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Electrophysiological Evidence for Sentence Comprehension - Wings

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the <strong>for</strong>mulation of the models that could explain how particular elements of language<br />

behavior could be impaired due to different positions of brain lesions (e.g. Wernicke-<br />

Geschwind model (Geschwind, 1972)). These two types of models operated with<br />

different notions: while phonological encoding, noun phrase or thematic relations are the<br />

building blocks of the <strong>for</strong>mer, production, sound images or disconnections were the<br />

notions typically encountered in the later models. Although today all models must<br />

provide a neurobiologically plausible picture of language-related processes, in this<br />

introduction the distinction between the psycholinguistic and neurolinguistic models will<br />

be kept in order to emphasize the in<strong>for</strong>mation processing motivation of the <strong>for</strong>mer<br />

models and the interest in the brain substrate of the language function and its explanation<br />

in terms of other cognitive processes of the latter.<br />

1.2.1. Psycholinguistic models<br />

Serial processing and parallel processing models. Understanding sentences is<br />

fundamentally different from understanding words. While the process of word<br />

comprehension must involve some kind of checking the input against items stored in<br />

memory, the meaning of a sentence is constructed on line and the number of possible<br />

sentences is unlimited. Psycholinguistic models of sentence comprehension try to link the<br />

elements of grammar (phonology, morphology and syntax) to semantics; in other words<br />

sentence comprehension is viewed as some sort of mapping from <strong>for</strong>m to meaning.<br />

Generally, there are two groups of psycholinguistic models: serial processing and<br />

parallel processing models, depending how they view the time-course of the processes.<br />

In serial processing models the parser builds the sentence structure in a step-by-step<br />

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