While most of the articles and studies I have seen suggest that advanced directives do help individuals and their families make the difficult decisions regarding medical care, people can and do change their minds. Some interesting insights into the why. Quote:
Cognitive scientists use the term “focalism” to refer to a narrow focus on what will change in one’s life while ignoring how much will stay the same and still can be enjoyed. Another insight from cognitive psychology that is relevant to the changes in preferences for many patients is “buffering.” People generally fail to recognize the degree to which their capacity to cope will buffer them from emotional suffering. The often unconscious processes of denial, rationalization, humor, intellectualization and compartmentalization are all coping mechanisms that patients employ to make their lives endurable, indeed, even fulfilling, when ill.