• 한국음향학회:학술대회논문집
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• 한국음향학회 1999년도 학술발표대회 논문집 제18권 2호
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• pp.337-340
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• 1999

The most salient and discussed features of speech production in agrammatic aphasia are the omission and substitution of grammatical morphemes. Cross-linguistic studies have shown that the pattern of omission/substitution is not random but occurs in a systematic and highly constrained way. Although these descriptions are important, they do not explain why all grammatical morphemes are not equally impaired. Friedmann and Grodzinsky (1997) proposed the Tree-Pruning Hypothesis (TPH) to account for these patterns of sparing and loss. The TPH claims that in an agrammatic representation, an impaired functional node is underspecified, thus allowing inappropriate affixation to occur. Additionally, whenever a node is impaired, all nodes above it will also be impaired. Using four types of narratives collected from two Korean agrammatic patients, We test the claim that the impairment in agrammatism is based on such hierarchical representation. It was found that these patients consistently produced appropriate grammatical morphemes that are higher in a syntactic tree than the impaired morphemes. The finding that an intact node exists higher than an impaired node refutes the TPH.

• 인지과학
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• 제13권2호
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• pp.15-23
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• 2002

This paper reports an experiment on Broca's aphasics' comprehension of a class of English constructions involving empty categories. Based on Grodzinsky's (1986) account of chance-level performance of agrammatic understanding of movement constructions and their thematic role assignments. I show that Grodzinsky's notion of invisible empty categories can be further extended to include pronomical anaphors (PRO's) in Chomsky's (1981) sense and that the asymmetry in their poor comprehension of subject- and object-control constructions can be explained by the heuristic mechanism of the default thematic role assignment rule. eventually supporting Grodzinsky's claim that empty categories are not visible In agrammatic's syntactic representation.

• 대한치매학회지
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• 제17권3호
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• pp.110-119
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• 2018

Background and Purpose: To analyze $^{18}F-THK5351$ positron emission tomography (PET) scans of patients with clinically diagnosed nonfluent/agrammatic variant primary progressive aphasia (navPPA). Methods: Thirty-one participants, including those with Alzheimer's disease (AD, n=13), navPPA (n=3), and those with normal control (NC, n=15) who completed 3 Tesla magnetic resonance imaging, $^{18}F-THK5351$ PET scans, and detailed neuropsychological tests, were included. Voxel-based and region of interest (ROI)-based analyses were performed to evaluate retention of $^{18}F-THK5351$ in navPPA patients. Results: In ROI-based analysis, patients with navPPA had higher levels of THK retention in the Broca's area, bilateral inferior frontal lobes, bilateral precentral gyri, and bilateral basal ganglia. Patients with navPPA showed higher levels of THK retention in bilateral frontal lobes (mainly left side) compared than NC in voxel-wise analysis. Conclusions: In our study, THK retention in navPPA patients was mainly distributed at the frontal region which was well correlated with functional-radiological distribution of navPPA. Our results suggest that tau PET imaging could be a supportive tool for diagnosis of navPPA in combination with a clinical history.

• 인지과학
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• 제9권1호
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• pp.41-46
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• 1998

이 논문에서는 뇌졸중으로 인한 Broca 유형의 실어증 환자가 회복 초기와 회복이 진행됨에 따라 발화하는 서술어의 논항 구조적 속성이 정상 언어 집단의 서술어 분포와 어떻게 다르며, 또한 편으로는 전도 실어증 환자의 서술어 분포와는 어떻게 다른지 세 환자와, 조건이 비슷한 정상인의 자유 발화 산출 자료를 분석하여 비교한다. Broca 유형 실어증 환자가 발화하는 서술어 중에서 비대격 동사가 차지하는 비율을 언어간 비교해 본 결과, 영어 실어증 환자의 경우에는 계사가 아닌 비대격 동사에 심한 어려움을 겪어 거의 산출되어 못하는 것으로 나타난 반면(Kegl 1995), 한국어 실어증 환자의 경우에는 별다른 어려움을 겪지 않는 것으로 나타났다. 이에 대한 설명으로 영어의 비계사 비대격 구문에서는 d-구조와 s-구조 사이에서 동사에 상대적인 논항 이동이 일어나는 데 반해, 한국어에서는 격 부여라는 동기로 유발되는 그러한 논항 이동이 없거나, 설사 있더라도 공허하기(vacuous) 때문에 비문법적 실어증 환자들이 어려움을 느끼지 않으리라는 제안을 한다.