The Historical Roots and Contemporary Convergence of Existential Therapy and Neuroscience

Existential therapy, a profound approach to understanding the human condition, draws its name from the Latin verb existere, meaning "to exist," to "stand out," or "come into being." This adjective, "existential," fundamentally addresses the nature and meaning of human existence itself—what it means to live, to die, to experience joy and suffering, love and loss. These profound aspects of human life, it posits, cannot be fully grasped through purely objective or rational analysis but are deeply rooted in lived experience. The rich tapestry of existential thought has a long and complex history, weaving together philosophical inquiry, literary expression, and psychological exploration.

The Genesis of Existential Thought and Therapy

The earliest explorations of the fundamental promises and perplexities of human existence can be found in the romantic poetry and literature of luminaries such as Johann Wolfgang von Goethe, Friedrich Hölderlin, Fyodor Dostoevsky, Henrik Ibsen, and Leo Tolstoy. These artists, through their profound insights into the human psyche, laid early groundwork for understanding the subjective realities of life. However, the formal philosophical underpinnings of existentialism began to take shape with the works of proto-existential thinkers like Arthur Schopenhauer, Søren Kierkegaard, and Friedrich Nietzsche in the 19th century.

While these figures are widely recognized, two less commonly cited but critically important 19th-century German thinkers, Franz Brentano and Wilhelm Dilthey, provided indispensable epistemological foundations for existential inquiry. Brentano, a psychologist and philosopher, introduced the concept of intentionality—the idea that consciousness is always directed toward an object. His work, particularly Psychology from an Empirical Standpoint (1874), significantly influenced both Sigmund Freud and Edmund Husserl, the founder of phenomenology. Brentano’s distinction between genetic psychology (explaining phenomena) and descriptive psychology (understanding phenomena through first-person accounts) resonated deeply with the existential focus on subjective experience.

Wilhelm Dilthey, a contemporary of Brentano, further distinguished between the natural sciences (Naturwissenschaften) and the human sciences (Geisteswissenschaften, or "sciences of the spirit"). This crucial distinction forms a philosophical bedrock for understanding existential therapy. Dilthey argued that while natural sciences aim to explain phenomena through objective observation and the establishment of causal laws, the human sciences strive to understand the meaning of historically situated, irreplicable lived experiences (Erlebnis). He famously stated, "We explain nature, we understand the life of the soul." This emphasis on understanding and interpretation, rather than mere explanation, is central to the existential therapeutic approach. Dilthey’s work on hermeneutics, the science and art of human understanding, provided a methodological framework for the human sciences, emphasizing that human beings must be understood not only as biological organisms but also as subjects with psychological, social, mental, moral, and spiritual dimensions.

The Rise of Existential Philosophy and Psychotherapy

The turn of the 20th century witnessed a significant intellectual ferment that propelled existential philosophy and psychotherapy into prominence. The death of Nietzsche in 1900, the publication of Freud’s The Interpretation of Dreams in the same year, Husserl’s introduction of phenomenology with Logical Investigations (1900-1901), and Dilthey’s influential The Rise of Hermeneutics (1900) collectively marked a paradigm shift in the study of the human mind in Europe.

Karl Jaspers, a psychiatrist turned philosopher, was among the first to apply Husserl’s phenomenology to psychopathology, detailing his insights in General Psychopathology (1913). Heavily influenced by Kierkegaard and Nietzsche, Jaspers articulated a coherent philosophy of human existence, Existenzphilosophie. The mid-20th century saw a proliferation of influential thinkers and writers who embraced phenomenology in their work, including philosophers like Jean-Paul Sartre, Albert Camus, and Gabriel Marcel, and psychiatrists such as Ludwig Binswanger, Medard Boss, Viktor Frankl, R.D. Laing, and Franz Fanon. These figures collectively shaped the landscape of existential thought and its therapeutic applications.

The Compatibility of Science and Existential Psychology

A recurring theme in existential psychology is the differentiation between the methods of the natural sciences and those of the human sciences. Existential psychotherapists often express caution regarding the potential for natural science approaches to lead to reductionism, objectification, and a loss of the human element in understanding individuals. This perspective is encapsulated by Rollo May and colleagues (1958), who stated that existential therapy’s endeavor is "to understand man by cutting below the cleavage between subject and object which has bedeviled western thought and science since shortly after the renaissance."

However, a more nuanced view suggests that science itself is predicated on philosophical assumptions that lend it purpose and orientation. The belief that observed reality can reliably inform us about the nature of reality, that reality can be captured through observation and measurement, and that objective reality is governed by natural laws are all foundational assumptions. Paradoxically, some critics argue that existential psychology, with its focus on concepts often beyond empirical validation, can be perceived as speculative. Yet, devout existentialists would counter that their aim is to "aspire to greater empiricism than that which the natural sciences can achieve alone." Their prime objective is to adhere to the immediately given phenomena of human experience, to remain with undistorted perceptions, and to allow these phenomena to reveal their essence and meanings.

This perspective suggests that a comprehensive understanding of human existence necessitates integrating the ontological (the nature of being) with the ontic (the concrete reality), the immeasurable with the measurable. Medard Boss highlights that the very word "phenomena" originates from phainesthai, meaning "to shine forth" or "appear." Phenomena possess multiple layers, and while the scientific method offers one avenue of exploration, phenomenology provides another, engaging with experiences in their raw form, unmediated by interpretive frameworks. The phenomenological technique of "bracketing," for instance, can be a valuable tool for scientists, as the interpretation of evidence often relies on the investigator’s assumptions, including cultural ones about what is meaningful.

Indeed, May himself expressed concern about anti-scientific tendencies within some existential psychology circles. Simultaneously, Carl Rogers, a proponent of the human sciences, was a pioneer in the quantitative study of psychotherapy and received accolades from the American Psychological Association for his scientific contributions. This indicates that positivist methods can indeed complement existential frameworks. The human sciences should not aim to contradict the natural sciences but rather to achieve their distinct aim of studying the human psyche through their own established methodologies. Science, in this context, should serve as a tool for deeper understanding, not as a rigid dogma. Emerging fields like neuroexistentialism propose a convergence of these seemingly disparate domains, seeking to bridge the gap between neurological processes and existential experience.

Existential Narrative: Potentiality and the Human Condition

In the existentialist view, human beings are understood as interconnected potentials unfolding across time and space. Rollo May described "being" as a "pattern of potentialities," akin to coordinated patterns of energy and information in physics, continuously actualized through the dimensions of time and space. A primary driving force for humans is the realization of this potential. Many human conflicts can be conceptualized through this lens: the natural unfolding of potential can stagnate, become restricted, or manifest chaotically.

As Rollo May articulated in 1953, "If any organism fails to fulfill its potentialities, it becomes sick, just as your legs would wither if you never walked." This interconnectedness of potential extends to the entire organism. Medard Boss posed three critical questions for understanding an individual’s challenges: (1) How is a person’s freedom to carry out their potentialities impaired? (2) What are these potentialities? And (3) With respect to which entities of the person’s world does this impairment occur?

Existentialists explore these questions within the framework of Mitwelt (with-world or relationships), Umwelt (around-world, encompassing the body and environment), and Eigenwelt (world within oneself). More recently, the Uberwelt (spiritual dimension) has also been incorporated. Existential guilt can arise when individuals feel they are not fulfilling their potential. When severe limitations restrict the expression of potentialities, a person’s sense of self may narrow as a protective mechanism, leading them to accept non-being to preserve the remaining aspects of their existence.

Anxiety, from an existential perspective, is viewed as a fundamental reaction to a perceived danger to one’s existence or to a value identified with one’s existence. It can also stem from a fear of one’s own powers and the conflicts arising from that fear.

The Therapeutic Goal: Realizing Potential and Freedom

The conception of wellbeing in existential therapy centers on the idea of being "a clear, open realm constituted of the ability to perceive and respond." The task of therapy is to allow perceived presences to enter this clarity and unfold their meanings and context. The emphasis is on "being-there as an open realm of time in space," where existential potentialities are realized in the most precise and fitting manner, leading to "composed, relaxed serenity." Happiness, from this viewpoint, is achieved when one is able to realize their essential potentialities.

Medard Boss, who collaborated with Boss, summarized the psychotherapist’s role as a "shepherd or servant of being," tasked with awakening the patient to their "own-most possibilities for being-in-the-world." Rollo May believed the ultimate purpose of psychotherapy was to set individuals free. Existential psychologists define freedom as the capacity to choose within the inherent limits or "existential givens" of life, such as death, separation, culture, and language. Ignoring these limits can lead to problematic relationships with them, either through over-extension or excessive restriction. Denial or over-identification with life’s limits constricts possibilities. Without acknowledging limits, individuals might become hedonistic, viewing others as mere characters in their personal narrative, or conversely, become rigidly conformist, preoccupied with rules.

Existential philosophers consistently emphasize authenticity and confronting life on its own terms, free from self-deception. They argue that a blind acceptance of prevailing intellectual, cultural, and moral climates leads to dysfunction and limits individual potential. Contemporary approaches, such as Kirk Schneider’s Existential-Integrative approach, identify four core therapeutic aims: to help clients become more present to themselves and others; to experience how they mobilize and block themselves from fuller presence; to take responsibility for the construction of their current lives; and to choose or actualize ways of being based on facing, rather than avoiding, existential givens like finiteness, ambiguity, and anxiety.

Disruptions to this inner clarity and attunement can manifest in various ways. Karl Jaspers introduced the concept of "limit situations," while Irvin Yalom identified core existential concerns such as the lack of freedom, isolation, meaninglessness, and death. These inevitabilities of life, alongside sickness, anxiety, loss, and interpersonal conflict, are addressed through diverse existential therapeutic approaches. The convergence of neuropsychological science and existentialist ideas offers a promising avenue for a more comprehensive understanding and treatment of these challenges.

The Interplay of Time and Space in Existential Experience

Our primordial relationship with time and space is fundamental to our existence and can be profoundly impacted by life’s challenges. Psychologically, time can be examined subjectively (phenomenologically), objectively (clock time), and through mental time travel—recalling the past, imagining the future, and experiencing the present. The Default Mode Network (DMN) in the brain, a key network for self-processing, is intricately linked to mental time travel and social cognition, highlighting the interconnectedness of self, time, and relationships. Rollo May’s definition of the self as an "organizing function within the individual and the function by means of which one human being can relate to another" is accurate, but it can be further enriched by recognizing the self’s fundamental relationship to time and its existence as a dynamic process rather than a static entity.

French psychiatrist Minkowski explored the phenomenology of lived time and space, positing that disruptions in temporal experience could be foundational to psychological disturbances, particularly schizophrenia. From his perspective, all psychological disorders arise from distortions in lived time and/or lived space. A patient experiencing a dislocation of present, past, and future illustrates this: life is perceived moment by moment, the present feels like an idea, the past an intrusive hallucination, and the future a mere imagination. Minkowski suggested that the disintegration of perceived lived time can lead to withdrawal from the present and a persistent dwelling on regret.

The modern dilemma, as described by Van Deurzen and colleagues, lies in a societal pressure to constantly perform and produce, leaving little time for enjoyment. Minkowski believed liberation from this could be achieved by rejecting culturally imposed notions of time and embracing a freer, more spontaneous way of living within time. Existentialism’s emphasis on the future over the past is notable; our memories are selectively shaped by our future aspirations, with the future driving the present. Research on prospection indicates that future events are often considered more important to the self than past events. Memories are not static records but are continually re-interpreted in the present, informing future behavior—a process central to the effectiveness of psychotherapy, where troublesome memories are reframed.

Neuropsychological research, particularly Georg Northoff’s spatiotemporal approach, demonstrates how brain activity synchronizes and desynchronizes with the world’s electromagnetic waves, influencing subjective experience and alterations in space and time. In schizophrenia, for instance, abnormal prolongations in intrinsic neural timescales during self-reference have been observed, linking self-disorder and temporal integration. In depression, the future can feel "annihilated," and time may be perceived as moving slower, with an "absence of changes due to the stalling of time in the past."

Beyond the spatiotemporal approach, models like Lanius and Frewen’s four-dimensional model of trauma incorporate the experience of time, noting that traumatized individuals may struggle to engage with the present, feeling stuck in the past. The temporospatial model offers clinicians a framework for tracking neurocognitive and affective activity.

The concept of space is equally integral. Heidegger posits that "Dasein’s ‘there,’ its spatiality, is grounded in the fact that dasein is essentially world-disclosure." Our brains, with their occipital, parietal, and temporal lobes, are intricately involved in visuospatial perception, mental imagery, and object identification, all contributing to our disclosure of the world. Northoff’s work identifies nested hierarchies of space-time, with the deepest layer entwined with the world, forming the foundation for inner experience. Psychotherapeutic goals can include "spatial dilation," an expansion of inner space, manifesting as the capacity to think in multiple dimensions—from pure sensory experience to meta-cognition. This aligns with Vandekerckhove and Panksepp’s phases of consciousness.

Merleau-Ponty highlights that humans are a "world-spanning receptive realm of perception," where psychological proximity and physical distance need not correspond. Existential work’s emphasis on the "here and now" prevents psychic distancing. Repression, in this context, can be re-interpreted not as a defense mechanism but as a strategy to restrict access to inner space to protect oneself from further suffering.

Attunement, the Body, and Embodied Existence

Attunement refers to how the world is disclosed to us based on our mood, influencing our emotional experiences and opening the world in particular ways. Attunement and attention are deeply intertwined. Neuropsychology identifies three systems of attention: alerting, orienting, and executive. The alerting system, linked to arousal, heightens sensory awareness. The orienting system shifts focus to specific stimuli, while the executive system manages conflict resolution and sustained attention. Underpinning these attentional networks are our emotional systems, demonstrating the profound connection between emotion and attention, forming the basis of attunement.

A primary pillar of existentialism, often misunderstood as purely abstract, is the importance of embodiment. The concept of "bodying forth," introduced by Roland Puccetti, suggests that the realization of potential is always expressed through the extension of the body. We are not isolated beings but expressions of the world through our bodies. Scientific evidence increasingly supports this, highlighting the gut-brain axis, the role of the vagus nerve in emotional regulation, and the "4E’s of cognition"—embodied, embedded, enacted, and extended. Merleau-Ponty described humans as "intertwined" with the world, with the body shaping our perceptions and acting as our connection to it.

The gut-brain axis, a bidirectional communication pathway, influences both gastrointestinal and mental health. Altered gut microbiomes are linked to psychotic and affective disorders, affecting neurotransmitter levels like serotonin and dopamine. Friedrich Nietzsche emphasized the body’s role in identifying and interpreting affective states, suggesting that illness and suffering can enhance one’s interpretation of and relation to the world. Merleau-Ponty similarly believed in internal connections where the body senses itself and the world.

The heart-brain axis is another critical example, with heart disease linked to an elevated risk of dementia and cognitive decline. Dysregulation within bodily functions can have detrimental effects across systems. Merleau-Ponty asserted that the body is not a passive vessel but actively influences and is influenced by external factors, sketching out the "movement of existence." The interconnectedness of mind and body is further evidenced by the gut-brain and heart-brain axes, the central nervous system, and the vagal nerve, all relaying information to the brain. The body’s capacity for anticipation and automatic response, known as the feedforward system, operates independently of conscious awareness.

The lived experience of trauma profoundly affects both mind and body. Adverse childhood experiences can alter brain composition, leading to an oversensitive amygdala and increased risk for anxiety and depression. Severe trauma can pose significant health risks, including cardiovascular disease and stroke. The body’s physiological response to stress, the "fight or flight" response, while beneficial in short bursts, can alter physical and neurological processes with repeated activation. Van der Kolk discusses the internalization of trauma, where the body directly interacts with and moves through the world, acting on predictions or reactions.

Treatments for trauma increasingly incorporate bottom-up approaches, focusing on grounding techniques and bringing individuals back into their bodies through mindful awareness of bodily functions like breathing. The Trauma Resiliency Model and Sensorimotor Psychotherapy emphasize human resiliency and the utilization of learning skills to control bodily sensations. Current literature underscores the importance of including the body in treating psychological symptoms, as somatic experiences can give rise to unwanted cognitions and vice versa. These approaches view the body as the connection to the world, and embodiment is fundamental to perceiving, interacting with, and being influenced by the environment. Accepting discomfort and suffering, rather than avoiding them, is key to understanding and treating them.

The Centrality of Relationship and Freedom

A robust finding in therapy research is that the quality of the relationship often surpasses the efficacy of specific techniques. Beyond unconditional positive regard, empathy, and congruence, the therapeutic alliance enables the actualization of strategies leading to enhanced well-being. Attachment research and the general effects of human relationships on the brain demonstrate how interwoven humans are, with the mind extending beyond the brain into the body, environment, and relationships.

The concept of autopoiesis, introduced by Maturana and Varela, describes living systems as relational networks of self-generating processes. From this perspective, both therapist and client are self-organizing, embodied systems whose identities are dynamically maintained and reshaped through engagement with the world. The coupling between therapist and client can create a co-created field with synergistic effects.

Existential and humanistic psychology share a common ground in their view of the practitioner-client relationship as an "honest, respectful relationship between equals." Martin Buber’s concept of I-thou relationships emphasizes the equal personhood of both parties, fostering mutual impact, avoiding agendas, and transcending transactional I-it relationships. This requires authenticity and vulnerability from the therapist. The therapeutic alliance, the therapist as a person, and the social context are often more potent factors than medicalized or technical approaches in psychotherapy.

In an era of advanced technology, the constant availability of communication risks alienation and the endangerment of personal relationships, correlating with overall health and well-being. While technology facilitates connection, the sustainability of deep relationships solely through these means remains a subject of inquiry. The evolving social relationship between humans and artificial intelligence may offer further insights into future human engagement with the social world.

Kirk Schneider’s existential-integrative approach frames freedom as a dynamic balance between constriction and expansion. Individuals may retreat into rigid certainty or unstructured openness to avoid the groundlessness associated with either extreme. True freedom, he argues, emerges from integrating these polarities through careful therapeutic invitations to stay present with denied parts of the self. The "lens of vastness" expands awareness beyond self-imposed limitations, disrupting existential constriction by loosening self-focus and habitual thought loops.

Neuroscientific findings support the role of awe in fostering existential depth by weakening activity in the Default Mode Network (DMN), which regulates self-referential cognition. This momentarily suspends rigid identity structures, allowing for a sense of transcendence. Simultaneously, awe activates the frontoparietal network, enhancing attentional flexibility and perspective-taking. This dual effect—suppressing DMN activity while engaging the frontoparietal network—illustrates how psychological expansion is necessary for existential freedom. Awe serves as a neurocognitive bridge between existential constriction and experiential liberation.

Schneider advocates for engaging with both vastness and intricacy to achieve a full and diversified life. This involves fluidly moving between states of expansion and constriction, embracing life’s complexity without succumbing to existential dread. Awe-based interventions can act as a neural reset, fostering cognitive flexibility and openness.

Transcendence, as described by Jaspers, is the "power through which I am myself," the source of true freedom. It is not about denying the world but integrating and fostering potential within it. While free will remains debated, compatibilist and incompatibilist models abound. Complex systems theory suggests that humans, as hierarchical information processors, can transcend their input and create changes at lower levels—a concept known as recursion. This is reflected in downward causality in neural networks, where higher-order neural states regulate lower-level processes. The non-linear nature of the mind-brain means that consciousness is not solely determined by biology.

Simone de Beauvoir’s existential ethics posits freedom as a negotiation between facticity (given conditions) and transcendence (self-creation through action). Unlike Sartre’s radical autonomy, she argues for freedom’s interdependence and its exercise through ethical engagement with others. Ethical action is not absolute but actively constructed in response to situational constraints. Neuroscientific findings support this, showing that moral reasoning uniquely engages the DMN for perspective-taking and self-other integration. Ethical decision-making under ambiguity activates the salience network and subcortical structures, highlighting the confrontation with the limits of knowledge.

Moral reasoning, when habitual, can diminish reliance on cognitive control regions, transitioning from deliberation to intuition. Beauvoir emphasizes that freedom is action-oriented: "Freedom realizes itself only by engaging itself in the world." This aligns with research showing goal-directed behavior in ethical contexts is shaped by motivation systems, while emotional and social dimensions are mediated by brain regions that integrate affective responses. Higher emotional intelligence enhances ethical engagement. Ambiguity tolerance, emotional affect, and ethical decision-making are intertwined, suggesting that ethical freedom is actively willed into existence.

In conclusion, the history of existential therapy reveals a profound engagement with the fundamental questions of human existence, rooted in philosophical inquiry and expressed through art and literature. The groundbreaking work of thinkers like Brentano and Dilthey laid crucial epistemological foundations. As existentialism evolved, it embraced phenomenological insights and developed into a rich therapeutic approach. The contemporary convergence with neuroscience offers a compelling framework for understanding the biological underpinnings of existential experience, time, space, embodiment, relationships, and freedom, promising a more integrated and holistic approach to human well-being.