1. What is the mark of the mental? Brentano took intentionality to be the mark of the mental, the criterion whereby physical and mental phenomena are distinguished. For Brentano, (i) all mental phenomena are intentional, (ii) all intentional phenomena are mental, and (iii) no mental phenomenon is physical. (Franz Brentano, Psychologie vom empirischen Standpunkt (1874), Bk. II, Ch. 1.)
2. What is intentionality? ‘Intentionality’ is Brentano's term (borrowed from the Medievals) for that property of mental states whereby they are (non-derivatively) of, or about, or directed to, an object. The state of perceiving, for example is necessarily object-directed. One cannot just perceive; if one perceives, then one perceives something. The same goes for intending (in the narrow sense), believing, imagining, recollecting, wishing, willing, desiring, loving, hating, judging, knowing, etc. Such mental states refer beyond themselves to objects that may or may not exist. Reference to an object is thus an intrinsic feature of mental states and not a feature they have in virtue of a relation to an existing object. This is why Brentano speaks of the "intentional in-existence of an object." Mental states for Brentano are object-directed by their very nature as mental states: there is no need that a particular state's object actually exist for that state to be intentional. It follows that intentionality is not, strictly speaking, a relation. For, necessarily, if a relation obtains, then all its relata exist. In the case of an intentional 'relation,' however, the object-relatum need not exist.
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