Functional dissociation between Kana and Kanji: agraphia following a thalamic hemorrhage

Maeshima, Shinichiro; Osawa, Aiko; Ogura, Joseph H.; Sugiyama, Toshihiro; Kurita, Hiroki; Satoh, Akira; Tanahashi, Norio

doi:10.1007/s10072-011-0753-7

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…In our patient, a SPECT scan revealed decreased blood flow over an expansive area of the left frontal and temporal lobes. Maeshima et al [11] reported a case of thalamic hemorrhage causing agraphia for Kanji and mentioned that a SPECT scan showed decreased blood flow in the left thalamus, left superior temporal gyrus extending to the parietal lobe, and the frontal lobe. Sakurai et al [12] suggested that two separate lesions of the left thalamus could cause agraphia; damage to the ventral lateral nucleus can impair Kana character recall, whereas damage to the dorsomedial nucleus can cause a deficit primarily for Kanji character recall.…”

Section: Discussionmentioning

confidence: 99%

Agraphia Caused by Left Thalamic Hemorrhage

Osawa

Maeshima

Yamane³

et al. 2013

Case Rep Neurol

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A 71-year-old right-handed man was admitted to our hospital with right hemiparesis and sensory impairment associated with mild aphasia. Although aphasia gradually resolved within 2 weeks after stroke onset, his writing ability remained disturbed. A computed tomography (CT) scan at stroke onset revealed a hematoma in the left thalamus, but no cortical lesions were observed. Further, a single-photon emission CT (SPECT) scan showed decreased blood flow in the left thalamus, in the cortical region extending from the left superior temporal gyrus to the parietal lobe, and in the frontal lobe. It is possible that agraphia may have directly resulted from the thalamic lesion, but SPECT findings strongly suggested that a general decrease in left cortical function concomitant with a disruption of the thalamocortical and cortico-thalamocortical projection fibers produced these cognitive deficits.

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Section: Discussionmentioning

confidence: 99%

Agraphia Caused by Left Thalamic Hemorrhage

Osawa

Maeshima

Yamane³

et al. 2013

Case Rep Neurol

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“…The parietal lobe is also implicated in the conversion of phonemes to graphemes (Joseph, 2000;Maeshima et al, 2003). There have also been reports of agraphia following left thalamic lesions (Maeshima et al, 2012). Frontal lobe agraphia is a subtype of agraphia, characterized by difficulty spelling, perseveration, and cursive writing that is generally poorer than printed writing (Joseph, 2000).…”

Section: Introductionmentioning

confidence: 99%

The Right to Write: EEG Neurofeedback Training in Frontal Lobe Agraphia—A Case Report

Bennett

Rajeswaran

Somanna

et al. 2013

Journal of Neurotherapy

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Frontal lobe agraphia is a rare condition. Rehabilitation for frontal lobe agraphia is not well documented. The primary objective of this study was to examine the effectiveness of an electroencephalogram neurofeedback training (NFT) intervention in improving cognitive functions and resolving frontal lobe agraphia following a traumatic brain injury. A single-case research design was used. Cognitive deficits and symptom severity were recorded at baseline. Alpha-theta enhancement training was conducted at the O1 and O2 scalp locations. Postintervention assessment indicated improvement in several areas of cognitive functioning and resolution of frontal lobe agraphia. Results indicate that NFT holds promise as a neuropsychological rehabilitation technique in resolving cognitive deficits and frontal lobe agraphia.

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Aphasia and unilateral spatial neglect due to acute thalamic hemorrhage: clinical correlations and outcomes

Osawa

Maeshima

2016

Neurol Sci

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Thalamic hemorrhages are associated with a variety of cognitive dysfunctions, and it is well known that such cognitive changes constitute a limiting factor of recovery of the activities of daily living (ADL). The relationship between cognitive dysfunction and hematomas is unclear. In this study, we investigated the relationship between aphasia/neglect and hematoma volume, hematoma type, and the ADL. One hundred fifteen patients with thalamic hemorrhage (70 men and 45 women) were studied. Their mean age was 68.9 ± 10.3 years, and patients with both left and right lesions were included. We calculated hematoma volume and examined the presence or absence of aphasia/neglect and the relationships between these dysfunctions and hematoma volume, hematoma type, and the ADL. Fifty-nine patients were found to have aphasia and 35 were found to have neglect. Although there was no relationship between hematoma type and cognitive dysfunction, hematoma volume showed a correlation with the severity of cognitive dysfunction. The ADL score and ratio of patient discharge for patients with aphasia/neglect were lower than those for patients without aphasia/neglect. We observed a correlation between the hematoma volume in thalamic hemorrhage and cognitive dysfunction. Aphasia/neglect is found frequently in patients with acute thalamic hemorrhage and may influence the ADL.

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Functional dissociation between Kana and Kanji: agraphia following a thalamic hemorrhage

Cited by 9 publications

References 15 publications

Agraphia Caused by Left Thalamic Hemorrhage

Agraphia Caused by Left Thalamic Hemorrhage

The Right to Write: EEG Neurofeedback Training in Frontal Lobe Agraphia—A Case Report

Aphasia and unilateral spatial neglect due to acute thalamic hemorrhage: clinical correlations and outcomes

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