A big finding is that people plan for things they should do over the longer term but, in the present, do what they want; and the two aren't consistent: the angel-and-devil-on-separate-shoulders-whispering-in-the-ears scene. An example that most people can relate to is gym membership. On average, people pay big bucks for the long-term membership but could save by paying a fee based on actual attendance. What they want to do in the long run (the "should") doesn't match what they actually do in the short run ( the "want").
The "should/want" conflict melds the disciplines of economics and psychology and is worth thinking about as it relates to the whole investing process. Too often, academic disciplines don't take advantage of each other's work which, IMHO, is unfortunate.