Intentionality
The term "intentionality" was used by Jeremy Bentham to distinguish between actions that are intentional and those that are not. It was reintroduced by Edmund Husserl in connection with certain doctrines set forth in Franz Brentano's Psychologie vom empirischen Standpunkt (1874). The word is now used primarily in this second sense.
Brentano wrote:
Every mental phenomenon is characterized by what the scholastics of the Middle Ages called the intentional (and also mental) inexistence of an object, and what we would call, although not in entirely unambiguous terms, the reference to a content, a direction upon an object (by which we are not to understand a reality …), or an immanent objectivity. Each one includes something as an object within itself, although not always in the same way. In presentation something is presented, in judgment something is affirmed or denied, in love [something is] loved, in hate [something] is hated, in desire something is desired, etc.
This intentional inexistence is exclusively characteristic of mental phenomena. No physical phenomenon manifests anything similar. Consequently, we can define mental phenomena by saying that they are such phenomena as include an object intentionally within themselves. (Op. cit., Vol. I, Book II, Ch. 1)
This passage contains two different theses: one, an ontological thesis about the nature of certain objects of thought and of other psychological attitudes; the other, a psychological thesis, implying that reference to an object is what distinguishes the mental or psychological from the physical.
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