You're not the same after, say, an incredible love affair that went very well or a love affair that went bad. Or something that happens to your health, or something that happened to somebody else's health, that is close to you. Or something that happens professionally.

There's something that intervenes and is very important which has to do with value. Value in the true biological sense, which is that contrary to what many people seem to think, taking it at face value - sorry for the pun - we do not give the same amount of emotional significance to every event.

If you have just an emotion, you would not necessarily feel it. To feel an emotion, you need to represent in the brain in structures that are actually different from the structures that lead to the emotion, what is going on in the organs when you're having the emotion.

Rather than being a luxury, emotions are a very intelligent way of driving an organism toward certain outcomes.

You're not the same after, say, an incredible love affair that went very well or a love affair that went bad. Or something that happens to your health, or something that happened to somebody else's health, that is close to you. Or something that happens professionally.

More may have been learned about the brain and the mind in the 1990s - the so-called decade of the brain - than during the entire previous history of psychology and neuroscience.

People who are great thinkers, in science or in art, people who are great performers, have to have that kind of capacity. Without that kind of capacity, it's extremely difficult to manage a high level of performance because you're going to get a lot of extraneous material chipping away at the finery of your thinking or the finery of your motor execution.