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Electrophysiological Evidence for Sentence Comprehension - Wings

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not provide such an output. In the sentence (6) it would just group [powerful means and<br />

instruments] together.<br />

In computational linguistics shallow parsers are viewed as an alternative to full-sentence<br />

parsing, an alternative with some practical advantages. Per<strong>for</strong>ming only partial syntactic<br />

analysis of the sentence can be useful in many large-scale language processing<br />

applications such as text summarization. When the concept of shallow parsing was<br />

conceived, learning methods were used to recognize patterns in sentences (Ramshaw &<br />

Marcus, 1995). The idea of pattern recognition is suitable <strong>for</strong> applications using neural<br />

networks and this makes it interesting <strong>for</strong> language comprehension modeling.<br />

Apart from applications in computational linguistics, psycholinguistic evidence <strong>for</strong><br />

shallow parsing is available, as well (San<strong>for</strong>d & Sturt, 2002). The evidence includes<br />

underspecifications (Reyle, 1993) as in the following three sentences:<br />

(7) Alice showed all her cameras to a technician.<br />

(8) The technician worked in a big store.<br />

(9) The technicians worked in a big store.<br />

Given the two possibilities, that there is only one technician and that there are more of<br />

them, there should be a difference in reading times between the pairs and showing preference <strong>for</strong> one possible interpretation. However, no such difference is<br />

observed (San<strong>for</strong>d & Sturt, 2002: 383) suggesting that a phrase a technician is<br />

underspecified in (7). Other psycholinguistic evidence include lack of error detection<br />

(and providing wrong answers) in sentences such as<br />

28

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