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).
These people are aging poorly in their midlife and will continue to deteriorate in older age with their poor lifestyle. What I mean is that if someone lives off of fast food and TV watching (or cookies and playing around on his computer, hint hint for myself), then the continuity theory will predict aging poorly. Disengagement Theory. Lesson Summary. Unlock Your Education. See for yourself why 10 million people use Study.com. Become a Study.com member and start ...