Abstract

Four philosophical problems--predication, speech acts, rules, and innate ideas--are discussed in the light of their implications for psychological and linguistic research. The discussion of predication concerns both form and use. With respect to form, it is argued that our lexical memory is organized according to a predicate-argument formula that underlies the subject-predicate form of our sentences. With respect to use, it is argued that the illocutionary force of the sentence as a speech act must be taken into account. Both the formation and the use of such verbal constructions are normally characterized by systems of rules, but there is no clear account of what a rule is or how it might operate to control behavior, and this problem is especially difficult when, as in language, the person's knowledge of the rules is implicit. The innate basis for our human ability to acquire linguistic rules is considered and the problem of innateness is redefined around the conjecture that there are innate, language-specific mechanisms unique to human beings. The problem of investigating such language-specific mechanisms psychologically, however, is quite difficult at the present time.