Overview
Laughter is a characteristic human expression and sound that commonly signals amusement, pleasure, or social connection. It typically involves rhythmic, repeated exhalations and vocalizations that are coordinated with facial movements, especially a smiling mouth. Although laughter most often accompanies things perceived as funny, it also appears in a variety of other emotional contexts, including nervousness, embarrassment, relief, or even contempt.
Characteristics and production
Physiologically, laughter is produced by coordinated action of the respiratory system, the larynx and facial muscles. A typical laugh consists of a series of short, audible breaths with variable pitch and intensity. People describe different qualities of laughter—such as chuckles, giggles, snorts, guffaws and cackles—based on loudness, duration and the part of the vocal tract that predominates. Some people emphasize throat sounds; others use the nasal passages or more vocalized tones.
Forms, writing and representation
In writing and online communication, laughter is represented in many ways. Traditional transcriptions include "ha ha," "heh," "hehe," or "haha," while abbreviations such as "LOL" (laughing out loud) are common in digital messages. Performers, writers and actors use different types of laugh to convey character: a timid giggle differs from a loud guffaw or a sardonic snort. For information about the sound of laughter as a vocal phenomenon, see vocal sound.
Development and history
Human infants begin to laugh early in life, typically within the first few months; an often-cited age range is around three to four months. Early laughter may start as an expression of surprise or an involuntary vocal reaction, and it quickly becomes a powerful social cue that elicits responsive smiles and mirroring from caregivers. Cultural practices influence when and how people laugh, but the capacity to laugh appears to be widespread across human societies.
Social functions, benefits and examples
Laughter plays several social and psychological roles. It helps build and maintain social bonds, signals shared understanding, reduces tension in awkward situations, and can act as a nonverbal form of communication. Many people report that laughter reduces stress temporarily, increases feelings of connection, and may raise pain tolerance. Laughter also features in organized activities such as comedy, group entertainment and therapeutic settings. Common everyday triggers include jokes, playful teasing, unexpected situations and physical tickling—people often laugh when they hear a joke or are tickled.
Contagion, culture and notable facts
Laughter is notably contagious: hearing someone laugh often provokes laughter in listeners, a phenomenon linked to social mirroring and empathy. Television and online platforms have amplified this effect; for example, clips of laughing infants or comic moments circulate widely on sites such as YouTube. Public figures have sometimes reacted visibly to such clips—an often-cited anecdote describes a royal visit to Google headquarters where the monarch and the Duke of Edinburgh were reported to laugh together at a video.
Distinctions and disorders
Not all laughter is a sign of genuine amusement. "Nervous laughter" can accompany fear or discomfort, and pathological conditions such as pseudobulbar affect produce inappropriate or involuntary episodes of laughing and crying. In clinical and social contexts it is important to distinguish spontaneous, socially motivated, and neurologically driven laughter to understand underlying causes and responses.
Types (summary)
- Giggle: light, high-pitched, often associated with amusement or nervousness.
- Chuckle: quiet, restrained laugh.
- Guffaw: loud, hearty laugh.
- Snort or cackle: laughter with notable nasal or harsh sounds.
Social Meaning
In human interaction, laughter is understood as an expression of sympathy and mutual agreement and thus has a calming, conflict-limiting effect that is conducive to living together in groups. Unproven, but not improbable, is the assessment of some researchers that laughter is one of the fundamental forms of human communication, which, in the history of mankind, clearly precedes the development of language. Evidence for this is the fact that laughter is triggered and controlled in a brain region that is significantly older than the language centre.
In his 1963 book Das sogenannte Böse (The So-Called Evil), Konrad Lorenz originally interpreted laughter as a threatening gesture that arose from snarling. It showed that someone had a healthy set of teeth, thus demonstrating strength. Within a group, however, it had and has something unifying: To show one's teeth to each other means to be part of a strong community and an equal partner within the group. Laughter is usually joyful. Laughter can also occur in actually malicious situations (sarcastic laughter).
Laughter is loud laughter, usually in company. In a cheerful group, laughter gains a high momentum of its own. From a social psychological point of view, excessive, disinhibited laughter is virtually a victory of the body over the power of the otherwise dominant mind.