The roles of sequencing and verbal working memory in sentence comprehension deficits in Parkinson's disease

被引:87
作者
Hochstadt, Jesse [1 ]
Nakano, Hiroko
Lieberman, Philip
Friedman, Joseph
机构
[1] Brown Univ, Dept Cognit & Linguist Sci, Providence, RI 02912 USA
[2] St Marys Coll, Dept Psychol, Moraga, CA 94575 USA
[3] NeuroHlth Inc, Warwick, RI USA
[4] Brown Univ, Sch Med, Providence, RI 02912 USA
基金
美国国家航空航天局;
关键词
basal ganglia; frontostriatal circuits; language; executive function; speech deficits;
D O I
10.1016/j.bandl.2005.10.011
中图分类号
R36 [病理学]; R76 [耳鼻咽喉科学];
学科分类号
100104 ; 100213 ;
摘要
Studies of sentence comprehension deficits in Parkinson's disease (PD) patients suggest that language processing involves circuits connecting subcortical and cortical regions. Anatomically segregated neural circuits appear to support different cognitive and motor functions. To investigate which functions are implicated in PD comprehension deficits, we tested comprehension, verbal working memory span. and cognitive set-switching in a non-linguistic task in 41 PD patients; we also obtained speech measurements reflecting motor sequencing processes that may be involved in articulatory rehearsal within working memory. Comprehension of sentences with center-embedded or final relative clauses was impaired when they could not be understood from lexical semantic content alone. Overall comprehension error rates correlated strongly with impaired set-switching and significantly with reduced working memory span and speech motor sequencing deficits. Correlations with comprehension of different sentence structures indicate that these impairments do not represent a single deficit; rather, PD comprehension deficits appear to arise from several independent mechanisms. Deficits in cognitive set-switching or underlying inhibitory processes may compromise the ability to process relative clauses. Deficits in verbal working memory appear to impair comprehension of long-distance dependencies. Speech sequencing correlated with neither set-switching nor verbal working memory span, consistent with their being supported by independent, segregated cortico-subcortical circuits. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:243 / 257
页数:15
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