A mental item is given its intentionality by an act of meaning (Meinen).
There are two kinds of meaning: one kind is that which gives significance to
a word, and the other kind is that which gives sense to a proposition. ‘Each
meaning is . . . either a nominal meaning or a propositional meaning, or, still
more precisely, either the meaning of a complete sentence or a possible part
of such a meaning’ (LI vi. 1).
Every mental act will be an act of a certain kind, belonging to a
particular species, which will be determined by its matter. Every thought
of a horse, whoever’s thought it is, belongs to the same species; and the
concept horse is precisely the species to which all these thoughts belong.
Similarly, whenever anyone makes the judgement that blood is thicker
than water, the meaning of that judgement, the proposition blood is thicker
than water, is precisely the species to which all such acts of judgement belong.
If A agrees with the judgement of B, then while A’s judgement and B’s
judgement are distinct individual mental events, they are, because they
have the same matter, instances of the same species. In his later writing
Husserl called the individual act the noesis and the specific content the noema.
In addition to having matter, acts have qualities. It is not only words and
sentences that have meaning, and not only the corresponding mental acts
and states, such as knowing and believing. So too do perception, imagin-
ation, emotion, and volition. My seeing Rome and my imagining Rome are
acts that have the same matter, or intentional object, but because seeing is
different from imagining, they are acts of different quality (LI vi. 22).
Husserl’s theory of intentionality was a fertile one, and his account of it
contains many shrewd observations and valuable distinctions. But the
nature of the act of meaning, which underpins the universe of mental
phenomena, remains deeply mysterious. In the 1920s and 1930s some
philosophers attempted to present a philosophy of mind that would
dispense altogether with intentionality. Bertrand Russell, in his Analysis of
Mind, presented an account of desire that made it definable in terms of the
events that brought it to an end. ‘A mental occurrence of any kind—
sensation, image, belief or emotion,’ he wrote,
may be a cause of a series of actions continuing, unless interrupted, until some
more or less definite state of affairs is realized. Such a series of actions we call a
‘behaviour cycle’. . . . The property of causing such a cycle of occurrences is called
‘discomfort’ . . . the cycle ends in a condition of quiescence, or of such action as
tends to preserve the status quo. The state of affairs in which this condition of
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