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"Even economists are finally waking up to this fact. A wind of change is now blowing some human spirit back into the ivory towers where economic theory is made. It is becoming increasingly fashionable for economists, especially the younger, more ambitious ones, to borrow insights from psychologists (and sometimes even biologists) to try to explain drug addiction, the working habits of New York taxi-drivers, current sky-high American share prices and other types of behaviour which seem to defy rationality. Alan Greenspan, the chairman of the Federal Reserve, made a bow to this new trend when he wondered about the "irrational exuberance" of American stockmarkets way back in December 1996 (after an initial flutter of concern, investors ignored him). Many economic rationalists still hold true to their faith, and some have fought back by devising rational explanations for the apparent irrationalities studied by the growing school of "behavioural economists". Ironically, orthodox economists have been forced to fight this rearguard action against heretics in their own ranks just as their own approach has begun to be more widely applied in other social sciences such as the study of law and politics. "

Recent theories in cognitive psychology allow us to understand that emotions are not especially irrational. Rather, they are important in the management of our goals and actions . "We are ambivalent about our emotions. Sometimes they seem to make us think in a distorted way. To say that someone is being emotional is to be insulting. But on the other hand, we regard emotions as important to our humanity. To be without them would be less than human. This ambivalence is depicted in science fiction. Mr Spock of Star Trek is superintelligent and without emotion. But he is a lonely figure - not the person to identify with as one boldly goes across the universe. So the question is, do emotions impede rationality? If we were fully rational, would we need them? Would an intelligent being from another planet have emotions? Would a robot? Are emotions an important part of being human? And if so, how? Perhaps science can help to answer such questions. Most important here has been the work of Charles Darwin. His book published in 1872, The Expression of the Emotions in Man and the Animals, touches on a fundamental dilemma about the nature of emotions, and the way we view them. "