Prior to studies of unusually intelligent people that showed them to be generally much better adapted and happier than others, the popular belief in … - Robyn Dawes

Finally, the irrationality resulting from incomplete specification can be affected by emotions in a very simple way. If the conclusion is consistent with our desires or needs, the specification may not be examined in detail—in particular, not examined for its incompleteness. How often, when we conclude what we wish to conclude, do we then decide to subject our conclusion to detailed scrutiny? On the other hand, when the conclusion is one that contradicts our wishes and needs, then clearly there is a motive to examine our logic. Then we reconsider or even restructure the possibilities, question whether we have examined them all, and so on.

The limitation of the story to a single sequence and the essentially ad hoc nature of causal attributions call into question the whole procedure of using stories as evidence, and of thinking that they establish causality or patterns of reasons.

Two biases of memory, however, tend to enhance the illusory nature of our retrospective “understanding” of our own and others’ lives. The first is that we tend to overestimate specific events relative to general categories of events. The second is that we tend to recall specific events and to interpret them in ways that make sense out of a current situation—“sense” in terms of our cultural and individual beliefs about stability and change in the life course. Thus, memories, which appear to be beyond our control as if we are observing our previous life on a video screen, are like anecdotes in that they are often (inadvertently) “chosen for a purpose.” The result is that they will tend to reinforce whatever prior beliefs we have, just as anecdotes tend to reinforce the points they are meant to illustrate.