I think it's possible to a certain extent to make those comparisons. The problem is the detail with which the comparison can be made. Of course, the first place to make such a comparison would be to ask for a testimony from different people and have people report on what they experience.

It's very interesting to think about the distinction with mind, which I just made in very general terms, but it can be made more profound when we think that there are many species, many creatures on earth that are very likely to have a mind, but are very unlikely to have a consciousness in the sense that you and I have.

There is a sequence of events in our lives and so there's a temporal aspect to our experience that brings by itself, sense into the story. In other words, you were not walking before you were born and you were not doing X and Y before you did something else first. So there's a sequencing of events that imposes a certain structure to the story.

But whether we want to do it because we want to have people to have a different idea of who we are or not, we do it naturally. So the way we construct our narrative is different from the way we constructed it a year ago. The difference is maybe very small or it may be huge.

So, you can define emotions very simply as the process of perceiving what is going on in the organs when you are in the throws of an emotion, and that is achieved by a collection of structures, some of which are in the brain stem, and some of which are in the cerebral cortex, namely the insular cortex, which I like to mention not because I think it's the most important, it's not.

Emotion operates, very often when you think about how you react to the world, you know, something is happening to you, you're simply going along and you're being confronted by different things, not necessarily very important or significance for your ultimate life, but you are constantly reacting to the world.

When you deal with something like compassion for physical pain, which we know is very, very old in evolution - we can find evidence for it in nonhuman species - the brain processes it at a faster speed. Compassion for mental pain took many seconds longer.