A clinico-anatomical correlation study of Broca's area aphasias on magnetic resonance imaging.

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  • Ｂｒｏｃａ野を含む限局性病変の言語症状：　ＭＲＩによる病変部位と症状との対応

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    We evaluated 7 right-handed aphasic patients with single infarctions including Broca's area (pars opercularis and/or pars triangularis of the left inferior frontal gyrus) in order to define the relationship of speech and language symptoms to specific localizations of small lesions. Magnetic resonance imagings (MRIs) were scored by anatomical checklists. Performances on the Japanese version of the Western Aphasia Battery (WAB) were used to rate articulation, prosody, phrase length, initiation of speech, grammatical form, syntactic comprehension, and paraphasias.<br>    The results were as follows: (1) All patients had a lesion including the pars opercularis of the left inferior frontal gyrus, and all demonstrated short phrase lengths and simplified grammatical forms in their spontaneous speech; (2) Patients with a lesion in the posterior part of the left middle frontal gyrus exhibited delayed initiation of speech and decreased amount of utterance ; (3) Patients with a lesion in the lower part of the left precentral gyrus showed distortion of speech, while patients with a lesion extending to the posterior part of the precentral gyrus showed severe and persisting speech disorder; (4) Phonemic paraphasias were found in patients with a deep white-matter lesion or precentral lesion, while semantic paraphasias were not correlated to any particular lesion; (5) Aphasic patients with a lesion restricted in or near Broca's area were classified as either “fluent” or “nonfluent” on the WAB. These results suggested that: (1) The pars opercularis of the left inferior frontal gyrus is related to syntactic aspects of language ; (2) The posterior part of the middle frontal gyrus is related to speech and language initiation ; and (3) The lower part of the left precentral gyrus is related to articulation.

Journal

  • Higher Brain Function Research

    Higher Brain Function Research 16 (3), 276-283, 1996

    Japanese Society of Aphasiology (Renamed as Japan Society for Higher Brain Function)

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