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).
âOnly when we are so old, only, we are aware of the beauty of life.â Alice Herz Sommer, age 106. A few weeks ago I was in a university library when I happened upon a book quite by accident called Gerotranscendence: A Developmental Theory of Positive Aging by Lars Tornstam, PhD (2005) .s Tornstam puts it, many of us have a tendency to define the present age or time of life as the best one and how the rest of life/our lives should be. We can understand that this may not be true in retrospect, but have difficulty doing so in prospect.