Alexia caused by a fusiform or posterior inferior temporal lesion

Sakurai, Yasuhisa; Takeuchi, Shuji; Takada, Toshihiro; Horiuchi, Emiko; Nakase, Hirofumi; Sakuta, Manabu

doi:10.1016/s0022-510x(00)00363-4

Cited by 64 publications

(75 citation statements)

References 26 publications

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“…This is consistent with the finding that patients with kanji alexia also frequently have naming disorders (Sakurai et al, 2000). In patients with large temporal lesions, comprehension of kanji and the ability to read them sometimes dissociate (Yamawaki et al, 2005).…”

Section: Picture-naming Tasksupporting

confidence: 90%

High-Frequency γ-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks

Suzuki²,

et al. 2005

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␥-Band activity (GBA) in electroencephalograms (EEGs) has been shown to reflect various cognitive processes. GBA has typically been recorded in the 30 -60 Hz range in scalp EEGs. Recently, task-related "high GBA" (HGBA) with frequencies up to 100 Hz has been observed in studies with invasive electrocorticograms (ECoGs). In the present study, we recorded ECoGs from the bilateral basal temporal cortices in a patient with epilepsy and evaluated the task-related HGBA (most prominently in the 80 -120 Hz range) accompanying picture-naming and lexical-decision tasks. We examined picture naming using two categories (line drawings of animals and tools). The lexical-decision task was performed using words and pseudowords of two distinct Japanese writing forms, kanji (morphograms) and kana (syllabograms). Task-related HGBA was observed bilaterally during the naming task. Recordings from some electrodes revealed significant differences in HGBA between animal and tool pictures. In contrast to the naming task, there was apparent left dominance in the lexical-decision task. Furthermore, significant differences in HGBA were observed between the Japanese kanji and kana words and between the kanji words and kanji pseudowords. A number of differences in the HGBA observed in the recordings from the basal temporal area were consistent with previous findings from neuroimaging and patient studies and suggest that HGBA is a good correlate of visual cognitive functions.

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Section: Picture-naming Tasksupporting

confidence: 90%

High-Frequency γ-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks

Suzuki²,

et al. 2005

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“…Interestingly, angular alexia with agraphia may be the result of damage to the adjacent lateral occipital gyri. 23) In the present case, the lesion was located in the posterolateral part of the angular gyrus and extended toward the lateral occipital gyri.…”

Section: Discussionsupporting

confidence: 42%

Safe Removal of Glioblastoma Near the Angular Gyrus by Awake Surgery Preserving Calculation Ability-Case Report-

Kurimoto

Asahi

Shibata

et al. 2006

Neurol. Med. Chir.(Tokyo)

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A 67-year-old patient presented with progressive agraphia, alexia, and impaired ability to calculate persisting for 4 weeks. He showed preserved ability to do single-digit addition and subtraction. Magnetic resonance imaging demonstrated a tumor in the left parietal lobe. A malignant glioma was suspected, and awake craniotomy was performed to remove the tumor with functional cortical mapping to determine the cortices involved in calculation and language. His calculation ability was mapped on the angular gyrus, and partial resection of the tumor was achieved without deterioration of that ability. The histological diagnosis was glioblastoma multiforme. The patient's calculation ability improved dramatically after the operation.

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“…Many studies of phonogram and ideogram originated from Japanese in which dual orthographic system is employed; Kana (phonograms) and Kanji (ideograms) (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Japanese authors have found a double dissociation between Kana and Kanji impairments in brain-damaged patients and reported that Kanji is processed mainly in left posterior inferior temporal area (4)(5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Hanja Alexia with Agraphia After Left Posterior Inferior Temporal Lobe Infarction: A Case Study

et al. 2002

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INTRODUCTIONVery few countries in the world use languages that can be written in both ideogram, a graphic record of a meaning, and phonogram, a graphic record of a sound. Reading or writing impairment of these two written systems after brain damage may provide information about whether or not phonogram and ideogram are mediated in different brain regions.Many studies of phonogram and ideogram originated from Japanese in which dual orthographic system is employed; Kana (phonograms) and Kanji (ideograms) (1-12). Japanese authors have found a double dissociation between Kana and Kanji impairments in brain-damaged patients and reported that Kanji is processed mainly in left posterior inferior temporal area (4-9). On the contrary, there have been few studies on Korean written language (13,14), another orthographic system that also uses both phonogram (Hangul) and Chinese ideogram (Hanja). We report a man with alexia and agraphia for Hanja but intact reading and writing for Hangul after a left posterior inferior temporal lobe infarction. Interestingly, the patient was an expert in Hanja as he had been a calligrapher over 40 years. MATERIALS AND METHODS Case ReportA 64-yr-old right-handed man was admitted to our department because of a blurred vision and paresthesia on the right extremities. Three days before admission, on waking up, he felt narrowed right visual field with dizziness and headache in addition to paresthesia and clumsiness in the right extremities. On the next morning, he noticed a weakness on his right arm and could not remember the names of his close friends.His past medical history revealed a gout 13 yr before, a pneumonia 10 yr before, and hypertension for several years for which he had been on antihypertensive drugs intermittently. The history of diabetes mellitus or episodes of stroke was denied. He was a social drinker and non-smoker. He was educated for 12 yr and learned Hanja since childhood. He had been a Hanja calligrapher over 40 yr and he once received an award in a famous national calligraphy contest.On physical examination, blood pressure was 150/100 mmHg but heart beat was regular. He was fully conscious and oriented to time, place, and person. He scored 27/30 on

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Alexia caused by a fusiform or posterior inferior temporal lesion

Cited by 64 publications

References 26 publications

High-Frequency γ-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks

High-Frequency γ-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks

Safe Removal of Glioblastoma Near the Angular Gyrus by Awake Surgery Preserving Calculation Ability-Case Report-

Hanja Alexia with Agraphia After Left Posterior Inferior Temporal Lobe Infarction: A Case Study

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