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Humor research is a multidisciplinary field which enters the domains of psychology, philosophy, linguistics, sociology, history and literature. More recently, computational humor, a subdomain of the computer science and artificial intelligence emerged, which uses computers to model humor. Research in humor has been done to understand the psychological and physiological effects, both positive and negative, on a person or groups of people. Research in humor has revealed many different theories of humor and many different kinds of humor including their functions and effects personally, in relationships, and in society.

Areas of Humour Research
Humor research deals with a wide variety of issues, which can be categorized according to several theories of humor. Because of its interdisciplinary nature, humour research has many areas of study which aim to explain the phenomenon of humour.

Neuroanatomy of Humour
Cognitive neuroscience has provided insight into how humor is neurologically realized. Brain imaging techniques such as fMRI and PET scans have been implemented in this subfield of humor research. There are a few main regions of the human brain associated with humour and laughter. The production of laughter involves two primary brain pathways, one for both involuntary and voluntary laughter (cf. Duchenne and non-Duchenne). Involuntary laughter is usually emotionally driven, and includes key emotional brain areas such as the amygdala, thalamic areas, and the brainstem. Voluntary laughter instead begins in the premotor opercular area (in the temporal lobe) and moves to the motor cortex and pyramidal tract before moving to the brainstem. Wild et al. (2003) propose that the generation of laughter is mostly influenced by neural pathways that go from the premotor and motor cortex to the ventral side of the brainstem, through the cerebral peduncles. It is also suggested that real laughter is not produced from the motor cortex, but that the normal inhibition of cortical frontal areas stops during laughter. When the electrical activity of the brain is measured during and after hearing a joke, a prominent response can be seen approximately 300ms after the punchline, followed by a depolarization about 100ms later. The fact that humour response occurs in two separate waves of activity supports the idea that humour processing occurs in two stages. Functional MRI and PET studies further illuminate which parts of the brain are participating in the experience of humour. A study by Ozawa, et al., (2000) found that hearing sentences which participants rated as humourous resulted in activation in Broca’s area and the middle frontal gyrus, in addition to Wernicke’s area and the transverse temporal gyri, which were activated in control (non-humourous) conditions as well. Another study using fMRI showed that the parts of the brain responding to puns and semantic-based jokes which participants found amusing were different. In response to puns, the left posterior middle temporal gyrus and the left inferior frontal gyrus were activated. When listening to semantic jokes, the left posterior middle temporal gyrus was again activated, and so were the left posterior inferior temporal gyrus, the right posterior middle temporal gyrus, and the cerebellum. Interestingly, brain activity in the medial ventral prefrontal cortex was associated with ratings of funniness which the participants gave after the brain scan and initial humour response. This response may be stemming from the mood or emotional change which occurs after hearing humour. Induction of laughter through direct brain stimulation has been reported in a number of studies, and include areas such as ACC, globus pallidus, floor of the third ventricle, and most recently left superior frontal gyrus – though these are hard to draw inferences from (maybe inhibitory, maybe artefacts, etc.) Because the complex nature of laughter (facial muscles, respiratory actions, etc.) a control center has been hypothesized in the upper pons.

Positive psychology and play research
Studies within play research have provided correlates to the study of humor, as play often takes on a humorous demeanor. A child's social play often invokes the use of jokes, non-serious social incongruity, physical slapstick humor. Studies on how play "promot[es] social cohesion, cooperation, and even altruism," have been used to describe humor's function. Laughter is often a byproduct of playful social interactions, and can therefore be viewed as serving a similar function as play. It can be said that the perception and appreciation of humor decreases aggression and stress while promoting cooperation and fairness. Play research can provide a functional look at humor in its relation to social interactions.

Evolutionary psychology
Evolutionary theorists have attempted to study and explain the phenomena of laughter and humour in terms of survival benefit. Laughter-like behavior is not unique to humans, but humans do display a much more consistent and complex use of humour and laughter than other animals The evolution and functions of laughter and humour have been explored in an attempt to understand how and why humour and laughter have become part of human existence.

Duchenne laughter refers to laughter that is stimulus-driven and linked to some positive experience. This is usually the result of a perceived social incongruity. Non-Duchenne laughter refers to laughter that is unconnected to any emotional experience, but rather laughter that is originated voluntarily. Duchenne laughter evolved before non-Duchenne laughter with the function of making play and playful emotions contagious. In these situations, laughter serves as an in-group designator. Early evolutionary laughter is also theorized to serve the function of dissolving social tension. During moments of displays of social superiority, laughter could be used to dissolve tensions that otherwise could lead to fighting or exclusion from a group, by designating those situations as play rather than as a real challenge. Duchenne laughter, which should be thought of as emotionally-valenced rather than simply spontaneous, can increase positive affect and mood of an individual as well as a group. So, early laughter most likely provided survival benefits through effects of emotional contagion that served to strengthen within-group ties. Non-duchenne laughter developed later than Duchenne laughter. Non-duchenne laughter was co-opted for a variety of other social situations as laughter and humour already existed. Voluntarily accessing the laughter system that was already in place would serve to strengthen in-group fitness just as genuine, emotional laughter did before it, but now it could be done at will. Thus, non-Duchenne laughter developed to express things like aggression, nervousness, hierarchy positions, and to do things such as manipulate, appease, and make fun of others. Even when non-Duchenne laughter is unconscious, that does not mean it is necessarily emotional or using the same brain pathways as genuine Duchenne laughter. As social situations became more complex in later hominid stages of evolution, so did the functions and usefulness of laughter. As linguistics developed, proto-laughter and proto-humour were both co-opted for assistance in the production of and response to effective communication.

Humour as a Mental Fitness Indicator
It has been hypothesized that intentional humor evolved as indicator of intelligence. Humor is often rated as important in mate selection, and it may be that partners are selecting for genetic fitness. General intelligence predicted higher ratings on humor tasks, even after controlling for Big Five personality factors. Greengross & Miller propose that humour plays into sexual selection. Rather than being sexually attractive for its own sake, humour is attractive because it is an indicator of other things which humour is correlated with, such as intelligence, [creativity], and other desirable traits. Intelligence has been shown to be a mental fitness indicator and is highly sexually desirable for both traits Intelligence and humour ability are positively correlated and the ability to produce humour on the spot predicts mating success. In line with theories regarding sex differences of mating strategies, humour ability was rated higher by a blind panel of judges when produced from males than females. A large proportion of humour is produced during informal conversation and involves the derision of a specific person (either oneself or another). The adaptiveness of deprecating humour in social interactions is a point of interest among researchers. Drawing attention to one’s own faults seems counter-intuitive when considering humour’s function of strengthening within-group fitness and sexual desirability. Other-deprecating humour has functions which are implicated in establishing same-sex rivalries. This sort of humour usually targets fitness indicators of rivals, which can be risky if an opponent perceives the humour as a threat worthy of retaliation. Self-deprecating humour is proposed to fit within cost signaling theory. Greengross and Miller found that self-deprecating humour had predictive value for long-term sexual attractiveness. However, this occurred as an interaction effect, and only was predictive for high-status individuals. Self-deprecating humour may only work for high-status individuals because it ironically points out the desirable traits by way of discrepancy. In low-status individuals, this approach is unproductive, as the humour is pointing to actual weak fitness traits rather than a discrepancy as with high-status individuals.

Humour Style and Psychological Outcomes
There are two adaptive styles of humour and two maladaptive styles of humour. Affiliative and self-enhancing humour are the two adaptive styles. The defining feature of affiliative humour is humour that is used to strengthen interpersonal relationships or ease tensions within those relationships. Self-enhancing humour involves the use of a humourous outlook on situations in life as a coping tool. In this instance, humour is used to mitigate stress without targeting others or the self in a hurtful way. The two maladaptive humour styles are aggressive humour, which uses sarcasm and other humour styles to target or put down others and self-defeating humour, which uses self-deprecating tactics for the enjoyment of others. Martin et al. (2003) found that higher levels of adaptive humour are related to psychological well-being in terms of lower levels of depression and higher self-esteem. Self-defeating humour contrasts with the adaptive types, and is associated with poorer psychological health. Kuiper and McHale (2009) found support for humor styles being mediators between self-evaluation and psychological well-being. Simply put, rather than humour styles directly affecting psychological well-being, they are involved with how people self-evaluate, which results in different amounts of psychological well-being.

In a study examining humour as an intervention, random assignment to a humour group, a social group, and a non-intervention control group was used. A standardized manual and booklet were used in the intervention group, and results showed that the humour group demonstrated significant increases in emotional well-being. Importantly, self-efficacy, positive affect, optimism, and perceptions of control were found to go up while other negative measures decreased. Crawford & Caltabiano (2011) found support for humour as an intervention which may increase positive aspects of emotional well-being. Humour skills of the intervention group were targeted through the use of a manual. Humour increased several measures of well-being including self-efficacy, positive affect, optimism, and perception of control, even more than a “social group” control or a non-intervention control group. The exposure to humour and humour skills training was also found to decrease certain negative aspects of emotional well-being, including perceived stress, certain depressive symptoms, and anxiety.

Benefit vs. Detriment of Humour
Adaptive components of humor show facilitative effects on psychological well-being. Maladaptive styles that were self-focused showed detrimental effects, while maladaptive styles that did not focus on self were unrelated to personal well beings. Self-deprecating humour is the specific component of maladaptive humour that results in decreased psychological well-being, while both of the adaptive styles of humour (affiliative and self-enhancing) are associated with positive psychological outcomes, such as greater self-esteem, lower depression and anxiety levels, and greater endorsement of self-efficacy. It is important to note that the relevant psychological states may have preceded the humour style rather than vice-versa.

Physical health benefits
Humour research includes investigations into the positive benefits of humour, sense of humour, and laughter on physical health. In recent decades, humour research has seen a surge in publications in part because of Norman Cousins and his claims that he became cured from ankylosing spondilitis due to a daily regimen which included humour and laughter.

Humour and immune response
Positive affect is theorized to influence physical health by means of the immune system. The immune system could be influenced positively by humour in a number of ways. The possibilities include simple immunoenhancement, stress moderation, or both. The pleasant experience of humour is thought to positively influence affect so that stress is moderated. The antibody secretory immunoglobin A (S-IgA) is associated with both positive and negative affect states, with negative states decreasing effectiveness and positive states increasing effects of the antibody. Levels of immune response can be predicted by the number of desirable events (and presumably mood) which occur in preceding days to the immune assessment. However, there is also evidence that significant mood changes in either direction can induce an increase in immune response. Laughter as an overt behavior is also associated with immune response, specifically NK cell activity, which are part of the body’s immune response. Glucocorticoids are lower in subjects who laughed while watching a humourous video, and glucocorticoids decrease NK cell activity, so humour theory posits this pathway as a possible mechanism for humour as a benefit to immune responses. However, it is unclear whether these effects on this specific immune response measurement have long-term effects with clinical significance. Using humour as a coping style is a way which these long-term effects on the immune system may be enacted. In one study, levels of S-IgA and the use of humour as a coping style were positively correlated, although the saliva sampling procedure of this study was subsequently called into question.

Humour and stress
Humour is thought to play a role in the levels of stress that people experience, both in the short-term and long-term. Watching a humourous video for 20 minutes can significantly lower stress levels, on a level comparable to 20 minutes of exercise. Since watching a video is more widely feasible than exercising for 20 minutes for large portions of the population, humour researchers hope that the acute anxiety-alleviating effects of humour can be used in a therapeutic setting. It should be noted that while acute benefits of humour may be obtained, this does not guarantee any long term benefits.

Humour and Pain
Humour's effect on pain tolerance is another point of interest within humour research. Hypotheses for this research include the idea that the positive feelings of humour will increase the threshold of pain that a person can endure. These ideas are implicit in some folk wisdom as well as in anecdotes such as Norman Cousins' recovery story. Though not all studies have showed support for the pain-reducing effect of humour, humour and comedy stimuli do have effects on pain tolerance and perception, particularly when pain is assessed after the humour stimuli is completed. Based on the measures of most studies examining pain, it is difficult to tell if simply consuming humourous material is sufficient for pain reduction, or if actual laughter is a necessary component. Further, some studies that used negative affect control groups found that pain thresholds also increased for people experiencing unsettling stimuli, such as a clip from a horror movie. So, humour does have an effect on pain, but it is unclear what exact behavioral requirements are necessary as well as if humour has an effect greater than other emotionally salient experiences.

Issues in Humour Research and Physical Health
Even though the positive benefits of humour have been lauded by popular media and have found some support among scientific research, the field of humour research also has received criticism. The scientific support for the physical benefits of humour are somewhat sparse, and the findings from the existing research have been called in to question in some cases. Humour is assessed differently based on the theories which underpin the research, such as whether humour is a stable personality trait or not. Because of the non-standard measurements of humour in research, it is difficult to tell whether researchers are measuring the same thing across studies. Sense of humour, internal humour response, and laughter can all be targeted to measure humour, but are not necessarily interchangeable. Martin (2001) critiques several studies for not measuring laughter along with their self-report humour measures.

Aside from theoretical issues, the methods of some key humour research was also called into question by Martin. For example, the immune response sampling techniques of some humour research may have not been reliable because of how baseline immune levels were set. According to Martin (2001), within the nine studies assessing S-IgA levels in response to humour, three did not have control groups, five had control groups which involved a documentary viewing where interest was not assessed, and only one study had a negative affect control. Proper use of control groups is among the major issues within humour research. Some experimental findings are encouraging, but no firm conclusions involving humour and physical health where controls were not used correctly can be drawn. Thus, there is only partial support of immune effects of humour.

Humor in marriage
In 2002, a study was conducted on the functions of humor in close relationships. The study examined three types of humor:


 * positive humor, describing positive aspects of humor, such as humor appreciation, attractiveness, and closeness
 * negative humor, describing humor used to express aggression, or humor used in a manipulative manner
 * instrumental humor, measuring the extent to which the person uses humor to avoid tension or tries to smooth over negative feelings

Positive humor is expected to be related to intimacy and marital satisfaction. This relation was true for the wives, but not for the husbands. This suggests that whether or not husbands use positive humor, it has nothing to do with how closely they feel to their partner or their marital satisfaction. Research suggests that instrumental humor is negatively related to marital satisfaction and is an indicator of potential future marital deterioration. Results showed that husbands acknowledged using instrumental humor in their relationship in relation to demand-withdrawal, in which the wife demands and the husband withdraws. Wives, on the other hand, did not acknowledge the use of instrumental humor in this communication pattern. This seems to indicate that men more often withdraw than women, in this case, with the use of humor. Negative humor was not related to any of the other humor measure in the study. This makes sense considering that put-downs or hurtful humor does not tend to lead to laughter or humor appreciation. Negative humor items in the questionnaire given to the participants described expressing negative emotion. Negative humor somewhat correlated with demand-withdrawal for husbands and wives. This humor can be a form of passive aggressiveness where the one using the humor is not taking responsibility for the put-down or hurtful joke, and in doing so, avoiding, or withdrawing from, conflict.

Measuring responses to humor
When someone finds something funny, there are different ways of expressing it. Common responses of humor include laughing and smiling. In 2008, a study was conducted using 155 undergraduate students at North London University in order to measure responses to humor using a British comedy. The participants were divided into one of three categories: watched a video of the comedy, listened to an audiotape of the comedy, or read a script of the comedy. Approximately half of the participants were observed by an overt video camera and half were observed by a covert video camera. Results showed that participants laughed and smiled much more frequently when watching a video of the comedy and listening to the audiotape of the comedy than when reading a script. The difference in the frequency of smiling and laughing between the video and the audiotape was not significant. Participants laughed and smiled more frequently when observed by a covert video camera than an overt video camera. Aspects of the video and audiotape such as visualization of the acting, auditory representation, and also the presence of audience laughter significantly increase the frequency of laughter and smiling.

Organizations associated with humor research

 * The International Society for Humor Studies
 * HumorMatters — Association for Applied and Therapeutic Humor
 * American Humor Studies Association

Category:Humor research