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).
What is Familial Alzheimerâs? Familial Alzheimerâs disease (FAD) is a rare form of Alzheimerâs that is entirely passed down through family, being inherited from a parent. FAD accounts for between 2-3% of all cases of Alzheimerâs and usually has a much earlier onset than other types of Alzheimerâs, with symptoms developing in their 30s or 40s.