Laughter and crying may be opposite extremes of the emotional spectrum, but think how often one leads into the other. Both are released from deep within the body moving outward to express the degree of stability the BodyMind is experiencing at that moment. In early development when posture is still uncertain and in experimental stages vocal sound is allowed greater freedom of emotional expression. Since children unconsciously associate vocal sound with movement it seems safe to assume that audible emotional resonance is a totally integrated BodyMind expression. When awake at this age experimenting never ceases.
Sustained noises play around the infant's lips as emotions find release in sound experimentation.
This same oral experience continues on through later infancy to further refinement as the child adds word shapes to sustained sound. At some time in the earlier years, however, the socially imposed conditioning thought necessary in achieving maturity begins blocking free vocal experimentation. Add to that mental image one of a little girl absently singing to herself as she plays in the sandbox, or a little boy skipping down the sidewalk singing to himself in rhythm to his movements. Both are perfect examples of spontaneous, uninhibited vocal sound. It is said that maturity is responsibility for one's actions.