Another way their evolution could have affected them is if their reproduction strategy was different than ours. If they had extremely large numbers of offspring (instead of the few we humans have), they might not emphasize individual survival as strongly as we do, and might value competition and risk-taking so as to keep only the fittest children.
I don't know how seriously I can take this kind of speculation, though. Unfortunately, we only have one data point to work with when it comes to technologically advanced species.
That was great! A previous discussion about "Three Worlds Collide:" http://news.ycombinator.com/item?id=1387771
If you're not careful when you read it, you miss the True Ending: http://lesswrong.com/lw/yb/true_ending_sacrificial_fire_78/