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Humor research

Study of the effects of humor

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Through Linguistics, History and Literature

Areas

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

Neuroanatomy of humor

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 humor and laughter. The production of laughter involves two primary brain pathways, one for involuntary and one for voluntary laughter (i.e., Duchenne and non-Duchenne laughter). Involuntary laughter is usually emotionally driven and includes key emotional brain areas such as the amygdala, thalamic areas, and the brainstem. Voluntary laughter, however, 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 humor response occurs in two separate waves of activity supports the idea that humor processing occurs in two stages.

Functional MRI and PET studies further illuminate which parts of the brain are participating in the experience of humor. A study by Ozawa et al. (2000) found that when participants heard sentences that they rated as humorous, the Broca's area and the middle frontal gyrus were activated. Additionally, Wernicke's area and the transverse temporal gyri were activated, but these areas were also found to be active in control (non-humorous) conditions.

Another study using fMRI showed that the linguistic basis of jokes participants found to be humorous impacted which parts of the brain were activated. 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, as were the left posterior inferior temporal gyrus, the right posterior middle temporal gyrus, and the cerebellum. Brain activity in the medial ventral prefrontal cortex was associated with ratings of funniness that the participants gave after the brain scan and initial humor response. This response may stem from the mood or emotional change that occurs after hearing humor.

Induction of laughter through direct brain stimulation has been reported in a number of studies, and includes areas such as anterior cingulate cortex (ACC), globus pallidus, floor of the third ventricle, and most recently left superior frontal gyrus – though these results are hard to draw inferences from (may be inhibitory, may be artefacts, etc.) Because the nature of laughter is so complex—involving facial muscles, respiratory actions, etc.--a control center has been hypothesized in the upper pons.

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 humor 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 humor and laughter than other animals. The evolution and functions of laughter and humor have been explored in an attempt to understand how and why humor and laughter have become part of human existence. Research by Scott et al. (2014) states that social functions of laughter strengthens bonds within groups and help coordinate social interactions. They argue that laughter is also heavily shaped by social context, that laughter goes beyond just responding to something they think is "humorous," but also to communicate in other ways.

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 humor 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-humor were both co-opted for assistance in the production of and response to effective communication.

Humor 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 humor plays into sexual selection. Rather than being sexually attractive for its own sake, humor is attractive because it is an indicator of other things which humor 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 humor ability are positively correlated and the ability to produce humor on the spot predicts mating success.

A large proportion of humor is produced during informal conversation and involves the derision of a specific person (either oneself or another). The adaptiveness of deprecating humor in social interactions is a point of interest among researchers. Drawing attention to one's own faults seems counter-intuitive when considering humor's function of strengthening within-group fitness and sexual desirability. Other-deprecating humor has functions which are implicated in establishing same-sex rivalries. This sort of humor usually targets fitness indicators of rivals, which can be risky if an opponent perceives the humor as a threat worthy of retaliation. Self-deprecating humor is proposed to fit within cost signaling theory. Greengross and Miller found that self-deprecating humor 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 humor 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 humor is pointing to actual weak fitness traits rather than a discrepancy as with high-status individuals.

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