The areas of the tongue sensitive to tastes. The classical theory about the physiology of taste recognizes the existence of four fundamental tastes - sweet, salty, sour and bitter - each being perceived by specific areas of the tongue by means of gustatory receptors, also known as taste buds.
Theories of Aging. Theories of Aging. Erik Erikson, who took a special interest in this final stage of life, concluded that the primary psychosocial task of late adulthood (65 and beyond) is to maintain ego integrity (holding on to one's sense of wholeness), while avoiding despair (fearing there is too little time to begin a new life course).
aging. A technique for evaluating the composition of a firm's accounts receivables to determine whether irregularities exist. It is carried out by grouping a firm's accounts receivables according to the length of time accounts have been outstanding. For example, a financial analyst may use aging to determine whether a firm carries many overdue debtors that may never pay their bills. 1  Facebook.