Cited by 16Dementia and Cognitive Impairment ResearchNeurobiology of Language and BilingualismAmyotrophic Lateral Sclerosis Research

Verbal semantics and the left dorsolateral anterior temporal lobe: a longitudinal case of bilateral temporal degeneration

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Vonk, Jet M. J., Borghesani, Valentina, Battistella, Giovanni, Younes, Kyan, DeLeon, Jessica, Welch, Ariane, Hubbard, H. Isabel, Miller, Zachary A. +2 more·2020·Aphasiology

Abstract

BACKGROUND: Semantic variant primary progressive aphasia (svPPA), a clinical syndrome characterized by loss of semantic knowledge, is associated with neurodegeneration that starts in the anterior temporal lobe (ATL) and gradually spreads towards posterior temporal and medial frontal areas. At the earliest stages, atrophy may be predominantly lateralized to either the left or right ATL, leading to different clinical profiles with greatest impairment of word comprehension or visual/social semantics, respectively. METHODS & PROCEDURES: We report the in-depth longitudinal investigation of cognitive and neuroanatomical features of JB, an unusual case of ATL neurodegeneration with relative sparing of left lateral ATL regions. OUTCOMES & RESULTS: Over the course of nine years, neurodegeneration progressed to involve bilateral temporo-lateral and frontal regions, resulting in a relatively symmetric and diffuse frontotemporal atrophy pattern. In parallel, JB developed greater behavioral, cognitive, and language impairments, as well as signs of motor neuron disease at her last evaluation. Episodic memory and socio-emotional processing deficits arose, likely secondary to semantic verbal deficits, while visuospatial processing, executive function, and non-semantic language abilities remained largely unaffected throughout the course of the disease. CONCLUSIONS: The details of this rare case of early medial more than lateral ATL degeneration are consistent with a bilateral organization of the semantic system and, crucially, with a functional dissociation between medial paralimbic and lateral neocortical temporal regions. Cases of frontotemporal dementia (FTD) such as JB, who initially do not meet current clinical criteria for svPPA and instead present with some features of behavioral variant FTD, highlight the need for specific criteria for the right temporal variant of FTD that we propose could be called semantic variant FTD.

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Crossref · 10.1080/02687038.2019.1659935

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  • The bilateral ATLs have been linked extensively to their role in semantic processing; the lATL has been largely associated with verbal semantics, whereas the rATL has been largely associated with nonverbal semantics, particularly regarding visual and socioemotional knowledge.

    “The bilateral ATLs have been linked extensively to their role in semantic processing42; the lATL has been largely associated with verbal semantics, whereas the rATL has been largely associated with nonverbal semantics, particularly regarding visual and socioemotional knowledge.8,43”

    From Automated Speech Analysis to Differentiate Frontal and Right Anterior Temporal Lobe Atrophy in Frontotemporal Dementia (2025) · cites this paper as [8]

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  • sbvFTD is characterized by rATL atrophy and nonverbal semantic loss related to socioemotional concepts.

    “new criteria have been proposed for a syndrome named semantic behavioral-variant FTD (sbvFTD), characterized by rATL atrophy and nonverbal semantic loss related to socioemotional concepts.3,7-9”

    From Automated Speech Analysis to Differentiate Frontal and Right Anterior Temporal Lobe Atrophy in Frontotemporal Dementia (2025) · cites this paper as [8]

    The Discussion describes right-predominant anterior temporal atrophy alongside nonverbal and social-semantic impairment, including changes in emotion processing. It proposes the name “semantic variant FTD” and calls for specific diagnostic criteria; it does not propose criteria for a syndrome named “semantic behavioral-variant FTD” (sbvFTD). (LLM, conf=0.85)

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Research works printed but not linked: 2

  1. Delis DC, Kramer JH, Kaplan E, & Ober BA (2000). California Verbal Learning Test - Second Edition. The Psychological Corporation: San Antonio, TX
  2. Yeo BT, Krienen FM, Sepulcre J, Sabuncu MR, Lashkari D, Hollinshead M, … Buckner RL. (2011). The organization of the human cerebral cortex estimated by intrinsic functional connectivity. Journal of Neurophysiology, 106(3), 1125– 1165. doi: 10.1152/jn.00338.2011 21653723 PMC3174820 · DOI · Paper page

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Authors
Vonk, J. M. J., Borghesani, V., Battistella, G., Younes, K., DeLeon, J., Welch, A., Hubbard, H. I., Miller, Z. A., Miller, B. L., & Gorno-Tempini, M. L.
Affiliations
  • University of California, San Francisco (US)
  • University of Kentucky (US)
  • Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA, USA
Corresponding author
Vonk, Jet M. J.
Venue
Aphasiology
Published
2019-09-04
Volume
34
Issue
7
Pages
865-885
ISSN
  • 0268-7038 (ISSN-L)
  • 1464-5041
OpenAlex
W2971370546
Cited by
16
References
76
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2022: 5 · 2021: 4 · 2020: 3
FWCI
2.39
Type
journal article
Language
en
Open access
Locations
  • Aphasiology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
Funders
  • National Institute of Neurological Disorders and Stroke (R01 NS050915)
  • National Institute on Aging (P50 AG023501)
  • National Institute on Deafness and Other Communication Disorders (K24 DC015544)
  • Alzheimer Nederland (NA)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
Keywords
semantic dementia, frontotemporal atrophy, episodic memory impairment, behavioral variant frontotemporal dementia, longitudinal case study

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