A feature of experience is subjective if it can in principle be understood only from one type of point of view: that of a being like the one having t… - Thomas Nagel

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A feature of experience is subjective if it can in principle be understood only from one type of point of view: that of a being like the one having the experience, or at least like it in the relevant modality. The phenomenological qualities of our own experiences are subjective in this way. The physical events in our brains are not. Human physiologists may take a special interest in them; but they can, in principle, be understood just as well, or even better, by creatures totally unlike us in physical and mental structure. To understand them such creatures need not take up our point of view. Physical brain processes can be understood objectively, from the outside, because they are not subjective phenomena. And no description or analysis of the objective nervous system, however complete, will ever by itself imply anything which is not objective, i.e. which can be understood only from one kind of viewpoint, that of the being whose states are being described. One cannot derive a pour soi from an en soi.