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Identification of taxonomic and thematic relationships: Do the two semantic systems have the same status in semantic dementia?

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Title: Identification of taxonomic and thematic relationships: Do the two semantic systems have the same status in semantic dementia?
Authors: Merck, Catherine (AUTHOR), Noël, Audrey (AUTHOR), Jamet, Eric (AUTHOR), Robert, Maxime (AUTHOR), Hou, Camille (AUTHOR), Salmon, Anne (AUTHOR), Belliard, Serge (AUTHOR), Kalénine, Solène (AUTHOR)
Source: Journal of Clinical & Experimental Neuropsychology. Nov2019, Vol. 41 Issue 9, p946-964. 19p. 1 Diagram, 3 Charts, 2 Graphs.
Subjects: Dementia, Cladistic analysis, Alzheimer's disease, Statistical correlation, Semantic memory
Abstract: Introduction: Disequilibrium between the taxonomic and thematic semantic systems was previously hypothesized in participants with semantic dementia (SD), without rigorously assessing their ability to identify the two types of semantic relationships. Therefore, the aim of the present study was to directly compare the ability of 10 participants with SD, 10 participants with Alzheimer's disease (AD), and 20 controls to identify thematic versus taxonomic relationships. Methods: Participants performed an explicit forced-choice picture-matching task in which they had to determine which of two pictures of choice was semantically related to the target picture. Target pictures could display natural or artifact objects. Each target was presented once with a taxonomically related picture and once with a thematically related picture. Results: Analyses of correct thematic and taxonomic matches as a function of target domain showed that the performance of the two groups of patients differed in the taxonomic conditions but not in the thematic conditions, demonstrating a relative preservation of thematic knowledge in SD. Additional correlation analyses further indicated that the particular status of thematic relationships in SD was even stronger for artifact concepts. Conclusions: Results provide evidence of the heterogeneous nature of semantic knowledge disruption in SD, and could be regarded as being consistent with the existence of two neuroanatomically and functionally distinct semantic systems. Results further stress the relevance of performing a more detailed and complete assessment of semantic performance in participants with SD, in order to capture the impaired but also preserved aspects of their knowledge. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Clinical & Experimental Neuropsychology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Label: Title
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  Data: Identification of taxonomic and thematic relationships: Do the two semantic systems have the same status in semantic dementia?
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  Data: <searchLink fieldCode="AR" term="%22Merck%2C+Catherine%22">Merck, Catherine</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Noël%2C+Audrey%22">Noël, Audrey</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jamet%2C+Eric%22">Jamet, Eric</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Robert%2C+Maxime%22">Robert, Maxime</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hou%2C+Camille%22">Hou, Camille</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Salmon%2C+Anne%22">Salmon, Anne</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Belliard%2C+Serge%22">Belliard, Serge</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kalénine%2C+Solène%22">Kalénine, Solène</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Clinical+%26+Experimental+Neuropsychology%22">Journal of Clinical & Experimental Neuropsychology</searchLink>. Nov2019, Vol. 41 Issue 9, p946-964. 19p. 1 Diagram, 3 Charts, 2 Graphs.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Dementia%22">Dementia</searchLink><br /><searchLink fieldCode="DE" term="%22Cladistic+analysis%22">Cladistic analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Alzheimer's+disease%22">Alzheimer's disease</searchLink><br /><searchLink fieldCode="DE" term="%22Statistical+correlation%22">Statistical correlation</searchLink><br /><searchLink fieldCode="DE" term="%22Semantic+memory%22">Semantic memory</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Introduction: Disequilibrium between the taxonomic and thematic semantic systems was previously hypothesized in participants with semantic dementia (SD), without rigorously assessing their ability to identify the two types of semantic relationships. Therefore, the aim of the present study was to directly compare the ability of 10 participants with SD, 10 participants with Alzheimer's disease (AD), and 20 controls to identify thematic versus taxonomic relationships. Methods: Participants performed an explicit forced-choice picture-matching task in which they had to determine which of two pictures of choice was semantically related to the target picture. Target pictures could display natural or artifact objects. Each target was presented once with a taxonomically related picture and once with a thematically related picture. Results: Analyses of correct thematic and taxonomic matches as a function of target domain showed that the performance of the two groups of patients differed in the taxonomic conditions but not in the thematic conditions, demonstrating a relative preservation of thematic knowledge in SD. Additional correlation analyses further indicated that the particular status of thematic relationships in SD was even stronger for artifact concepts. Conclusions: Results provide evidence of the heterogeneous nature of semantic knowledge disruption in SD, and could be regarded as being consistent with the existence of two neuroanatomically and functionally distinct semantic systems. Results further stress the relevance of performing a more detailed and complete assessment of semantic performance in participants with SD, in order to capture the impaired but also preserved aspects of their knowledge. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Clinical & Experimental Neuropsychology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: Nov2019
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