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  Semantic interference through multiple distractors in picture naming in people with aphasia

van Scherpenberg, C., Rahman, R. A., Regenbrecht, F., & Obrig, H. (2021). Semantic interference through multiple distractors in picture naming in people with aphasia. Journal of Cognitive Neuroscience, 33(8), 1612-1633. doi:10.1162/jocn_a_01731.

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 Creators:
van Scherpenberg, Cornelia1, 2, 3, Author           
Rahman, Rasha Abdel1, Author
Regenbrecht, Frank3, Author
Obrig, Hellmuth1, 2, 3, Author           
Affiliations:
1Humboldt University Berlin, Germany, ou_persistent22              
2Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
3University Hospital Leipzig, Germany, ou_persistent22              

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 Abstract: When we refer to an object or concept by its name, activation of semantic and categorical information is necessary to retrieve the correct lexical representation. Whereas in neurotypical individuals it is well established that semantic context can interfere with or facilitate lexical retrieval, these effects are much less studied in people with lesions to the language network and impairment at different steps of lexical-semantic processing. Here, we applied a novel picture naming paradigm, where multiple categorically related and unrelated words were presented as distractors before a to-be-named target picture. Using eye tracking, we investigated preferential fixation on the cohort members versus nonmembers. Thereby, we can judge the impact of explicit acknowledgment of the category and its effect on semantic interference. We found that, in contrast to neurotypical participants [van Scherpenberg, C., Abdel Rahman, R., & Obrig, H. A novel multiword paradigm for investigating semantic context effects in language production. PLoS One, 15, e0230439, 2020], participants suffering from mild to moderate aphasia did not show a fixation preference on category members but still showed a large interference effect of ∼35 msec, confirming the implicit mechanism of categorical interference. However, preferential fixation on the categorically related cohort words correlated with clinical tests regarding nonverbal semantic abilities and integrity of the anterior temporal lobe. This highlights the role of supramodal semantics for explicit recognition of a semantic category, while semantic interference is triggered if the threshold of lexical cohort activation is reached. Confirming psycholinguistic evidence, the demonstration of a large and persistent interference effect through implicit lexico-semantic activation is important to understand deficits in people with a lesion in thelanguage network, potentially relevant for individualized intervention aiming at improving naming skills.

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Language(s): eng - English
 Dates: 2021-07-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1162/jocn_a_01731
PMID: 34496369
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Title: Journal of Cognitive Neuroscience
Source Genre: Journal
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Publ. Info: Cambridge, MA : MIT Press Journals
Pages: - Volume / Issue: 33 (8) Sequence Number: - Start / End Page: 1612 - 1633 Identifier: ISSN: 0898-929X
CoNE: https://pure.mpg.de/cone/journals/resource/991042752752726