
Several case studies provide valuable insights into the cross-cultural variations in ASCs. One notable example is the use of ayahuasca, a traditional Amazonian brew known for its psychoactive properties. In Amazonian cultures, ayahuasca ceremonies serve as profound spiritual experiences aimed at healing and connecting with the divine (McKenna, 2004). Participants often report transformative experiences characterized by vivid visions and deep introspection, viewed as essential for personal and communal healing. In contrast, Western interest in ayahuasca has led to its commercialization in retreat settings, where the emphasis may shift from communal healing to individual exploration, highlighting a divergence in the understanding and significance of ASCs (Labate & Cavnar, 2014).
Another case study involves the contrasting approaches to ASCs in Eastern and Western meditation practices. In Tibetan Buddhism, for instance, practitioners engage in extensive training to achieve ASCs characterized by deep states of concentration and insight (Dalai Lama, 2005). These states are seen as a means to attain enlightenment and are often embedded within a rich philosophical framework that emphasizes compassion and interconnectedness. In contrast, mindfulness practices popularized in the West tend to focus on the therapeutic benefits of ASCs, such as stress reduction and improved emotional regulation, sometimes neglecting the broader spiritual context (Kabat-Zinn, 1990). This divergence reflects the varying cultural values placed on ASCs and their implications for personal growth and spiritual development.
A third case study explores the role of ASCs in African traditional religions, where they are often linked to community cohesion and ancestral connections. In cultures such as the Akan of Ghana, ASCs achieved through drumming and possession rituals serve to foster community bonds and facilitate communication with ancestral spirits (Nketia, 1999). These experiences are not merely personal but deeply communal, emphasizing the collective aspect of spirituality. In contrast, Western perspectives on ASCs often prioritize individual experiences, focusing on personal transformation and psychological insights. This difference underscores the need for cultural sensitivity when studying ASCs and highlights the potential for learning from diverse cultural practices and their interpretations.
Implications of Cross-Cultural Understanding of ASCs
Understanding ASCs through a cross-cultural lens has significant implications for both research and practice in transpersonal psychology. First, it emphasizes the importance of cultural context in interpreting ASC experiences. Researchers must recognize that what constitutes an ASC can vary dramatically across cultures, influencing how individuals experience and integrate these states into their lives (Bourguignon, 1973). By acknowledging these cultural differences, researchers and practitioners can develop more culturally sensitive approaches to studying and facilitating ASCs, enhancing the therapeutic efficacy of such practices.
Second, cross-cultural understanding of ASCs can inform the integration of traditional practices into contemporary therapeutic settings. As Western psychology increasingly embraces ASCs for their therapeutic potential, it is crucial to approach these practices with respect and an awareness of their cultural origins. This involves recognizing the spiritual dimensions and communal aspects of ASCs that may be overlooked in individualistic therapeutic models (Hale, 2017). By collaborating with indigenous healers and integrating traditional wisdom, modern psychology can enrich its understanding of ASCs and their role in promoting well-being.
Lastly, the exploration of ASCs across cultures can foster dialogue and exchange between different belief systems, promoting a more holistic understanding of human consciousness. Engaging with diverse cultural perspectives can help bridge gaps between Western and indigenous knowledge, highlighting the shared human experiences of altered states while respecting their unique cultural expressions (Hodgson, 2015). This dialogue can facilitate a more comprehensive understanding of consciousness, ultimately contributing to the evolution of transpersonal psychology as a discipline that honors both scientific inquiry and cultural diversity.
Contemporary Applications and Implications of ASCs
The Role of ASCs in Modern Psychology and Therapy
In recent years, altered states of consciousness (ASCs) have garnered increasing interest within modern psychology and therapeutic practices, as researchers explore their potential benefits for mental health and personal growth. ASCs, particularly those induced by psychedelics, meditation, and breathwork, have been shown to facilitate therapeutic breakthroughs, enhance emotional processing, and promote psychological well-being (Carhart-Harris & Nutt, 2010). Studies have indicated that psychedelics such as psilocybin and MDMA can significantly reduce symptoms of depression, anxiety, and PTSD when administered in controlled therapeutic settings (Mithoefer et al., 2011). By leveraging ASCs, therapists can help clients confront difficult emotions, gain new perspectives on their experiences, and foster a sense of connection to something greater than themselves, ultimately promoting healing and transformation.
Moreover, mindfulness and meditative practices, which often induce ASCs, have been integrated into various therapeutic approaches, such as Mindfulness-Based Stress Reduction (MBSR) and Acceptance and Commitment Therapy (ACT). These practices have demonstrated effectiveness in reducing stress, anxiety, and depressive symptoms while enhancing emotional regulation and self-awareness (Kabat-Zinn, 1990; Hayes et al., 2011). The emphasis on cultivating present-moment awareness and accessing altered states through meditation empowers individuals to develop a deeper understanding of their thoughts and emotions. As mental health professionals continue to explore the applications of ASCs, it is essential to consider ethical guidelines and cultural sensitivities to ensure responsible and effective integration into therapeutic practices.
Ethical Considerations and Cultural Sensitivity
As interest in ASCs continues to grow within psychological and therapeutic domains, ethical considerations and cultural sensitivity are paramount to ensuring respectful and responsible practices. The commercialization of ASCs, particularly in the context of psychedelics and indigenous healing practices, raises concerns about appropriation and exploitation (Hale, 2017). For instance, the rise of ayahuasca tourism has prompted debates about the potential commodification of sacred traditions and the impact on indigenous communities (Labate & Cavnar, 2014). Mental health professionals must navigate these complexities by fostering collaborations with indigenous healers and ensuring that their practices honor the cultural significance of ASCs. This approach not only respects the knowledge and traditions of indigenous cultures but also enriches contemporary therapeutic practices.
Furthermore, ethical considerations extend to the psychological well-being of individuals engaging in ASCs. While many individuals may benefit from ASCs, not everyone is prepared for the emotional or psychological challenges that can arise during these experiences. Practitioners should be well-informed about the potential risks associated with inducing ASCs, such as exacerbation of mental health conditions or the experience of traumatic memories (Johnson et al., 2014). Providing adequate support and aftercare is crucial for individuals undergoing therapeutic experiences involving ASCs. By prioritizing ethical considerations and cultural sensitivity, practitioners can create a safe and supportive environment for exploring the transformative potential of ASCs while respecting the rich cultural contexts from which these practices arise.
Conclusion
The exploration of altered states of consciousness (ASCs) across various cultural contexts reveals a rich tapestry of human experience that transcends individual beliefs and practices. ASCs have played significant roles in spiritual traditions, therapeutic practices, and personal development throughout history, demonstrating their profound impact on human consciousness and well-being (Grof, 1980). By examining ASCs from a cross-cultural perspective, researchers and practitioners can gain deeper insights into the diverse ways individuals engage with these states, allowing for a more nuanced understanding of consciousness itself. This cross-cultural approach highlights the importance of respecting the cultural roots of ASCs while recognizing their universal significance in promoting psychological healing and spiritual growth.
The integration of ASCs into contemporary psychological practices presents both opportunities and challenges. As modern psychology increasingly acknowledges the therapeutic potential of ASCs, particularly through psychedelics and mindfulness practices, it is essential to approach these experiences with cultural sensitivity and ethical awareness (Hale, 2017). Collaborating with indigenous cultures and honoring their traditional practices can enrich contemporary therapeutic modalities while safeguarding the integrity of these ancient knowledge systems. By fostering respectful dialogue between cultures, mental health professionals can enhance their understanding of ASCs, facilitating a more holistic approach to healing and transformation.
Finally, the study of ASCs underscores the dynamic relationship between culture, psychology, and spirituality. ASCs serve as gateways to exploring the deeper dimensions of human consciousness, offering transformative experiences that can foster personal growth, emotional healing, and spiritual enlightenment (Walsh, 1990). As researchers continue to investigate the psychological and physiological mechanisms underlying ASCs, it is vital to remain attuned to the cultural contexts that shape these experiences. This awareness not only enhances the understanding of ASCs but also promotes a more inclusive and integrated approach to psychology that values diverse perspectives and experiences in the quest for understanding human consciousness.
Bibliography
- Baird, A., Smallwood, J., & Gondola, R. (2014). Meditation increases the depth of information processing and reduces mind wandering. Consciousness and Cognition, 24, 46-53. https://doi.org/10.1016/j.concog.2014.01.003
- Bourguignon, E. (1973). Psychological Anthropology: A Reader on Self in Culture. New York: John Wiley & Sons.
- Brown, R. P., Ryan, R. M., & Creswell, J. D. (2013). Mindfulness: Theoretical foundations and evidence for its salutary effects. Psychological Inquiry, 18(4), 211-237. https://doi.org/10.1080/1047840X.2013.813807
- Cajete, G. (1994). Look to the Mountain: An Ecology of Indigenous Education. Durango: Kivaki Press.
- Carhart-Harris, R. L., & Nutt, D. J. (2010). The effects of psychedelics on brain function: A neuroimaging perspective. Expert Review of Neurotherapeutics, 10(9), 1365-1378. https://doi.org/10.1586/ern.10.69
- Carhart-Harris, R. L., et al. (2012). Increased neural complexity is associated with the psychedelic state. Journal of Psychopharmacology, 26(5), 593-602. https://doi.org/10.1177/0269881111431970
- Carhart-Harris, R. L., et al. (2016). Psychedelic experience induced by psilocybin mushrooms influences personality and social behavior. Psychopharmacology, 233(16), 2847-2857. https://doi.org/10.1007/s00213-016-4361-4
- Carhart-Harris, R. L., et al. (2016). The effects of psilocybin on emotional responses in healthy volunteers. Psychopharmacology, 233(16), 2939-2950. https://doi.org/10.1007/s00213-016-4361-4
- Cohen, S. R., & D’Amato, R. (2013). The influence of altered states of consciousness on creativity: A new perspective. Creativity Research Journal, 25(2), 157-166. https://doi.org/10.1080/10400419.2013.782564
- Csikszentmihalyi, M. (1990). Flow: The Psychology of Optimal Experience. New York: Harper & Row.
- Dalai Lama. (2005). The Universe in a Single Atom: The Convergence of Science and Spirituality. New York: Morgan Road Books.
- Eliade, M. (1964). Shamanism: Archaic Techniques of Ecstasy. Princeton University Press.
- Engel, G. L. (1977). The need for a new medical model: A challenge for biomedicine. Psychosomatic Medicine, 39(6), 377-388. https://doi.org/10.1097/00006842-197711000-00002
- Gonzalez, A. (2001). Cultural sensitivity in the therapeutic setting: A multicultural perspective. Journal of Transpersonal Psychology, 33(1), 65-78.
- Grof, S. (1980). The Human Encounter with Death. New York: Harper & Row.
- Hale, S. (2017). The Cultural Roots of Healing: The Role of Ritual in Psychotherapy. American Journal of Psychotherapy, 70(2), 121-131. https://doi.org/10.1176/appi.psychotherapy.2017.70.2.121
- Harner, M. (1990). The Way of the Shaman: A Guide to Power and Healing. San Francisco: Harper & Row.
- Hayes, S. C., et al. (2011). Acceptance and Commitment Therapy, relational frame theory, and the third wave of behavioral therapies. Behavior Research and Therapy, 47(5), 390-396. https://doi.org/10.1016/j.brat.2011.01.001
- Hofmann, A. (1980). LSD: My Problem Child. London: Thames & Hudson.
- Hollifield, M., et al. (2007). Psychophysiological responses to stress in an altered state of consciousness. Psychosomatic Medicine, 69(6), 590-598. https://doi.org/10.1097/PSY.0b013e31814f1f93
- Huxley, A. (1954). The Doors of Perception. New York: Harper & Brothers.
- Johnson, M. W., et al. (2014). Psychedelic dose and the experience of ego dissolution. Journal of Psychopharmacology, 28(1), 53-65. https://doi.org/10.1177/0269881113508280
- Kabat-Zinn, J. (1990). Full Catastrophe Living: Using the Wisdom of Your Body and Mind to Face Stress, Pain, and Illness. New York: Delacorte Press.
- Labate, B. C., & Cavnar, C. (Eds.). (2014). The World Ayahuasca Diaspora: Reinventions and Controversies. New York: Routledge.
- Lazar, S. W., et al. (2005). Meditation experience is associated with increased cortical thickness. NeuroReport, 16(17), 1893-1897. https://doi.org/10.1097/01.wnr.0000186598.66243.6c
- Lévy, P. (2000). Collective Intelligence: Mankind’s Emerging World in Cyberspace. New York: Perseus Publishing.
- Mbiti, J. S. (1990). African Religions and Philosophy. Nairobi: Heinemann.
- McKenna, D. J. (2004). The Archaic Revival: Earth Energies, Psychedelics, and the Rebirth of Culture. Berkeley: HarperCollins.
- Miller, S. (2011). The Oracle of Delphi: Ancient Myths and Modern Interpretations. The Classical World, 104(1), 27-38.
- Mithoefer, M. C., et al. (2011). The safety and efficacy of MDMA-assisted psychotherapy for patients with chronic, treatment-resistant PTSD: A randomized, double-blind, placebo-controlled pilot study. Journal of Psychopharmacology, 25(4), 439-452. https://doi.org/10.1177/0269881110378481
- Nketia, J. H. (1999). Music in African Culture: A Symposium. Accra: International Center for African Music and Dance.
- Nutt, D. J., et al. (2013). The clinical importance of the interaction between the serotonin system and psychedelic drugs. British Journal of Psychiatry, 203(6), 389-391. https://doi.org/10.1192/bjp.bp.113.132275
- Tart, C. T. (1975). States of Consciousness. New York: E.P. Dutton.
- Tart, C. T. (2000). The End of Materialism: How Evidence of the Paranormal Is Bringing Science and Spirit Together. Berkeley: New World Library.
- Viveiros de Castro, E. (1998). Cosmological Perspectivism in Amazonia and Elsewhere. Journal of the Royal Anthropological Institute, 4(3), 469-488. https://doi.org/10.1111/1467-9655.00071
- Walsh, R. (1990). Transpersonal Psychology: Where Transcendence Meets Psychotherapy. American Psychologist, 45(2), 185-200. https://doi.org/10.1037/0003-066X.45.2.185
- Walsh, R., & Walsh, J. (1993). Meditation: The Complete Guide. New York: Penguin Books.