Moving away from "the noisy, promiscuous pronouncement of childhood," the subdued weeping of adulthood "favors the face-to-face encounters of an intimate setting."
The human body is an extraordinary machine, and our behavior an incessant source of fascination. In Curious Behavior: Yawning, Laughing, Hiccupping, and Beyond (public library), psychology and neuroscience professorRobert R. Provine undertakes an "analysis and celebration of undervalued, informative, and sometimes disreputable human behavior" by applying the lens of anthropologically-inspired, observational "Small Science" -- "small because it does not require fancy equipment and a big budget, not because it's trivial" -- to a wealth of clinical research into the biology, physiology, and neuropsychology of our bodily behaviors.
Take, for instance, the science of what we call "crying," a uniquely human capacity -- a grab-bag term that consists of "vocal crying," or sobbing, and "emotional tearing," our quiet waterworks. Provine explains:
As an adult, you cry much less than when young, and your crying is more often subdued, teary weeping than the demonstrative, vocal sobbing of childhood. . . [T]he trauma that causes your crying is now more often emotional than physical. However, whether intentional or not, as adult or child, you cry to solicit assistance, whether physical aid or emotional solace. Paradoxically, your adult cry for help is more private than the noisy, promiscuous pronouncement of childhood, often occurring at home, where it finds a select audience. The developmental shift from vocal crying to visual tearing favors the face-to-face encounters of an intimate setting. The maturation of inhibitory control gives adults the ability to select where and when crying occurs, or to inhibit it altogether, options less available to children.
To better illustrate the physiology of crying, Provine contrasts it with that of laughing, pointing out that the two are complementary behaviors and understanding one helps understand the other.
Specialists may argue whether there is a typical cry or laugh, but enough is known about these vocalizations to provide vivid contrasts. A cry is a sustained, voiced utterance, usually of around one second or more (reports vary), the duration of an outward breath. Think of a baby's 'waaa.' . . . Cries repeat at intervals of about one second, roughly the duration of one respiratory cycle . . . A laugh, in contrast, is a chopped (not sustained), usually voiced exhalation, as in 'ha-ha-ha,' in which each syllable ('ha') lasts about 1/15 second and repeats every 1/5 second.