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An isolation tank, sensory deprivation tank, float tank, float pod, float cabin, flotation tank, or sensory attenuation tank is a water filled, pitch-black, light-proof, soundproof environment heated to the same temperature as the skin.
The tank is filled with 10 inches (25 cm) of water which contains enough dissolved Epsom salt to create a specific gravity of approximately 1.25–1.26, enabling a person to float freely with their face above the water. In order to reduce thermal sensations, the water in the float tank is maintained at approximately skin temperature, around 35 °C. One typically floats without clothing to minimize tactile sensations, and earplugs are worn during floating both to minimize auditory sensations and to keep Epsom salt out of the ear canal.
Several different tank designs exist. Pod and cabin designs utilize enclosures with doors to enter or exit the tank, whereas pool designs are built from circular fiberglass and lack an enclosure to reduce the risk of claustrophobia. The pool design is housed in a room that is soundproof and lightproof, with tightly controlled ambient air temperature and humidity.
The isolation tank was developed in 1954 by John C. Lilly, a medical practitioner and neuropsychiatrist. [1] [2] [3] During his training in psychoanalysis at the US National Institute of Mental Health (NIMH), Lilly experimented with sensory deprivation. [4]
Widespread commercial interest and use of the isolation tank did not occur until 1972, when Glenn Perry, a computer systems programmer, began selling the first commercial tanks after he attended a five-day workshop by Lilly. [5]
In 1981, there were about $4 million in sales and rentals in the industry, and expectations were that the market would grow, spurred by the film Altered States (a film starring William Hurt as a psychopathologist experimenting with a flotation tank), which came out in 1980. [6] According to one source in the industry, in the 1980s the rise of AIDS and the fear of shared water reduced demand for flotation centers. [7] By 2013, flotation was more popular in Europe than the US, but had undergone some growth in the area around San Francisco; at that time a low-end tank cost about $10,000, and an hour-long flotation session cost about $70. [7]
Use of the float tank has roots in alternative medicine, [8] where its use and promotion occurred largely outside of a scientific framework. Early scientific research on the use of float tanks was stalled by "political activists [who] viewed sensory deprivation as analogous to solitary confinement and torture", thus leading to "hostile publications in the popular media and in professional journals [and] to actual physical violence against researchers." [9] [10]
Flotation has been widely advertised as a form of alternative medicine that has a number of health benefits, but the claims are often exaggerated and poorly evidenced. [8] Despite the lack of scientific support, people have sought treatment from flotation for many conditions including muscle tension, chronic pain, hypertension, and rheumatoid arthritis to PMS. [11]
A 2005 meta-analysis of clinical trials that had been conducted at that time, found that the trials were generally small and highly prone to error, but given that limitation, use of isolation tanks, (called "flotation REST" or "restricted environmental stimulation therapy" in the literature) shows a large effect size (Cohen's d = 1.02) for stress reduction. [12] A 2018 review described flotation-REST as one of "[s]everal emerging technologies [which] may have relevance for interoception and mental health" as it "appears to noninvasively enhance exposure to interoceptive sensations such as the breath and heartbeat". [13]
Scientific research with float tank therapy generally uses the term "flotation-REST" (reduced environmental stimulation therapy) to refer to the technique. [14] [15] This term is preferred over "sensory deprivation" due to the fact that 1) the float tank experience actually enhanced sensory input from the body (e.g., cardiorespiratory sensations) and can also be conceptualized as a form of sensory enhancement [16] and 2) the term "sensory deprivation" carries negative connotations of torture and hallucinations that have likely impeded legitimate research in this field. [15]
John Cunningham Lilly was an American physician, neuroscientist, psychoanalyst, psychonaut, philosopher, writer and inventor. He was a member of a group of counterculture thinkers that included Timothy Leary, Ram Dass, and Werner Erhard, all frequent visitors to the Lilly home. He often stirred controversy, especially among mainstream scientists.
Sensory deprivation or perceptual isolation is the deliberate reduction or removal of stimuli from one or more of the senses. Simple devices such as blindfolds or hoods and earmuffs can cut off sight and hearing, while more complex devices can also cut off the sense of smell, touch, taste, thermoception (heat-sense), and the ability to know which way is down. Sensory deprivation has been used in various alternative medicines and in psychological experiments. When deprived of sensation, the brain attempts to restore sensation in the form of hallucinations.
Autogenic training is a relaxation technique first published by the German psychiatrist Johannes Heinrich Schultz in 1932. The technique involves repetitions of a set of visualisations accompanied by vocal suggestions that induce a state of relaxation and is based on passive concentration of bodily perceptions like heaviness and warmth of limbs, which are facilitated by self-suggestions. Autogenic training is used to alleviate many stress-induced psychosomatic disorders.
Psychonautics refers both to a methodology for describing and explaining the subjective effects of altered states of consciousness, including those induced by meditation or mind-altering substances, and to a research cabal in which the researcher voluntarily immerses themselves into an altered mental state in order to explore the accompanying experiences.
Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye. Some people report CEV under the influence of psychedelics; these are reportedly of a different nature than the "open-eye" hallucinations of the same compounds. Similar hallucinations that occur due to loss of vision are called "visual release hallucinations".
Sensory overload occurs when one or more of the body's senses experiences over-stimulation from the environment.
Sensory processing is the process that organizes and distinguishes sensation from one's own body and the environment, thus making it possible to use the body effectively within the environment. Specifically, it deals with how the brain processes multiple sensory modality inputs, such as proprioception, vision, auditory system, tactile, olfactory, vestibular system, interoception, and taste into usable functional outputs.
Somatic psychology or, more precisely, "somatic clinical psychotherapy" is a form of psychotherapy that focuses on somatic experience, including therapeutic and holistic approaches to the body. It seeks to explore and heal mental and physical injury and trauma through body awareness and movement. Wilhelm Reich was first to try to develop a clear psychodynamic approach that included the body.
The theory of constructed emotion is a theory in affective science proposed by Lisa Feldman Barrett to explain the experience and perception of emotion. The theory posits that instances of emotion are constructed predictively by the brain in the moment as needed. It draws from social construction, psychological construction, and neuroconstruction.
The Ganzfeld effect, or perceptual deprivation, is a phenomenon of perception caused by exposure to an unstructured, uniform stimulation field. The effect is the result of the brain amplifying neural noise in order to look for the missing visual signals. The noise is interpreted in the higher visual cortex, and gives rise to hallucinations.
Interoceptive exposure is a cognitive behavioral therapy technique used in the treatment of panic disorder. It refers to carrying out exercises that bring about the physical sensations of a panic attack, such as hyperventilation and high muscle tension, and in the process removing the patient's conditioned response that the physical sensations will cause an attack to happen.
A sense is a biological system used by an organism for sensation, the process of gathering information about the surroundings through the detection of stimuli. Although, in some cultures, five human senses were traditionally identified as such, many more are now recognized. Senses used by non-human organisms are even greater in variety and number. During sensation, sense organs collect various stimuli for transduction, meaning transformation into a form that can be understood by the brain. Sensation and perception are fundamental to nearly every aspect of an organism's cognition, behavior and thought.
Rosen Method Bodywork is a type of Complementary and alternative medicine. This bodywork, described as 'psychosomatic', claims to help integrate one's bodily and emotional/mental experience. In the tradition of sensory awareness methods, Rosen Method Bodywork focuses clients' attention onto internal sensations and emotions that arise as areas for the body are gently contacted with a 'listening' touch. This means that the practitioner's goal is not to manipulate or fix clients but rather to notice areas of tension and stillness. The practitioner uses words to help clients become aware of these held places in the body and encourages clients to describe what they are feeling.
Homeostatic feeling is a class of feelings that inform us about our physiological condition. In his earlier work Antonio Damasio used "primordial feeling" but he now prefers the term "homeostatic feeling" for the class.
Peter Suedfeld is a Hungarian-Canadian professor emeritus of psychology at the University of British Columbia.
Sensory processing disorder is a condition in which multisensory input is not adequately processed in order to provide appropriate responses to the demands of the environment. Sensory processing disorder is present in many people with dyspraxia, autism spectrum disorder and attention deficit hyperactivity disorder. Individuals with SPD may inadequately process visual, auditory, olfactory (smell), gustatory (taste), tactile (touch), vestibular (balance), proprioception, and interoception sensory stimuli.
In neuroscience, predictive coding is a theory of brain function which postulates that the brain is constantly generating and updating a "mental model" of the environment. According to the theory, such a mental model is used to predict input signals from the senses that are then compared with the actual input signals from those senses. Predictive coding is member of a wider set of theories that follow the Bayesian brain hypothesis.
Interoception is the collection of senses providing information to the organism about the internal state of the body. This can be both conscious and subconscious. It encompasses the brain's process of integrating signals relayed from the body into specific subregions—like the brainstem, thalamus, insula, somatosensory, and anterior cingulate cortex—allowing for a nuanced representation of the physiological state of the body. This is important for maintaining homeostatic conditions in the body and, potentially, facilitating self-awareness.
Occupational justice is a particular category of social justice related to the intrinsic need for humans to explore and act on their environments in ways that provide healthy levels of intellectual stimulation, and allow for personal care and safety, subsistence, pleasure, and social participation.\
Aaron James Traywick was an American businessman and life extension activist in the transhumanism and biohacking communities. He sought to develop gene therapies to make inexpensive treatments available for incurable conditions such as AIDS and the herpes simplex virus. His lack of any medical training and his unconventional methods—such as broadcasting an associate injecting himself with an "untested experimental gene therapy", then later doing the same to himself in an onstage public demonstration—drew widespread criticism.
