Why can't we stick to our goals? Blame the sloppy engineering of evolution. ... We're the only species smart enough to plan systematically for the future -- yet we remain dumb enough to ditch even our most carefully made plans in favor of short-term gratification. ... Trying to remember what to do next can be a little like trying to remember what you had for breakfast yesterday: There are too many breakfasts and too many yesterdays for our biological memories to keep track of.
planning goals future memory evolution short-term long-term brain psychology