Anomic Alexia of Kanji in a Patient with Anomic Aphasia

Yamawaki, Rie; Suzuki, Kyoko; Tanji, Kazuyo; Fujii, Toshikatsu; Endo, Keiko; Meguro, Kenichi; Yamadori, Atsushi

doi:10.1016/s0010-9452(08)70195-3

Cited by 12 publications

(4 citation statements)

References 14 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). A similar finding reported that electrical stimulation of the left basal temporal area selectively disrupted kanji reading and object naming but not kana reading (Usui et al, 2003).…”

Section: Picture-naming Tasksupporting

confidence: 87%

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: 87%

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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“…The Japanese language has both a logographic script (kanji) that should require indexed phonology and a syllabic script (kana) that can be sounded out. A double dissociation has been found in that lesions of the temporal lobe which include the pITG impair reading of kanji whereas parietal lesions centered on the angular gyrus impair reading of kana (Iwata, 1984; Sakurai et al, 1994; Sakurai, 2004; Yamadori, 2000; Yamawaki et al, 2005), although for a dissenting view see Sugishita, Otomo, Kabe, and Yunoki (1992).…”

Section: General Introductionmentioning

confidence: 99%

Combined ERP/fMRI evidence for early word recognition effects in the posterior inferior temporal gyrus

Dien

Brian

Molfese

et al. 2013

Cortex

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Two brain regions with established roles in reading are the posterior middle temporal gyrus and the posterior fusiform gyrus. Lesion studies have also suggested that the region located between them, the posterior inferior temporal gyrus (pITG), plays a central role in word recognition. However, these lesion results could reflect disconnection effects since neuroimaging studies have not reported consistent lexicality effects in pITG. Here we tested whether these reported pITG lesion effects are due to disconnection effects or not using parallel ERP/fMRI studies. We predicted that the Recognition Potential (RP), a left-lateralized ERP negativity that peaks at about 200–250 ms, might be the electrophysiological correlate of pITG activity and that conditions that evoke the RP (perceptual degradation) might therefore also evoke pITG activity. In Experiment 1, twenty-three participants performed a lexical decision task (temporally flanked by supraliminal masks) while having high-density 129-channel ERP data collected. In Experiment 2, a separate group of fifteen participants underwent the same task while having fMRI data collected in a 3T scanner. Examination of the ERP data suggested that a canonical Recognition Potential effect was produced. The strongest corresponding effect in the fMRI data was in the vicinity of the pITG. In addition, results indicated stimulus-dependent functional connectivity between pITG and a region of the posterior fusiform gyrus near the visual word form area (VWFA) during word compared to nonword processing. These results provide convergent spatiotemporal evidence that the pITG contributes to early lexical access through interaction with the VWFA.

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“…Of the neural tracts characterized in this study, the dorsal OCF was the only one that sustained damage. Interestingly, anomic alexia of kanji can develop after damage to the middle part of the left middle temporal gyrus and its subcortical area, suggesting that some common mechanism may underlie both kanji naming and kanji reading 9 . Similarly, anomic alexia of kana may be related to damage to the IPL and its subcortical area.…”

Section: Discussionmentioning

confidence: 99%

Damage of White Matter in the Parietal Lobe Results in Anomic Alexia of Kana

Shinoura

Suzuki

Tsukada

et al. 2010

Can. j. neurol. sci.

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The reading and writing of two different types of Japanese words, "kana" and "kanji", are processed by different neural pathways. For example, kana are phonographic representations of words that are processed though the dorsal route related to phonological processing in a manner similar to that for words of phonetic languages (e.g., English). Investigators have reported that the left angular gyrus is critical for the process of writing kana 1,2 . By contrast, kanji are logographic representations of words and are processed through the ventral route related to visual processing in a manner similar to that for logographic languages (e.g., Chinese) [3][4][5] . Investigators have reported that the left posterior inferior or middle temporal cortex is critical for the process of reading or writing kanji 2,[6][7][8] . THE CANADIAN JOURNAL OF NEUROLOGICAL SCIENCES 113 BRIEF COMMUNICATIONSPatients with alexia and anomic aphasia, namely anomic alexia for kanji, present with lesions that correspond to the middle temporal gyrus and its subcortical area 9 . Conversely, alexia and anomic aphasia for English are induced by lesions of the left occipital and medial temporal lobe 10 . To date, there are no reports that characterize lesions responsible for anomic alexia for kana and the relationship between reading of kana and neural tracts remain unclear.Newer, noninvasive diagnostic modalities have enabled characterization of the neuroanatomic distribution of various language functions within the human brain. Of these new diagnostic modalities, diffuse tensor imaging (DTI) provides information regarding the trajectories of cerebral white matter Fig. 1A and Fig. 1B quantitatively,

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Anomic Alexia of Kanji in a Patient with Anomic Aphasia

Cited by 12 publications

References 14 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

Combined ERP/fMRI evidence for early word recognition effects in the posterior inferior temporal gyrus

Damage of White Matter in the Parietal Lobe Results in Anomic Alexia of Kana

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