11 Impaired and Preserved Semantic Memory Functions in Dementia

Diesfeldt, Han

doi:10.1016/s0166-4115(08)60938-3

Cited by 39 publications

(36 citation statements)

References 35 publications

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“…1994, Patterson and Hodges 1992, Schwartz et al 1979 have found that there is an association between the severity of semantic naming impairment (which is manifest in semantic errors on confrontation naming tasks) and the production of regularization errors when reading aloud low-frequency exception words. This association has also been observed with Dutch-speaking patients (Diesfeldt 1992), Italian-speaking patients (Miceli and Caramazza 1993) and Japanese-speaking patients (Patterson e t al. 1995).…”

Section: Anomia and Dyslexiamentioning

confidence: 52%

Anomia and dyslexia in Chinese: A familiar story?

Weekes¹,

Chen²,

Qun³

et al. 1998

Aphasiology

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We report a study investigating the factors that predict the naming performance of four Chinese-speaking anomic patients. The results showed that the rated familiarity of an item predicts naming performance for all of the patients, a finding that is consistent with data from studies of English-speaking anomic patients. These data are discussed in terms of current models of spoken word production that have been developed largely on the basis of data from English speakers. We also investigated the relationship between anomia and dyslexia for each patient by presenting 232 items to name from pictorial input and from print. The results showed that there was a highly significant correlation between anomia and dyslexia for the same items among three of the four patients, a finding that is consistent with other studies of Chinese-speaking aphasic patients (e.g. Hu e t al. 1983). However, for one patient there was a complete dissociation between naming and oral reading of the same items (impaired picture naming co-incident with flawless oral reading), suggesting that spoken word production and oral reading can proceed via separate cognitive systems. We offer a model of spoken word production and oral reading in Chinese that assumes picture naming and oral reading rely upon functionally separate pathways to account for these data.

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Section: Anomia and Dyslexiamentioning

confidence: 52%

Anomia and dyslexia in Chinese: A familiar story?

Weekes¹,

Chen²,

Qun³

et al. 1998

Aphasiology

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“…Surface dyslexia has most often been reported in languages with opaque, nonalphabetic scripts such as Chinese (Law & Or, 2001;Weekes & Chen, 1999), and Japanese (Patterson, Suzuki, Wydell, & Sasanuma, 1995), but has also been reported in languages with transparent scripts including Dutch (Diesfeldt, 1992), Italian (Miceli & Caramazza, 1993), and Spanish (Cuetos & Labos, 2001;Iribarren, Jarema, & Lecours, 1999). There also are reports of parallels between the impaired lexical reading of brain damaged patients and developmental reading and writing disorders in Italian (Angelelli, Judica, Spinelli, Zoccolotti, & Luzzatti, 2004) and Spanish (see Weekes, 2005).…”

Section: Models Of Readingmentioning

confidence: 99%

Acquired dyslexia in a turkish-english speaker

Raman

Weekes

2005

Ann. of Dyslexia

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The Turkish script is characterised by completely transparent bidirectional mappings between orthography and phonology. To date, there has been no reported evidence of acquired dyslexia in Turkish speakers leading to the naïve view that reading and writing problems in Turkish are probably rare. We examined the extent to which phonological impairment and orthographic transparency influence reading disorders in a native Turkish speaker. BRB is a bilingual Turkish-English speaker with deep dysphasia accompanied by acquired dyslexia in both languages. The main findings are an effect of imageability on reading in Turkish coincident with surface dyslexia in English and preserved nonword reading. BRB's acquired dyslexia suggests that damage to phonological representations might have a consequence for learning to read in Turkish. We argue that BRB's acquired dyslexia has a common locus in chronic underactivation of phonological representations in Turkish and English. Despite a common locus, reading problems manifest themselves differently according to properties of the script and the type of task.

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“…The first involved word reading. Based on previous studies, it was expected that word reading ability should be more or less intact in AD and represents a highly automatized ability (Cummings et al, 1986;Diesfeldt, 1992;Nebes et al, 1984;Nelson and O'Connell, 1978;O'Carroll and Gilleard, 1986;Schwartz et al, 1980;Sharpe and O'Carroll, 1991). The second task was word comprehension.…”

Section: Introductionmentioning

confidence: 99%

A longitudinal study of semantic memory impairment in patients with Alzheimer’s disease

Mårdh

Nägga

Samuelsson

2013

Cortex

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Introduction The present study explored the nature of the semantic deterioration normally displayed in the course of Alzheimer's disease. The aim was to disentangle the extent to which semantic memory problems in patients with Alzheimer's disease are best characterized as loss of semantic knowledge rather than difficulties in accessing semantic knowledge.Method A longitudinal approach was applied. The same semantic tests as well as same items were used across three test occasions a year apart. Twelve Alzheimer patients and 20 matched control subjects, out of a total of 25 cases in each group, remained at the final test occasion. Results and ConclusionsAlzheimer patients were impaired in all the semantic tasks as compared to the matched comparison group. A progressing deterioration was evident during the study period. Our findings suggest that semantic impairment is mainly due to loss of information rather than problems in accessing semantic information.

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11 Impaired and Preserved Semantic Memory Functions in Dementia

Cited by 39 publications

References 35 publications

Anomia and dyslexia in Chinese: A familiar story?

Anomia and dyslexia in Chinese: A familiar story?

Acquired dyslexia in a turkish-english speaker

A longitudinal study of semantic memory impairment in patients with Alzheimer’s disease

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