Language
Language as a species-specific ability in humans is
intrinsic to the development of knowledge and understanding. It endows us with
a capacity unique to the human species to structure and organize experiences
through the manipulation of categorical and abstractconcepts. With increasing
internalization of language comes the capacity for disengagement from the
environment so that concepts exist independently of their immediate context, as
internal repre-sentations. Through this capacity to organize and form internal
rep-resentations of experiences, a stable construction of reality is made
possible (Bunowski and Bellugi, 1970; Guidano and Liotti, 1983).
Language is thus an integral part of mentation.
Language is also central to modes of communication. Both of these aspects of
language have been subjects of study for many disciplines, including
philosophy, psycholinguistics, psychology and cogni-tive sciences. Furthermore,
the disconnection of language from other cognitive processes and the
disruptions in its communica-tive functions have been subjects of investigation
in the fields of neurology, neurosurgery, neurophysiology and neuropsychology.
Multidisciplinary efforts have led to a burgeoning body of re-search on language
in normal and brain-damaged individuals, and the converging findings have
greatly advanced our understanding of language as a complex human ability.
Regardless of the discipline within which the study
of lan-guage is attempted, its essential features are common. Language is
governed by a set of rules that link its various components. The ba-sic units
of a sound-based language (e.g., as opposed to a sign-based language) are
classified in terms of phonemes, morphemes, lexi-con, syntax, semantics,
prosody and discourse. Phonemes are the smallest units of sound; morphemes are
the smallest meaningful word units that when combined form words; syntax refers
to the relational features by which words are combined, that is, grammar;
lexicon refers to the words or vocabulary of a language; semantics refers to
the meaning of words and sentences; prosody means the inflection and rhythm of
utterances; and discourse involves the combination of sentences within any
given context and constitutes narratives (Damasio and Damasio, 1992).
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