The thesis of this post is that there are non-intentional mental states. To establish this thesis all I need is one good example. So consider the felt pain that ensues when I plunge my hand into extremely hot water. This felt pain or phenomenal pain is a conscious mental state. But it does not exhibit intentionality. If this is right, then there are mental states that are non-intentional. Of course, it all depends on what exactly is meant by 'intentionality.' Here is how I understand it.
1. M takes an accusative or is directed upon an object O.
2. M's having an object, and having the very object it has, is not a contingent fact about M, but essential to M. O 'enters into the description' of M. Thus if I am imagining at time t, then this imagining is of a definite object, a unicorn, say, and I cannot describe the act of imagining without using the word 'unicorn.' It is constitutive of the act that it have the object it has: an imagining of a unicorn could not have been an imagining of a flying spaghetti monster; nor could the imagining of a unicorn of such-and-such description have been objectless.
3. From the fact that M has O as it object it does not follow that O exists. I cannot own X unless X exists. But I can want X whether or not X exists. 'Wanting' picks out a type of intentional state; 'owning' does not. From the fact that I own a house it follows that at least one house exists. From the fact that I want a house shaped like a rook it does not follow that a rook-shaped house exists.
4. From the fact that M has O1 as its object, it does not follow that M has O2 as its object even if O1 is the same as O2. Suppose I am in Iceland and I see an unkempt, bearded old man in a bookstore. Suppose, unbeknownst to me, that this man is the chess grandmaster who defeated Boris Spassky in 1972. The intentional object of visual perceiving has all and only the properties revealed in the visual perceiving: the properties of being unkempt, bearded, old, etc., but not the property of having defeated Boris Spassky.
As John Searle, puts it, "All intentionality is aspectual." (Rediscovery of the Mind, 131) Seeing is seeing-as. A thing is seen under certain aspects and not others. And what holds for seeing holds for every other intentional state.
We are now in a position to answer the question whether the felt pain described above is an intentional state. It is only if all of the four conditions specified above are met. I will argue that none of them are met.
First, does the felt pain have an object or accusative? One might say that the object of the felt pain is the mean molecular kinetic energy of the water. But this can't be right. For one thing, the felt pain does not present or reveal molecules or the collision of molecules in the way seeing an old man presents or reveals an old man. This is a crucial phenomenological difference and by itself is enough to refute the notion that felt pains are intentional. Or to be precise: it refutes the notion that felt pains have as their intentional objects their physical causes.
Now consider condition (2). The seeing of an old man cannot be what it is unless it is precisely the seeing of an old man. 'Old man' enters of necessity into the description of the act (intentional experience). This seeing could not have been the seeing of a sick dog or of a flat tire or of nothing at all. An intentional state must have an object and it must have the very object it has. So if felt pain is an intentional state and its object is water molecules or else the mean molecular kinetic energy of water molecules, then the felt pain could not exist without exactly that object. But surely there is no conceptual absurdity in the supposition that the felt pain in question exists in a world in which temperature is not mean molecular kinetic enegy. (Consider Lavoisier's world in which caloric has pride of place.) 'Mean molecular kinetic energy' (MMKE) does not enter of necessity into the description of a felt pain even when said pain is caused by MMKE of a certain degree.
Condition (3) is also not satisfied by felt pain. If the intentional object of felt pain is the extramental cause of felt pain, then one would be able to infer the existence of the object from the existence of the pain. But one cannot infer the existence of the intentional object of an intentional state from the existence of the state. Ergo, etc.
The major premise is true because, if X causes Y, then both X and Y must exist. (Causation is a relation, and every relation is such that, if one relatum exists, then so does the other.) But if X is the intentional object of Y, then, while Y must exist, X need not exist. For this reason, Franz Brentano denied that intentionality is a relation, maintaining instead that it is relation-like, ein Relativliches.
Finally, condition (4) is not satisfied. Suppose I see Big Joe walking towards me. Unbeknownst to me, Joe has just been elected sheriff. Even though Big Joe = the sheriff, from the fact that Big Joe is my intentional object it does not follow that the sheriff is. I see the man as Big Joe and not as the sheriff even though Joe is the sheriff. (The as-structure or aspectuality or perspectivity of intentionality is essential to it.) But if the intentional objects of felt pains were their physical causes, then, from the water's physical temperature being the intentional object of the felt pain it would follow that a certain degree of MMKE would be the intentional object of the felt pain, since temperature = MMKE. But this does not follow. Therefore, the intentional objects of felt pains are not their physical causes.
But there is no other reasonable candidate for the office of being the intentional object of a felt pain. So I conclude that felt pains are non-intentional mental states.
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