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Dreams are a succession of images, sounds or emotions that pass through the mind during sleep.[1] The content and purpose of dreams are not fully understood, though they have been a topic of speculation and interest throughout recorded history. The scientific study of dreams is known as oneirology.

The magical of dreamsEdit

Dreams can have plenty magical effects,. Ancient greek gods believed that dreams could be used to give someone an entire new life, not just in their heads. Reffering to dreams can give you magical power, or influence events in magical ways, and use to believe that dreams are portals to other worlds far from ours.

Dream Powers in cultureEdit

Lucid Dreaming - The ability to control your dreams

Luciopathy - The ability to control dreams, and the fraction they behold. (enhanced to lucid dreaming)

Precognative Dreaming : The ability to view the future in your dreams.

Dream Witchcraft: The ability to cast magic within your dreams.

Prophetic Dreaming: The ability to view prophecies in your dreams.

The cultural meaning of dreamingEdit

[1][2]Jacob's dream of a ladder of angelsThroughout history, people have sought meaning in dreams or divination through dreams.[2] Dreams have been described physiologically as a response to neural processes during sleep, psychologically as reflections of the subconscious, and spiritually as messages from gods, the deceased, predictions of the future or from the Soul. Many cultures practice dream incubation, with the intention of cultivating dreams that were prophetic or contained messages from the divine.

Judaism has a traditional ceremony called Hatavat Halom – literally meaning "making the dream a good one." Through this rite disturbing dreams can be transformed to give a positive interpretation by a rabbi or a rabbinic court.[3]

[edit] The Neurobiology of dreamingEdit

Main article: REM sleep[3][4]EEG showing brainwaves during REM sleepThere is not a universally agreed biological definition of dreaming. In 1952, Eugene Aserinsky identified and defined the rapid eye movement (REM) sleep while working in the surgery of his PhD advisor. Aserinsky noticed that the sleepers' eyes fluttered beneath their closed eyelids, later using a polygraph machine to record their brainwaves during these periods. In one session, he awakened a subject who was wailing and crying out during REM and confirmed his suspicion that dreaming was occurring.[4] In 1953, Aserinsky and his advisor published the ground-breaking study in Science.[5]

Accumulated observation has shown that dreams are strongly associated with Rapid Eye Movement during which an electroencephalogram (EEG) shows brain activity to be most like wakefulness. Participant-nonremembered dreams during NREM sleep are normally more mundane in comparison.[6] During a typical lifespan, a person spends a total of about six years dreaming[7] (which is about two hours each night).[8] Most dreams only last 5 to 20 minutes.[7] It is unknown where in the brain dreams originate, if there is a single origin for dreams or if multiple portions of the brain are involved, or what the purpose of dreaming is for the body or mind.

During REM sleep, the release of the neurotransmitters norepinephrine, serotonin and histamine is completely suppressed.[9][10][11] As a result, motor neurons are not stimulated, a condition known as REM atonia. This prevents dreams from resulting in dangerous movements of the body.

According to a report in the journal Neuron, rat brains show evidence of complex activity during sleep, including the activation in memory of long sequences of activity.[12][13] Studies show that various species of mammals and birds experience REM during sleep,[14] and follow the same series of sleeping states as humans.[12]

Despite their power to bewilder, arouse, frighten or amuse, dreams can often be ignored in mainstream models of cognitive psychology.[15] As methods of introspection were replaced with more self-consciously objective methods in the social sciences in 1930s and 1940s, dream studies dropped out of the scientific literature. Dreams were neither directly observable by an experimenter nor were subjects' dream reports reliable, being prey to the familiar problems of distortion due to delayed recall, if they were recalled at all. According to Sigmund Freud, dreams are more often forgotten entirely, perhaps due to their prohibited character. Altogether, these problems seemed to put them beyond the realm of science.

The discovery of dreams take place primarily during a distinctive electrophysiological state of sleep, rapid eye movement (REM) sleep, which can be identified by objective criteria, led to the rebirth of interest in this phenomenon. When REM sleep episodes were timed for their duration and subjects woken to make reports before major editing or forgetting could take place, it was determined that subjects accurately matched the length of time they judged the dream narrative to be ongoing to the length of REM sleep that preceded the awakening. There is no "time dilation" effect; a five-minute dream takes roughly five minutes of real time to play out.[16] This close correlation of REM sleep and dream experience was the basis of the first series of reports describing the nature of dreaming: that it is a regular nightly, rather than occasional, phenomenon, and a high-frequency activity within each sleep period occurring at predictable intervals of approximately every 60–90 minutes in all humans throughout the life span. REM sleep episodes and the dreams that accompany them lengthen progressively across the night, with the first episode being shortest, of approximately 10–12 minutes duration, and the second and third episodes increasing to 15–20 minutes. Dreams at the end of the night may last as long as 15 minutes, although these may be experienced as several distinct stories due to momentary arousals interrupting sleep as the night ends. Dream reports can be reported from normal subjects on 50% of the occasion when an awakening is made prior to the end of the first REM period. This rate of retrieval is increased to about 99% when awakenings are made from the last REM period of the night. This increase in the ability to recall appears to be related to intensification across the night in the vividness of dream imagery, colors and emotions.[citation needed]

[edit] Activation synthesis theoryEdit

Main article: Activation-synthesis hypothesisIn 1976 J. Allan Hobson and Robert McCarley proposed a new theory that changed dream research, challenging the previously held Freudian view of dreams as subconscious wishes to be interpreted. Activation synthesis theory asserts that the sensory experiences are fabricated by the cortex as a means of interpreting chaotic signals from the pons. They propose that during REM sleep, the ascending cholinergic PGO (ponto-geniculo-occipital) waves stimulate higher midbrain and forebrain cortical structures, producing rapid eye movements. The activated forebrain then synthesizes the dream out of this internally generated information. They assume that the same structures that induce REM sleep also generate sensory information.

Hobson's 1976 research suggested that the signals interpreted as dreams originated in the brain stem during REM sleep. However, research by Mark Solms suggests that dreams are generated in the forebrain, and that REM sleep and dreaming are not directly related.[17] While working in the neurosurgery department at hospitals in Johannesburg and London, Solms had access to patients with various brain injuries. He began to question patients about their dreams and confirmed that patients with damage to the parietal lobe stopped dreaming; this finding was in line with Hobson's 1977 theory. However, Solms did not encounter cases of loss of dreaming with patients having brain stem damage. This observation forced him to question Hobson's prevailing theory which marked the brain stem as the source of the signals interpreted as dreams. Solms viewed the idea of dreaming as a function of many complex brain structures as validating Freudian dream theory, an idea that drew criticism from Hobson. In 1978, Solms, along with partners William Kauffman and Edward Nadar, undertook a series of traumatic-injury impact studies using several different species of primates, particularly howler monkeys, in order to disprove Hobson's postulation that the brain stem played a significant role in dream pathology. Unfortunately, Solms' experiments proved inconclusive, as the high mortality rate associated with using a hydraulic impact pin to artificially induce brain damage in test subjects meant that his final candidate pool was too small to satisfy the requirements of the scientific method.[18]

[edit] Continual-activation theoryEdit

Combining Hobson's activation synthesis hypothesis with Solms' findings, the continual-activation theory of dreaming presented by Jie Zhang proposes that dreaming is a result of brain activation and synthesis; at the same time, dreaming and REM sleep are controlled by different brain mechanisms. Zhang hypothesizes that the function of sleep is to process, encode and transfer the data from the short-term memory to the long-term memory, though there is not much evidence backing up this so-called "consolidation." NREM sleep processes the conscious-related memory (declarative memory), and REM sleep processes the unconscious related memory (procedural memory).

Zhang assumes during REM sleep, the unconscious part of a brain is busy processing the procedural memory; meanwhile, the level of activation in the conscious part of the brain will descend to a very low level as the inputs from the sensory are basically disconnected. This will trigger the "continual-activation" mechanism to generate a data stream from the memory stores to flow through the conscious part of the brain. Zhang suggests that this pulse-like brain activation is the inducer of each dream. He proposes that, with the involvement of the brain associative thinking system, dreaming is, thereafter, self-maintained with the dreamer's own thinking until the next pulse of memory insertion. This explains why dreams have both characteristics of continuity (within a dream) and sudden changes (between two dreams).[19][20]

[edit] Dreams as excitations of long-term memoryEdit

Eugen Tarnow suggests that dreams are ever-present excitations of long-term memory, even during waking life. The strangeness of dreams is due to the format of long-term memory, reminiscent of Penfield & Rasmussen's findings that electrical excitations of the cortex give rise to experiences similar to dreams. During waking life an executive function interprets long-term memory consistent with reality checking. Tarnow's theory is a reworking of Freud's theory of dreams in which Freud's unconscious is replaced with the long-term memory system and Freud's "Dream Work" describes the structure of long-term memory.[21]

[edit] Dreams for strengthening of semantic memoriesEdit

[5][6]Location of hippocampusA 2001 study showed evidence that illogical locations, characters, and dream flow may help the brain strengthen the linking and consolidation of semantic memories. These conditions may occur because, during REM sleep, the flow of information between the hippocampus and neocortex is reduced.[22] Increasing levels of the stress hormone cortisol late in sleep (often during REM sleep) cause this decreased communication. One stage of memory consolidation is the linking of distant but related memories. Payne and Nadal hypothesize these memories are then consolidated into a smooth narrative, similar to a process that happens when memories are created under stress.[23]

[edit] Dreams for removing junkEdit

Robert (1886),[24] a physician from Hamburg, was the first who suggested that dreams are a need and that they have the function to erase (a) sensory impressions which were not fully worked up and (b) ideas which were not fully developed during the day. By the dream work incomplete material will be either removed or deepened and included into memory. Robert's ideas were cited repeatedly by Freud in his Traumdeutung. Hughlings Jackson (1911) viewed that sleep serves to sweep away unnecessary memories and connections from the day. This was revised in 1983 by Crick and Mitchison's "reverse learning" theory, which states that dreams are like the cleaning-up operations of computers when they are off-line, removing parasitic nodes and other "junk" from the mind during sleep.[25][26] However, the opposite view that dreaming has an information handling, memory-consolidating function (Hennevin and Leconte, 1971) is also common. Dreams are a result of the spontaneous firings of neural patterns while the brain is undergoing memory consolidation during sleep.

[edit] Dreams as resonance in neural circuitsEdit

During sleep the eyes are closed, so that the brain to some degree becomes isolated from the outside world. Moreover all signals from the senses (except olfaction) must pass through the thalamus before they reach the brain cortex, and during sleep thalamic activity is suppressed.[27] This means that the brain mainly works with signals from itself. A well-known phenomenon in dynamical physical systems where the level of input and output from the system is low is that oscillation makes spontaneous resonance patterns to occur. Hence, dreams may be the simple consequence of neural oscillation.

[edit] Psychology of sleep and dreamsEdit

[edit] Dreams for testing and selecting mental schemasEdit

Coutts[28] hypothesizes dreams modify and test mental schemas during sleep during a process he calls emotional selection, and that only schema modifications that appear emotionally adaptive during dream tests are selected for retention, while those that appear maladaptive are abandoned or further modified and tested. Alfred Adler suggested that dreams are often emotional preparations for solving problems, intoxicating an individual away from common sense toward private logic. The residual dream feelings may either reinforce or inhibit contemplated action.

[edit] Evolutionary psychology theories of dreamsEdit

Evolutionary psychologists believe dreams serve some adaptive function for survival. Deirdre Barrett describes dreaming as simply "thinking in different biochemical state" and believes people continue to work on all the same problems—personal and objective—in that state.[29] Her research finds that anything—math, musical composition, business dilemmas—may get solved during dreaming, but the two areas especially likely to help are 1) anything where vivid visualization contributes to the solution, whether in artistic design or invention of 3-D technological devices and 2) problem where the solution lies in "thinking outside the box"—i.e. the person is stuck because conventional wisdom on how to approach the problem is wrong.[30][31] In a related theory, which Mark Blechner terms "Oneiric Darwinism," dreams are seen as creating new ideas through the generation of random thought mutations. Some of these may be rejected by the mind as useless, while others may be seen as valuable and retained.[32] Finnish psychologist Antti Revonsuo posits that dreams have evolved for "threat simulation" exclusively.

[edit] Psychosomatic theoryEdit

Dreams are a product of "dissociated imagination," which is dissociated from the conscious self and draws material from sensory memory for simulation, with sensory feedback resulting in hallucination. By simulating the sensory signals to drive the autonomous nerves, dreams can affect mind-body interaction. In the brain and spine, the autonomous "repair nerves," which can expand the blood vessels, connect with compression and pain nerves. Repair nerves are grouped into many chains called meridians in Chinese medicine. When a repair nerve is prodded by compression or pain to send out its repair signal, a chain reaction spreads out to set other repair nerves in the same meridian into action. While dreaming, the body also employs the meridians to repair the body and help it grow and develop by simulating very intensive movement-compression signals to expand the blood vessels when the level of growth enzymes increase.[33]

[edit] Other hypotheses on dreamingEdit

There are many other hypotheses about the function of dreams, including:[34]

  • Dreams allow the repressed parts of the mind to be satisfied through fantasy while keeping the conscious mind from thoughts that would suddenly cause one to awaken from shock.[35]
  • Freud suggested that bad dreams let the brain learn to gain control over emotions resulting from distressing experiences.[34]
  • Jung suggested that dreams may compensate for one-sided attitudes held in waking consciousness.[36]
  • Ferenczi[37] proposed that the dream, when told, may communicate something that is not being said outright.
  • Dreams regulate mood.[38]
  • Hartmann[39] says dreams may function like psychotherapy, by "making connections in a safe place" and allowing the dreamer to integrate thoughts that may be dissociated during waking life.
  • More recent research by psychologist Joe Griffin, following a twelve-year review of data from all major sleep laboratories, led to the formulation of the expectation fulfilment theory of dreaming, which suggests that dreaming metaphorically completes patterns of emotional expectation in the autonomic nervous system and lowers stress levels in mammals.[40][41]

[edit] Dream contentEdit

From the 1940s to 1985, Calvin S. Hall collected more than 50,000 dream reports at Western Reserve University. In 1966 Hall and Van De Castle published The Content Analysis of Dreams in which they outlined a coding system to study 1,000 dream reports from college students.[42] It was found that people all over the world dream of mostly the same things. Hall's complete dream reports became publicly available in the mid-1990s by Hall's protégé William Domhoff, allowing further different analysis.

Personal experiences from the last day or week are frequently incorporated into dreams.[43]

[edit] EmotionsEdit

The most common emotion experienced in dreams is anxiety. Other emotions include pain, abandonment, fear, joy, happiness, etc. Negative emotions are much more common than positive ones.[42]

[edit] Sexual themesEdit

The Hall data analysis shows that sexual dreams occur no more than 10% of the time and are more prevalent in young to mid-teens.[42] Another study showed that 8% of men's and women's dreams have sexual content.[44] In some cases, sexual dreams may result in orgasms or nocturnal emissions. These are colloquially known as wet dreams.[45]

[edit] Recurring dreamsEdit

While the content of most dreams is dreamt only once, many people experience recurring dreams—that is, the same dream narrative is experienced over different occasions of sleep. Up to 70% of females and 65% of males report recurrent dreams.[citation needed]

[edit] Color vs. black and whiteEdit

A small minority of people say that they dream only in black and white.[46][47]

[edit] Dream interpretationsEdit

Main article: Dream interpretationDreams were historically used for healing (as in the asclepieions found in the ancient Greek temples of Asclepius) as well as for guidance or divine inspiration. Some Native American tribes used vision quests as a rite of passage, fasting and praying until an anticipated guiding dream was received, to be shared with the rest of the tribe upon their return.[48]

During the late 19th and early 20th centuries, both Sigmund Freud and Carl Jung identified dreams as an interaction between the unconscious and the conscious. They also assert together that the unconscious is the dominant force of the dream, and in dreams it conveys its own mental activity to the perceptive faculty. While Freud felt that there was an active censorship against the unconscious even during sleep, Jung argued that the dream's bizarre quality is an efficient language, comparable to poetry and uniquely capable of revealing the underlying meaning.

Fritz Perls presented his theory of dreams as part of the holistic nature of Gestalt therapy. Dreams are seen as projections of parts of the self that have been ignored, rejected, or suppressed.[49] Jung argued that one could consider every person in the dream to represent an aspect of the dreamer, which he called the subjective approach to dreams. Perls expanded this point of view to say that even inanimate objects in the dream may represent aspects of the dreamer. The dreamer may therefore be asked to imagine being an object in the dream and to describe it, in order to bring into awareness the characteristics of the object that correspond with the dreamer's personality.

[edit] Relationship with medical conditionsEdit

There is evidence that certain medical conditions (normally only neurological conditions) can impact dreams. For instance, some people with synesthesia have never reported entirely black-and-white dreaming, and often have a difficult time imagining the idea of dreaming in only black and white.[50]

Therapy for recurring nightmares (often associated with posttraumatic stress disorder) can include imagining alternative scenarios that could begin at each step of the dream.[51]

[edit] Dreams and psychosisEdit

A number of thinkers have commented on the similarities between the phenomenology of dreams and that of psychosis. Features common to the two states include thought disorder, flattened[clarification needed] or inappropriate affect (emotion), and hallucinations. Among philosophers, Immanuel Kant, for example, wrote that "the lunatic is a wakeful dreamer."[52] Arthur Schopenhauer said: "A dream is a short-lasting psychosis, and a psychosis is a long-lasting dream."[53] In the field of psychoanalysis, Sigmund Freud wrote: "A dream then, is a psychosis,"[54] and Carl Jung: "Let the dreamer walk about and act like one that is awake and we have the clinical picture of dementia praecox."[55]

McCreery[56][57] has sought to explain these similarities by reference to the fact, documented by Oswald,[58] that sleep can supervene as a reaction to extreme stress and hyper-arousal. McCreery adduces evidence that psychotics are people with a tendency to hyper-arousal, and suggests that this renders them prone to what Oswald calls "microsleeps" during waking life. He points in particular to the paradoxical finding of Stevens and Darbyshire[59] that patients suffering from catatonia can be roused from their seeming stupor by the administration of sedatives rather than stimulants.

Griffin and Tyrrell[60] go so far as to say that "schizophrenia is waking reality processed through the dreaming brain."[61]

[edit] Other associated phenomenaEdit

[edit] Lucid dreamingEdit

Main article: Lucid dreamingLucid dreaming is the conscious perception of one's state while dreaming. In this state a person usually has control over characters and the environment of the dream as well as the dreamer's own actions within the dream.[62] The occurrence of lucid dreaming has been scientifically verified.[63]

Oneironaut is a term sometimes used for those who lucidly dream.

[edit] Dreams of absent-minded transgressionEdit

Dreams of absent-minded transgression (DAMT) are dreams wherein the dreamer absentmindedly performs an action that he or she has been trying to stop (one classic example is of a quitting smoker having dreams of lighting a cigarette). Subjects who have had DAMT have reported waking with intense feelings of guilt. One study found a positive association between having these dreams and successfully stopping the behavior.[64]

[edit] Dreaming and the "real world"Edit

Main article: Dream argumentDuring the night there may be many external stimuli bombarding the senses, but the brain often interprets the stimulus and makes it a part of a dream in order to ensure continued sleep.[65] Dream incorporation is a phenomenon whereby an actual sensation, such as environmental sounds, are incorporated into dreams, such as hearing a phone ringing in a dream while it is ringing in reality or dreaming of urination while wetting the bed. The mind can, however, awaken an individual if they are in danger or if trained to respond to certain sounds, such as a baby crying. Except in the case of lucid dreaming, people dream without being aware that they are doing so. Some philosophers have concluded that what we think of as the "real world" could be or is an illusion (an idea known as the skeptical hypothesis about ontology). There is a famous painting by Salvador Dalí that depicts this concept, titled "Dream Caused by the Flight of a Bee around a Pomegranate a Second Before Awakening" (1944). The first recorded mention of the idea was by Zhuangzi, and is also discussed in Hinduism; Buddhism makes extensive use of the argument in its writings.[66] It was formally introduced to Western philosophy by Descartes in the 17th century in his Meditations on First Philosophy. Stimulus, usually an auditory one, becomes a part of a dream, eventually then awakening the dreamer. The term "dream incorporation" is also used in research examining the degree to which preceding daytime events become elements of dreams. Recent studies suggest that events in the day immediately preceding, and those about a week before, have the most influence.[43]

[edit] Recalling dreamsEdit

The recall of dreams is extremely unreliable, though it is a skill that can be trained. Dreams can usually be recalled if a person is awakened while dreaming.[51] Women tend to have more frequent dream recall than men.[51] Dreams that are difficult to recall may be characterized by relatively little affect, and factors such as salience, arousal, and interference play a role in dream recall. Often, a dream may be recalled upon viewing or hearing a random trigger or stimulus. A dream journal can be used to assist dream recall, for psychotherapy or entertainment purposes. For some people, vague images or sensations from the previous night's dreams are sometimes spontaneously experienced in falling asleep. However they are usually too slight and fleeting to allow dream recall. At least 95% of all dreams are not remembered. Certain brain chemicals necessary for converting short-term memories into long-term ones are suppressed during REM sleep. Unless a dream is particularly vivid and if one wakes during or immediately after it, the content of the dream will not be remembered.[67]

[edit] Déjà vuEdit

Main article: Déjà vuOne theory of déjà vu attributes the feeling of having previously seen or experienced something to having dreamt about a similar situation or place, and forgetting about it until one seems to be mysteriously reminded of the situation or the place while awake.[68]

[edit] Apparent precognitionEdit

Main article: PrecognitionAccording to surveys, it is common for peoples to feel that their dreams are predicting subsequent life events.[69] Psychologists have explained these experiences in terms of memory biases, namely a selective memory for accurate predictions and distorted memory so that dreams are retrospectively fitted onto life experiences.[69] The multi-faceted nature of dreams makes it easy to find connections between dream content and real events.[70]

In one experiment, subjects were asked to write down their dreams in a diary. This prevented the selective memory effect, and the dreams no longer seemed accurate about the future.[71] Another experiment gave subjects a fake diary of a student with apparently precognitive dreams. This diary described events from the person's life, as well as some predictive dreams and some non-predictive dreams. When subjects were asked to recall the dreams they had read, they remembered more of the successful predictions than unsuccessful ones.[72]

[edit] Popular cultureEdit

Modern popular culture often conceives of dreams, like Freud, as expressions of the dreamer's deepest fears and desires.[73] In films such as Spellbound (1945), The Manchurian Candidate (1962) and Inception (2010), the protagonists must extract vital clues from surreal dreams.[74]

Most dreams in popular culture are, however, not symbolic, but straightforward and realistic depictions of their dreamer's fears and desires.[74] Dream scenes may be indistinguishable from those set in the dreamer's real world, a narrative device that undermines the dreamer's and the audience's sense of security[74] and allows horror movie protagonists, such as those of Carrie (1976), Friday the 13th (1980) or An American Werewolf in London (1981) to be suddenly attacked by dark forces while resting in seemingly safe places.[74]

In speculative fiction, the line between dreams and reality may be blurred even more in the service of the story.[74] Dreams may be psychically invaded or manipulated (the Nightmare on Elm Street films, 1984–1991; Inception, 2010) or even come literally true (as in The Lathe of Heaven, 1971). Such stories play to audiences' experiences with their own dreams, which feel as real to them.[74]

[edit] See alsoEdit

*Cognitive Neuroscience of Dreams *Dream Yoga

[edit] ReferencesEdit

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[edit] Further readingEdit

  • Freud, Sigmund (1994). The interpretation of dreams. New York: Modern Library. ISBN 067960121X.
  • Jung, Carl (1934). The Practice of Psychotherapy. "The Practical Use of Dream-analysis". New York: Routledge & Kegan Paul. pp. 139-. ISBN 071001645X.
  • Jung, Carl (2002). Dreams (Routledge Classics). New York: Routledge. ISBN 0415267404.
  • Lombardo G.P., Foschi R. (2008), Escape from the dark forest: The experimentalist standpoint of the Sante De Sanctis dreaming psychology. History of the Human Sciences. vol. 21, pp. 45–69 ISSN: 0952-6951 begin_of_the_skype_highlighting 0952-6951 begin_of_the_skype_highlighting 0952-6951 end_of_the_skype_highlighting end_of_the_skype_highlighting.
  • Klemp, H. (1999). The art of spiritual dreaming. Minneapolis, MN: Eckankar.

[edit] External linksEdit

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