Laughter
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Laughter is a pleasant physical reaction and emotion consisting usually of rhythmical, often audible contractions of the diaphragm and other parts of the respiratory system. It is a response to certain external or internal
stimuli A stimulus is something that causes a physiological response. It may refer to: * Stimulation ** Stimulus (physiology), something external that influences an activity ** Stimulus (psychology), a concept in behaviorism and perception * Stimulus (eco ...
. Laughter can rise from such activities as being
tickled ''Tickled'' is a 2016 New Zealand documentary about "competitive endurance tickling" and videos featuring it, and the practices of those producing the videos, directed by David Farrier and Dylan Reeve. The film explores possible legal and ethica ...
, or from
humor Humour (English in the Commonwealth of Nations, Commonwealth English) or humor (American English) is the tendency of experiences to provoke laughter and provide amusement. The term derives from the humorism, humoral medicine of the ancient Gre ...
ous stories or thoughts. Most commonly, it is considered an auditory expression of a number of positive emotional states, such as joy, mirth,
happiness Happiness, in the context of Mental health, mental or emotional states, is positive or Pleasure, pleasant emotions ranging from contentment to intense joy. Other forms include life satisfaction, well-being, subjective well-being, flourishin ...
, or relief. On some occasions, however, it may be caused by contrary emotional states such as embarrassment, surprise, or confusion such as nervous laughter or courtesy laugh. Age, gender, education, language, and culture are all indicators as to whether a person will experience laughter in a given situation. Some other species of
primate Primates are a diverse order of mammals. They are divided into the strepsirrhines, which include the lemurs, galagos, and lorisids, and the haplorhines, which include the tarsiers and the simians (monkeys and apes, the latter including huma ...
(
chimpanzee The chimpanzee (''Pan troglodytes''), also known as simply the chimp, is a species of great ape native to the forest and savannah of tropical Africa. It has four confirmed subspecies and a fifth proposed subspecies. When its close relative th ...
s,
gorilla Gorillas are herbivorous, predominantly ground-dwelling great apes that inhabit the tropical forests of equatorial Africa. The genus ''Gorilla'' is divided into two species: the eastern gorilla and the western gorilla, and either four or fi ...
s and
orangutan Orangutans are great apes native to the rainforests of Indonesia and Malaysia. They are now found only in parts of Borneo and Sumatra, but during the Pleistocene they ranged throughout Southeast Asia and South China. Classified in the genu ...
s) show laughter-like vocalizations in response to physical contact such as wrestling, play chasing or tickling. Laughter is a part of
human behavior Human behavior is the potential and expressed capacity ( mentally, physically, and socially) of human individuals or groups to respond to internal and external stimuli throughout their life. Kagan, Jerome, Marc H. Bornstein, and Richard M. L ...
regulated by the
brain A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It is located in the head, usually close to the sensory organs for senses such as vision. It is the most complex organ in a v ...
, helping
human Humans (''Homo sapiens'') are the most abundant and widespread species of primate, characterized by bipedalism and exceptional cognitive skills due to a large and complex brain. This has enabled the development of advanced tools, culture, ...
s clarify their intentions in
social interaction A social relation or also described as a social interaction or social experience is the fundamental unit of analysis within the social sciences, and describes any voluntary or involuntary interpersonal relationship between two or more individuals ...
and providing an emotional context to conversations. Laughter is used as a signal for being part of a group—it signals acceptance and positive interactions with others. Laughter is sometimes seen as contagious, and the laughter of one person can itself provoke laughter from others as a
positive feedback Positive feedback (exacerbating feedback, self-reinforcing feedback) is a process that occurs in a feedback loop which exacerbates the effects of a small disturbance. That is, the effects of a perturbation on a system include an increase in the ...
. The study of humor and laughter, and its psychological and physiological effects on the human body, is called
gelotology Gelotology (from the Greek ''gelos'' "laughter") is the study of laughter and its effects on the body, from a psychological and physiological perspective. Its proponents often advocate induction of laughter on therapeutic grounds in alternati ...
.


Nature

Laughter might be thought of as an audible expression or appearance of excitement, an inward feeling of joy and happiness. It may ensue from
joke A joke is a display of humour in which words are used within a specific and well-defined narrative structure to make people laughter, laugh and is usually not meant to be interpreted literally. It usually takes the form of a story, often with ...
s,
tickling Tickling is the act of touching a part of a body in a way that causes involuntary twitching movements or laughter. The word evolved from the Middle English ''tikelen'', perhaps frequentative of ''ticken'', to touch lightly. In 1897, psycholo ...
, and other stimuli completely unrelated to psychological state, such as nitrous oxide. One group of researchers speculated that noises from infants as early as 16 days old may be vocal laughing sounds or laughter. However, the weight of the evidence supports the appearance of such sounds at 15 weeks to four months of age.
Laughter research This article lists publications in humor research, with brief annotations. The list includes books and scholarly journals that regularly cover articles in humor research. This list is not intended for humorous books and joke collections that do n ...
er said: "Laughter is a mechanism everyone has; laughter is part of universal human vocabulary. There are thousands of languages, hundreds of thousands of dialects, but everyone speaks laughter in pretty much the same way." Babies have the ability to laugh before they ever speak. Children who are born blind and deaf still retain the ability to laugh. Provine argues that "Laughter is primitive, an unconscious vocalization." Provine argues that it probably is genetic. In a study of the "Giggle Twins", two happy
twin Twins are two offspring produced by the same pregnancy.MedicineNet > Definition of TwinLast Editorial Review: 19 June 2000 Twins can be either ''monozygotic'' ('identical'), meaning that they develop from one zygote, which splits and forms two em ...
s who were separated at birth and only reunited 43 years later, Provine reports that "until they met each other, neither of these exceptionally happy ladies had known anyone who laughed as much as they did." They reported this even though they had been brought together by their adoptive parents, who they indicated were "undemonstrative and dour". He indicates that the twins "inherited some aspects of their laugh sound and pattern, readiness to laugh, and maybe even taste in humor". Scientists have noted the similarity in forms of laughter induced by tickling among various
primate Primates are a diverse order of mammals. They are divided into the strepsirrhines, which include the lemurs, galagos, and lorisids, and the haplorhines, which include the tarsiers and the simians (monkeys and apes, the latter including huma ...
s, which suggests that laughter derives from a common origin among primate species. The
spotted hyena The spotted hyena (''Crocuta crocuta''), also known as the laughing hyena, is a hyena species, currently classed as the sole extant member of the genus ''Crocuta'', native to sub-Saharan Africa. It is listed as being of least concern by the IUC ...
, another species of animal, was also known as the laughing hyena because of the way it sounds like when it communicates. A very rare neurological condition has been observed whereby the sufferer is unable to laugh out loud, a condition known as
aphonogelia Aphonogelia is a rare neuropsychological condition with which a person cannot laugh Laughter is a pleasant physical reaction and emotion consisting usually of rhythmical, often audible contractions of the diaphragm and other parts of the res ...
.


Brain

Neurophysiology Neurophysiology is a branch of physiology and neuroscience that studies nervous system function rather than nervous system architecture. This area aids in the diagnosis and monitoring of neurological diseases. Historically, it has been dominated b ...
indicates that laughter is linked with the activation of the
ventromedial prefrontal cortex The ventromedial prefrontal cortex (vmPFC) is a part of the prefrontal cortex in the mammalian brain. The ventral medial prefrontal is located in the frontal lobe at the bottom of the cerebral hemispheres and is implicated in the processing of r ...
, that produces
endorphin Endorphins (contracted from endogenous morphine) are chemical signals in the brain that block the perception of pain and increase feelings of wellbeing. They are produced and stored in an area of the brain known as the pituitary gland. Hist ...
s. Scientists have shown that parts of the
limbic system The limbic system, also known as the paleomammalian cortex, is a set of brain structures located on both sides of the thalamus, immediately beneath the medial temporal lobe of the cerebrum primarily in the forebrain.Schacter, Daniel L. 2012. ''Ps ...
are involved in laughter. This system is involved in emotions and helps us with functions necessary for humans' survival. The structures in the limbic system that are involved in laughter are the
hippocampus The hippocampus (via Latin from Greek , 'seahorse') is a major component of the brain of humans and other vertebrates. Humans and other mammals have two hippocampi, one in each side of the brain. The hippocampus is part of the limbic system, a ...
and the
amygdala The amygdala (; plural: amygdalae or amygdalas; also '; Latin from Greek, , ', 'almond', 'tonsil') is one of two almond-shaped clusters of nuclei located deep and medially within the temporal lobes of the brain's cerebrum in complex verteb ...
. The December 7, 1984, ''
Journal of the American Medical Association ''The Journal of the American Medical Association'' (''JAMA'') is a peer-reviewed medical journal published 48 times a year by the American Medical Association. It publishes original research, reviews, and editorials covering all aspects of bio ...
'' describes the neurological causes of laughter as follows: :"Although there is no known 'laugh center' in the brain, its neural mechanism has been the subject of much, albeit inconclusive, speculation. It is evident that its expression depends on neural paths arising in close association with the
telencephalic The cerebrum, telencephalon or endbrain is the largest part of the brain containing the cerebral cortex (of the two cerebral hemispheres), as well as several subcortical structures, including the hippocampus, basal ganglia, and olfactory bulb. In ...
and
diencephalic The diencephalon (or interbrain) is a division of the forebrain (embryonic ''prosencephalon''). It is situated between the telencephalon and the midbrain (embryonic ''mesencephalon''). The diencephalon has also been known as the 'tweenbrain in ol ...
centers concerned with
respiration Respiration may refer to: Biology * Cellular respiration, the process in which nutrients are converted into useful energy in a cell ** Anaerobic respiration, cellular respiration without oxygen ** Maintenance respiration, the amount of cellul ...
. Wilson considered the mechanism to be in the region of the mesial thalamus,
hypothalamus The hypothalamus () is a part of the brain that contains a number of small nuclei with a variety of functions. One of the most important functions is to link the nervous system to the endocrine system via the pituitary gland. The hypothalamu ...
, and
subthalamus The subthalamus or prethalamus is a part of the diencephalon. Its most prominent structure is the subthalamic nucleus. The subthalamus connects to the globus pallidus, a basal nucleus of the telencephalon. Structure The subthalamus is locate ...
. Kelly and co-workers, in turn, postulated that the
tegmentum The tegmentum (from Latin for "covering") is a general area within the brainstem. The tegmentum is the ventral part of the midbrain and the tectum is the dorsal part of the midbrain. It is located between the ventricular system and distinctive b ...
near the
periaqueductal grey The periaqueductal gray (PAG, also known as the central gray) is a brain region that plays a critical role in autonomic function, motivated behavior and behavioural responses to threatening stimuli. PAG is also the primary control center for d ...
contains the integrating mechanism for emotional expression. Thus, supranuclear pathways, including those from the limbic system that Papez hypothesised to mediate emotional expressions such as laughter, probably come into synaptic relation in the reticular core of the brain stem. So while purely emotional responses such as laughter are mediated by subcortical structures, especially the hypothalamus, and are stereotyped, the
cerebral cortex The cerebral cortex, also known as the cerebral mantle, is the outer layer of neural tissue of the cerebrum of the brain in humans and other mammals. The cerebral cortex mostly consists of the six-layered neocortex, with just 10% consisting of ...
can modulate or suppress them." Some drugs are well known for their laughter-facilitating properties (e. g.
ethanol Ethanol (abbr. EtOH; also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound. It is an Alcohol (chemistry), alcohol with the chemical formula . Its formula can be also written as or (an ethyl ...
and
cannabis ''Cannabis'' () is a genus of flowering plants in the family Cannabaceae. The number of species within the genus is disputed. Three species may be recognized: ''Cannabis sativa'', '' C. indica'', and '' C. ruderalis''. Alternatively ...
), while the others, like
salvinorin A Salvinorin A is the main active psychotropic molecule in ''Salvia divinorum''. Salvinorin A is considered a dissociative hallucinogen. It is structurally distinct from other naturally occurring hallucinogens (such as DMT, psilocybin, an ...
(the active ingredient of '' Salvia divinorum''), can even induce bursts of uncontrollable laughter. A research article was published December 1, 2000, on the psycho-evolution of laughter (Panksepp 2000).


Health

A link between laughter and healthy function of blood vessels was first reported in 2005 by researchers at the University of Maryland Medical Center with the fact that laughter causes the dilatation of the inner lining of blood vessels, the
endothelium The endothelium is a single layer of squamous endothelial cells that line the interior surface of blood vessels and lymphatic vessels. The endothelium forms an interface between circulating blood or lymph in the lumen and the rest of the vessel ...
, and increases blood flow. Drs. Michael Miller (University of Maryland) and William Fry (Stanford) theorize that beta-endorphin-like compounds released by the hypothalamus activate receptors on the endothelial surface to release
nitric oxide Nitric oxide (nitrogen oxide or nitrogen monoxide) is a colorless gas with the formula . It is one of the principal oxides of nitrogen. Nitric oxide is a free radical: it has an unpaired electron, which is sometimes denoted by a dot in its che ...
, thereby resulting in dilation of vessels. Other cardioprotective properties of nitric oxide include reduction of inflammation and decreased platelet aggregation. Laughter has various proven beneficial biochemical effects. It has been shown to lead to reductions in stress hormones such as
cortisol Cortisol is a steroid hormone, in the glucocorticoid class of hormones. When used as a medication, it is known as hydrocortisone. It is produced in many animals, mainly by the ''zona fasciculata'' of the adrenal cortex in the adrenal gland ...
and
epinephrine Adrenaline, also known as epinephrine, is a hormone and medication which is involved in regulating visceral functions (e.g., respiration). It appears as a white microcrystalline granule. Adrenaline is normally produced by the adrenal glands and ...
. When laughing, the brain releases endorphins that can relieve some physical pain. Laughter also boosts the number of antibody-producing cells and enhances the effectiveness of T-cells, leading to a stronger immune system. A 2000 study found that people with heart disease were 40 percent less likely to laugh and be able to recognize humor in a variety of situations, compared to people of the same age without heart disease. Anecdotally, journalist and author
Norman Cousins Norman Cousins (June 24, 1915 – November 30, 1990) was an American political journalist, author, professor, and world peace advocate. Early life Cousins was born to Jewish immigrant parents Samuel Cousins and Sarah Babushkin Cousins, in West ...
developed in 1964 a treatment program for his
ankylosing spondylitis Ankylosing spondylitis (AS) is a type of arthritis characterized by long-term inflammation of the joints of the spine typically where the spine joins the pelvis. Occasionally areas affected may include other joints such as the shoulders or hip ...
and
collagen disease Collagen disease is a term previously used to describe systemic autoimmune diseases (e.g., rheumatoid arthritis, systemic lupus erythematosus, and systemic sclerosis), but now is thought to be more appropriate for diseases associated with defects ...
consisting of large doses of Vitamin C alongside laughter induced by comic films, including those of the
Marx Brothers The Marx Brothers were an American family comedy act that was successful in vaudeville, on Broadway, and in motion pictures from 1905 to 1949. Five of the Marx Brothers' thirteen feature films were selected by the American Film Institute (AFI) ...
. "I made the joyous discovery that ten minutes of genuine belly laughter had an anesthetic effect and would give me at least two hours of pain-free sleep," he reported. "When the pain-killing effect of the laughter wore off, we would switch on the motion picture projector again and not infrequently, it would lead to another pain-free interval."


Communication

A number of studies using methods of
conversation analysis Conversation analysis (CA) is an approach to the study of social interaction, embracing both verbal and non-verbal conduct, in situations of everyday life. CA originated as a sociological method, but has since spread to other fields. CA began with ...
and
discourse analysis Discourse analysis (DA), or discourse studies, is an approach to the analysis of written, vocal, or sign language use, or any significant semiotic event. The objects of discourse Analysis (discourse, writing, conversation, communicative event) ...
have documented the systematic workings of laughter in a variety of interactions, from casual conversations to interviews, meetings, and therapy sessions. Working with recorded interactions, researchers have created detailed transcripts that indicate not only the presence of laughter but also features of its production and placement. These studies challenge several widely held assumptions about the nature of laughter. Contrary to notions that it is spontaneous and involuntary, research documents that laughter is sequentially organized and precisely placed relative to surrounding talk. Far more than merely a response to humor, laughter often works to manage delicate and serious moments. More than simply an external behavior "caused" by an inner state, laughter is highly communicative and helps accomplish actions and regulate relationships.


Causes

Common causes for laughter are sensations of
joy The word joy refers to the emotion evoked by well-being, success, or good fortune, and is typically associated with feelings of intense, long lasting happiness. Dictionary definitions Dictionary definitions of joy typically include a sense of ...
and
humor Humour (English in the Commonwealth of Nations, Commonwealth English) or humor (American English) is the tendency of experiences to provoke laughter and provide amusement. The term derives from the humorism, humoral medicine of the ancient Gre ...
; however, other situations may cause laughter as well. A general theory that explains laughter is called the relief theory.
Sigmund Freud Sigmund Freud ( , ; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the founder of psychoanalysis, a clinical method for evaluating and treating psychopathology, pathologies explained as originatin ...
summarized it in his theory that laughter releases tension and "psychic energy". This theory is one of the justifications of the beliefs that laughter is beneficial for one's health.M.P. Mulder, A. Nijholt (2002
"Humor Research: State of the Art"
citeseer.ist.psu.edu
This theory explains why laughter can be used as a coping mechanism when one is upset, angry or sad.
Philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
John Morreall theorizes that human laughter may have its biological origins as a kind of shared expression of relief at the passing of danger.
Friedrich Nietzsche Friedrich Wilhelm Nietzsche (; or ; 15 October 1844 – 25 August 1900) was a German philosopher, prose poet, cultural critic, philologist, and composer whose work has exerted a profound influence on contemporary philosophy. He began his ...
, by contrast, suggested laughter to be a reaction to the sense of
existential Existentialism ( ) is a form of philosophical inquiry that explores the problem of human existence and centers on human thinking, feeling, and acting. Existentialist thinkers frequently explore issues related to the meaning, purpose, and valu ...
loneliness and mortality that only humans feel. For example: a
joke A joke is a display of humour in which words are used within a specific and well-defined narrative structure to make people laughter, laugh and is usually not meant to be interpreted literally. It usually takes the form of a story, often with ...
creates an inconsistency and the audience automatically tries to understand what the inconsistency means; if they are successful in solving this 'cognitive
riddle A riddle is a statement, question or phrase having a double or veiled meaning, put forth as a puzzle to be solved. Riddles are of two types: ''enigmas'', which are problems generally expressed in metaphorical or allegorical language that requ ...
' and they realize that the surprise was not dangerous, they laugh with relief. Otherwise, if the inconsistency is not resolved, there is no laugh, as
Mack Sennett Mack Sennett (born Michael Sinnott; January 17, 1880 – November 5, 1960) was a Canadian-American film actor, director, and producer, and studio head, known as the 'King of Comedy'. Born in Danville, Quebec, in 1880, he started in films in the ...
pointed out: "when the audience is confused, it doesn't laugh." This is one of the basic laws of a comedian, referred to as "exactness". It is important to note that sometimes the inconsistency may be resolved and there may still be no laugh. Because laughter is a social mechanism, an audience may not feel as if they are in danger, and the laugh may not occur. In addition, the extent of the inconsistency (and aspects of its timing and rhythm) has to do with the amount of danger the audience feels, and how hard or long they laugh. Laughter can also be brought on by
tickling Tickling is the act of touching a part of a body in a way that causes involuntary twitching movements or laughter. The word evolved from the Middle English ''tikelen'', perhaps frequentative of ''ticken'', to touch lightly. In 1897, psycholo ...
. Although most people find it unpleasant, being tickled often causes heavy laughter, thought to be an (often uncontrollable) reflex of the body.


Structure and anatomy

A normal laugh has the structure of "ha-ha-ha" or "ho-ho-ho". It is unnatural, and one is physically unable, to have a laugh structure of "ha-ho-ha-ho". The usual variations of a laugh most often occur in the first or final note in a sequence- therefore, "ho-ha-ha" or "ha-ha-ho" laughs are possible. Normal note durations with unusually long or short "inter-note intervals" do not happen due to the result of the limitations of our vocal cords. This basic structure allows one to recognize a laugh despite individual variants. It has also been determined that eyes moisten during laughter as a reflex from the tear glands.Smith Lee, B. (1990). Humor relations for nurse managers. Nursing Management, 21, 86.


Negative aspects

Laughter is not always a pleasant experience and is associated with several negative phenomena. Excessive laughter can lead to
cataplexy Cataplexy is a sudden and transient episode of muscle weakness accompanied by full conscious awareness, typically triggered by emotions such as laughing, crying, or terror. Cataplexy affects approximately 70% of people who have narcolepsy, and is ...
, and unpleasant laughter spells, excessive elation, and fits of laughter can all be considered negative aspects of laughter. Unpleasant laughter spells, or "sham mirth," usually occur in people who have a neurological condition, including patients with
pseudobulbar palsy Pseudobulbar palsy is a medical condition characterized by the inability to control facial movements (such as chewing and speaking) and caused by a variety of neurological disorders. Patients experience difficulty chewing and swallowing, have in ...
,
multiple sclerosis Multiple (cerebral) sclerosis (MS), also known as encephalomyelitis disseminata or disseminated sclerosis, is the most common demyelinating disease, in which the insulating covers of nerve cells in the brain and spinal cord are damaged. This d ...
and
Parkinson's disease Parkinson's disease (PD), or simply Parkinson's, is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. The symptoms usually emerge slowly, and as the disease worsens, non-motor symptoms becom ...
. These patients appear to be laughing out of amusement but report that they are feeling undesirable sensations "at the time of the punch line". Excessive elation is a common symptom associated with
bipolar disorder Bipolar disorder, previously known as manic depression, is a mental disorder characterized by periods of depression and periods of abnormally elevated mood that last from days to weeks each. If the elevated mood is severe or associated with ...
psychoses and
mania Mania, also known as manic syndrome, is a mental and behavioral disorder defined as a state of abnormally elevated arousal, affect, and energy level, or "a state of heightened overall activation with enhanced affective expression together wit ...
/
hypomania Hypomania (literally "under mania" or "less than mania") is a mental and behavioural disorder, characterised essentially by an apparently non-contextual elevation of mood ( euphoria) that contributes to persistently disinhibited behaviour. Th ...
. Those with schizophrenic psychoses seem to experience the opposite—they do not understand humor or get any joy out of it. A fit describes an abnormal time when one cannot control the laughter or one's body, sometimes leading to seizures or a brief period of unconsciousness. Some believe that fits of laughter represent a form of
epilepsy Epilepsy is a group of non-communicable neurological disorders characterized by recurrent epileptic seizures. Epileptic seizures can vary from brief and nearly undetectable periods to long periods of vigorous shaking due to abnormal electrical ...
.


Therapy

Laughter has been used as a
therapeutic A therapy or medical treatment (often abbreviated tx, Tx, or Tx) is the attempted remediation of a health problem, usually following a medical diagnosis. As a rule, each therapy has indications and contraindications. There are many different ...
tool for many years because it is a natural form of medicine. Laughter is available to everyone and it provides benefits to a person's physical, emotional, and social well being. Some of the benefits of using laughter therapy are that it can relieve stress and relax the whole body. It can also boost the immune system and release endorphins to relieve pain. Additionally, laughter can help prevent
heart disease Cardiovascular disease (CVD) is a class of diseases that involve the heart or blood vessels. CVD includes coronary artery diseases (CAD) such as angina and myocardial infarction (commonly known as a heart attack). Other CVDs include stroke, hea ...
by increasing blood flow and improving the function of blood vessels. Some of the emotional benefits include diminishing
anxiety Anxiety is an emotion which is characterized by an unpleasant state of inner turmoil and includes feelings of dread over anticipated events. Anxiety is different than fear in that the former is defined as the anticipation of a future threat wh ...
or fear, improving overall mood, and adding joy to one's life. Laughter is also known to reduce allergic reactions in a preliminary study related to
dust mite allergy Dust mite allergy, also known as house dust allergy, is a sensitization and allergic reaction to the droppings of house dust mites. The allergy is common and can trigger allergic reactions such as asthma, eczema or itching. It is the manifestat ...
sufferers. Laughter therapy also has some social benefits, such as strengthening relationships, improving teamwork and reducing conflicts, and making oneself more attractive to others. Therefore, whether a person is trying to cope with a terminal illness or just trying to manage their stress or anxiety levels, laughter therapy can be a significant enhancement to their life. Ramon Mora-Ripoll in his study on ''The Therapeutic Value Of Laughter In Medicine,'' stated that laughter therapy is an inexpensive and simple tool that can be used in patient care. It is a tool that is only beneficial when experienced and shared. Care givers need to recognize the importance of laughter and possess the right attitude to pass it on. He went on to say that since this type of therapy is not widely practiced, health care providers will have to learn how to effectively use it. In another survey, researchers looked at how Occupational Therapists and other care givers viewed and used humor with patients as a means of therapy. Many agreed that while they believed it was beneficial to the patients, the proper training was lacking in order to effectively use It. Even though laughter and humor has been used therapeutically in medical conditions, according to Mora-Ripoll, there was not enough data to clearly establish that laughter could be used as an overall means of healing. It did suggest that additional research was still needed since "well-designed randomized controlled trials have not been conducted to date validating the therapeutic efficacy of laughter." In 2017, an institution in Japan conducted an open-label randomized controlled trial to evaluate the effects of laughter therapy on quality of life in patients with cancer. The study used laughter yoga, comedy, clown and jokes. The result showed that laughter therapy was helpful in improving quality of life and cancer symptoms in some areas for cancer survivors. Improvements were seen in the area of depression, anxiety and stress levels. There were limited harmful side effects. Laughter therapy should be used in conjunction with other cancer treatment.


Research and philosophy

Laughter in literature, although considered understudied by some, is a subject that has received attention in the written word for millennia. The use of
humor Humour (English in the Commonwealth of Nations, Commonwealth English) or humor (American English) is the tendency of experiences to provoke laughter and provide amusement. The term derives from the humorism, humoral medicine of the ancient Gre ...
and laughter in literary works has been studied and analyzed by many thinkers and writers, from the
Ancient Greek philosophers Ancient Greek philosophy arose in the 6th century BC, marking the end of the Greek Dark Ages. Greek philosophy continued throughout the Hellenistic period and the period in which Greece and most Greek-inhabited lands were part of the Roman Empire ...
onward. Henri Bergson's ''Laughter: An Essay on the Meaning of the Comic'' (''Le rire'', 1901) is a notable 20th-century contribution.


Ancient


Herodotus

For
Herodotus Herodotus ( ; grc, , }; BC) was an ancient Greek historian and geographer from the Greek city of Halicarnassus, part of the Persian Empire (now Bodrum, Turkey) and a later citizen of Thurii in modern Calabria ( Italy). He is known f ...
, laughers can be distinguished into three types: Lateiner, Donald
''No laughing matter: a literary tactic in Herodotus''
Transactions of the American Philological Association, Vol. 107. (1977), pp. 173-182.
*Those who are innocent of wrongdoing, but ignorant of their own vulnerability *Those who are mad *Those who are overconfident According to
Donald Lateiner Donald is a masculine given name derived from the Goidelic languages, Gaelic name ''Dòmhnall''.. This comes from the Proto-Celtic language, Proto-Celtic *''Dumno-ualos'' ("world-ruler" or "world-wielder"). The final -''d'' in ''Donald'' is part ...
, Herodotus reports about laughter for valid literary and historiological reasons. "Herodotus believes either that both nature (better, the gods' direction of it) and human nature coincide sufficiently, ''or'' that the latter is but an aspect or analogue of the former, so that to the recipient the outcome is suggested." When reporting laughter, Herodotus does so in the conviction that it tells the reader something about the future and/or the character of the person laughing. It is also in this sense that it is not coincidental that in about 80% of the times when Herodotus speaks about laughter it is followed by a retribution. "Men whose laughter deserves report are marked, because laughter connotes scornful disdain, disdain feeling of superiority, and this feeling and the actions which stem from it attract the wrath of the gods."


Modern

There is a wide range of experiences with laughter. A 1999 study by two humor researchers asked 80 people to keep a daily laughter record, and found they laughed an average of 18 times per day. However, their study also found a wide range, with some people laughing as many as 89 times per day, and others laughing as few as 0 times per day.


Hobbes

Thomas Hobbes Thomas Hobbes ( ; 5/15 April 1588 – 4/14 December 1679) was an English philosopher, considered to be one of the founders of modern political philosophy. Hobbes is best known for his 1651 book ''Leviathan'', in which he expounds an influent ...
wrote, "The passion of laughter is nothing else but sudden glory arising from sudden conception of some eminency in ourselves, by comparison with the infirmity of others, or with our own formerly."


Schopenhauer

Philosopher
Arthur Schopenhauer Arthur Schopenhauer ( , ; 22 February 1788 – 21 September 1860) was a German philosopher. He is best known for his 1818 work ''The World as Will and Representation'' (expanded in 1844), which characterizes the phenomenal world as the prod ...
devotes the 13th chapter of the first part of his major work, ''
The World as Will and Representation ''The World as Will and Representation'' (''WWR''; german: Die Welt als Wille und Vorstellung, ''WWV''), sometimes translated as ''The World as Will and Idea'', is the central work of the German philosopher Arthur Schopenhauer. The first edition ...
'', to laughter.


Nietzsche

Friedrich Nietzsche Friedrich Wilhelm Nietzsche (; or ; 15 October 1844 – 25 August 1900) was a German philosopher, prose poet, cultural critic, philologist, and composer whose work has exerted a profound influence on contemporary philosophy. He began his ...
distinguishes two different purposes for the use of laughter. In a positive sense, "man uses the comical as a therapy against the restraining jacket of logic, morality and reason. He needs from time to time a harmless demotion from reason and hardship and in this sense laughter has a positive character for Nietzsche." Laughter can, however, also have a negative connotation when it is used for the expression of social conflict. This is expressed, for instance, in ''
The Gay Science ''The Gay Science'' (german: Die fröhliche Wissenschaft), sometimes translated as ''The Joyful Wisdom'' or ''The Joyous Science'', is a book by Friedrich Nietzsche published in 1882, and followed by a second edition in 1887 after the completio ...
'' : "Laughter -- Laughter means to be
schadenfroh Schadenfreude (; ; 'harm-joy') is the experience of pleasure, joy, or self-satisfaction that comes from learning of or witnessing the troubles, failures, or humiliation of another. It is a borrowed word from German, with no direct translation ...
, but with clear conscience." "Possibly Nietzsche's works would have had a totally different effect, if the playful, ironical and joking in his writings would have been factored in better"


Bergson

In '' Laughter: An Essay on the Meaning of the Comic'', French philosopher
Henri Bergson Henri-Louis Bergson (; 18 October 1859 – 4 January 1941) was a French philosopherHenri Bergson. 2014. Encyclopædia Britannica Online. Retrieved 13 August 2014, from https://www.britannica.com/EBchecked/topic/61856/Henri-Bergson
, renowned for his philosophical studies on materiality, memory, life and
consciousness Consciousness, at its simplest, is sentience and awareness of internal and external existence. However, the lack of definitions has led to millennia of analyses, explanations and debates by philosophers, theologians, linguisticians, and scien ...
, tries to determine the laws of the comic and to understand the fundamental causes of comic situations. His method consists in determining the causes of the comic instead of analyzing its effects. He also deals with laughter in relation to human life, collective imagination and
art Art is a diverse range of human activity, and resulting product, that involves creative or imaginative talent expressive of technical proficiency, beauty, emotional power, or conceptual ideas. There is no generally agreed definition of wha ...
, to have a better knowledge of society. One of the theories of the essay is that laughter, as a collective activity, has a social and moral role, in forcing people to eliminate their vices. It is a factor of uniformity of behaviours, as it condemns ludicrous and eccentric behaviours.


Ludovici

Anthony Ludovici Anthony Mario Ludovici MBE (8 January 1882 – 3 April 1971) was a British philosopher, sociologist, social critic and polyglot. He is known as a proponent of aristocracy and anti-egalitarianism, and in the early 20th century was a lea ...
developed the thoughts of Hobbes even further in '' The Secret of Laughter''. His conviction is that there's something sinister in laughter, and that the modern omnipresence of humour and the idolatry of it are signs of societal weakness, as instinctive resort to humour became a sort of escapism from responsibility and action. Ludovici considered laughter to be an evolutionary trait and he offered many examples of different triggers for laughter with their own distinct explanations.


Bellieni

Carlo Bellieni examined laughterin an essay published in New Ideas in Psychology. He wrote we can strip back laughter to a three-step process. First, it needs a situation that seems odd and induces a sense of incongruity (bewilderment or panic). Second, the worry or stress the incongruous situation has provoked must be worked out and overcome (resolution). Third, the actual release of laughter acts as an all-clear siren to alert bystanders (relief) that they are safe.


See also

*
Death from laughter Death from laughter is a supposedly extremely rare form of death, usually resulting from either cardiac arrest or asphyxiation, that has itself been caused by a fit of laughter. Instances of death by laughter have been recorded from the times ...
*
Evil laughter Evil laughter or maniacal laughter is manic laughter by a villain in fiction. The expression dates to at least 1860. "Wicked laugh" can be found even earlier, dating back to at least 1784. Another variant, the "sardonic laugh," shows up in 171 ...
*
Laughter yoga Laughter yoga (''Hasyayoga'') is a modern exercise involving prolonged voluntary laughter. This type of yoga is based on the belief that voluntary laughter provides similar physiological and psychological benefits as spontaneous laughter. It is ...
* Paradoxical laughter *
Pathological laughing and crying Pseudobulbar affect (PBA), or emotional incontinence, is a type of affect (psychology), emotional disturbance characterized by uncontrollable episodes of crying, laughter, laughing, anger or other emotional displays. PBA occurs secondary to a ne ...
*
Smile A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses ...


References


Further reading

* Bachorowski, J.-A., Smoski, M.J., & Owren, M.J. ''The acoustic features of human laughter.'' Journal of the Acoustical Society of America, 110 (1581) 2001 * * Chapman, Antony J.; Foot, Hugh C.; Derks, Peter (editors)
''Humor and Laughter: Theory, Research, and Applications''
Transaction Publishers, 1996. . Books.google.com * Cousins, Norman, ''Anatomy of an Illness As Perceived by the Patient'', 1979. * * Fried, I., Wilson, C.L., MacDonald, K.A., and Behnke EJ. ''Electric current stimulates laughter.'' Nature, 391:650, 1998 (see
patient AK In neuroanatomy, the superior frontal gyrus (SFG, also marginal gyrus) is a gyrus – a ridge on the brain's cerebral cortex – which makes up about one third of the frontal lobe. It is bounded laterally by the superior frontal sulcus. The su ...
) * Goel, V. & Dolan, R. J. ''The functional anatomy of humor: segregating cognitive and affective components.'' Nature Neuroscience 3, 237 - 238 (2001). * Greig, John Young Thomson, ''The Psychology of Comedy and Laughter'', New York, Dodd, Mead and company, 1923. * * Knight, Chris
Does laughter hold the key to human consciousness? – Chris Knight , Aeon Essays "Does laughter hold the key to human consciousness?"
''Aeon Magazine'' February 2019. * Marteinson, Peter,

'', Legas Press, Ottawa, 2006. utoronto.ca * * Provine, R. R.

''American Scientist'', V84, 38:45, 1996. ucla.edu * * included in book: * Raskin, Victor, ''Semantic Mechanisms of Humor'' (1985). * MacDonald, C.
"A Chuckle a Day Keeps the Doctor Away: Therapeutic Humor & Laughter"
''Journal of Psychosocial Nursing and Mental Health Services'' (2004) V42, 3:18-25. psychnurse.org * Kawakami, K., et al.
"Origins of smile and laughter: A preliminary study"
''Early Human Development'' (2006) 82, 61–66. kyoto-u.ac.jp * Johnson, S.
''Emotions and the Brain''
Discover (2003) V24, N4. discover.com * Panksepp, J., Burgdorf, J
"'Laughing' rats and the evolutionary antecedents of human joy?"
''Physiology & Behavior'' (2003) 79:533-547. psych.umn.edu * Milius, S.
"Don't look now, but is that dog laughing?"
''Science News'' (2001) V160 4:55. sciencenews.org * Simonet, P., et al.
''Dog Laughter: Recorded playback reduces stress related behavior in shelter dogs''
7th International Conference on Environmental Enrichment (2005). petalk.org * Discover Health (2004

helpguide.org * Klein, A. ''The Courage to Laugh: Humor, Hope and Healing in the Face of Death and Dying.'' Los Angeles, CA: Tarcher/Putman, 1998. *Ron Jenkins ''Subversive laughter'' (New York, Free Press, 1994), 13ff *Bogard, M. ''Laughter and its Effects on Groups''. New York, New York: Bullish Press, 2008. *Humor Theory. The formulae of laughter by Igor Krichtafovitch, Outskitspress, 2006, * Hans-Georg Moeller und Günter Wohlfart (Hrsg.): ''Laughter in Eastern and Western Philosophies''. Verlag Karl Alber, Freiburg / München 2010.


External links


Did laughter make the mind?
Aeon magazine

, chass.utoronto.ca
Human laughter up to 16 million years old
cosmosmagazine.com

faculty.Washington.edu * WNYC's Radio Lab radio show
Is Laughter just a Human Thing?
wnyc.org
Transcriptions of laughter
writtensound.com
Recordings of people laughing
99 audio examples of human laughter
Comprehensive summary of research on the benefits of laughter
{{Nonverbal communication Happiness