The earliest clinical sign associated with deafness evoking Usher syndrome is late walking. The electroretinogram is the only reliable examination to enable the diagnosis. When severe profound deafness is associated with late walking, the electroretinogram should be systematically proposed. Logopedic results are linked to precocity of implantation, and early Usher's diagnosis contributes to optimize speech therapy.
Numerous grammatical items can only be understood if the context is taken into account. In order to provide a formal treatment of this problem, we introduce the nonon of knowledge base into linguistics. After having worked out a hard core system of rules for analysing numerals, definite articles, and indefinite articles, we give a thorough study of the French singular definite article le. This grammatical item has the particularity of not encoding a fixed information stored in the lexicon, but of running a program ofinformation processing We show that the referential computation can be made by a precise algorithm working on a definite stratum of the reader's knowledge base. In this framework, the uniqueness hypothesis of Russell becomes a guideline to retrieve memorized information. The algorithm accounts for deictic as well as anaphoric referential identifications. Our analysis proposes a unitary account for a large part of empirical data and reconciles the logical approach of Russell-Montague with the pragmatic approach of Hawkins.
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