In some cases,
cognitive biases make our thinking and decision-making faster and more
efficient. The reason is that we do not
stop to consider all available
information, as our thoughts proceed down some channels instead of others. In
other cases, however, cognitive biases can lead to errors for exactly the same
reason. An example is confirmation bias, where we tend to favor information
that reinforces or confirms our pre-existing beliefs. For instance, if we
believe that planes are dangerous, a handful of stories about plane crashes
tend to be more memorable than millions of stories about safe, successful
flights. Thus, the prospect of air travel equates to an avoidable risk of doom
for a person inclined to think in this way, regardless of how much time has passed
without news of an air catastrophe.