title: Toward a functional neuroanatomy of semantic aphasia: A history and ten new cases.
abstract: Almost 70 years ago, Alexander Luria incorporated semantic aphasia among his aphasia classifications by demonstrating that deficits in linking the logical relationships of words in a sentence could co-occur with non-linguistic disorders of calculation, spatial gnosis and praxis deficits. In line with his comprehensive approach to the assessment of language and other cognitive functions, he argued that deficits in understanding semantically reversible sentences and prepositional phrases, for example, were in line with a single neuropsychological factor of impaired spatial analysis and synthesis, since understanding such grammatical relationships would also draw on their spatial relationships. Critically, Luria demonstrated the neural underpinnings of this syndrome with the critical implication of the cortex of the left temporal-parietal-occipital (TPO) junction. In this study, we report neuropsychological and lesion profiles of 10 new cases of semantic aphasia. Modern neuroimaging techniques provide support for the relevance of the left TPO area for semantic aphasia, but also extend Luria's neuroanatomical model by taking into account white matter pathways. Our findings suggest that tracts with parietal connectivity - the arcuate fasciculus (long and posterior segments), the inferior fronto-occipital fasciculus, the inferior longitudinal fasciculus, the superior longitudinal fasciculus II and III, and the corpus callosum - are implicated in the linguistic and non-linguistic deficits of patients with semantic aphasia.
authors.affiliation: National Research University Higher School of Economics, Russian Federation; Moscow Research Institute of Psychiatry, Moscow, Russian Federation. Electronic address: odragoy@hse.ru.
authors.forename: Olga
authors.initials: O
authors.lastname: Dragoy
authors.affiliation: National Research University Higher School of Economics, Russian Federation; Graduate School for the Humanities, University of Groningen, Groningen, The Netherlands.
authors.forename: Yulia
authors.initials: Y
authors.lastname: Akinina
authors.affiliation: National Research University Higher School of Economics, Russian Federation; VA Northern California Health Care System, University of California, Davis, CA, USA.
authors.forename: Nina
authors.initials: N
authors.lastname: Dronkers
mesh_terms: D000328:Adult; D000368:Aged; D001037:Aphasia / Q000000981:diagnostic imaging / Q000473:pathology*; D001921:Brain / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000000981:diagnostic imaging / Q000473:pathology*; D059906:Neuroimaging; D009483:Neuropsychological Tests; D013037:Spatial Behavior / Q000502:physiology; D066127:White Matter / Q000000981:diagnostic imaging / Q000473:pathology*
keywords: Alexander Luria; Semantic aphasia; Temporal-parietal-occipital junction; White matter tracts