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Biomedical subjects

Yuu Kaneko

Publications and source records attributed to Yuu Kaneko.

6 recordsLinked to original sources
PubMed2005

Complex behavioral automatism arising from insular cortex.

We describe two cases of complex partial seizures with ictal violent movements arising from the insular cortex. The first patient, a 14-year-old girl, presented with hyperkinetic behavior such as rolling, thrashing, and pedaling, and the second case, a 38-year-old woman, had been suffering from frequent daytime hyperkinetic seizures characterized by bizarre vocalization, jumping, and violent bimanual movements. Both patients showed a slight high signal change in the right posterior ventral insular cortex in fluid-attenuated inversion recovery (FLAIR) studies involving magnetic resonance imaging, and extensive subdural electroencephalographic monitoring revealed EEG seizure onset from the temporal lobe. The posterior ventral insular and lateral temporal cortices were resected, resulting in complete seizure freedom in both cases. The histological diagnoses were focal cortical dysplasia in the first case and gliosis in the second case. There may exist a group of patients with complex partial seizures with ictal violent automatism that can be ameliorated by the resection of epileptogenic lesions in the insular cortex. Careful inspection of the insular cortex is necessary to diagnose this type of epileptic seizure.

Adolescent↗
PubMed2005

Auditory imagery mismatch negativity elicited in musicians.

A mismatch between auditory sensation and expectant imagery of syllables elicited a possible equivalent of mismatch negativity in a previous study. The purpose of this study was to verify whether auditory imagery from musical notation could also mediate such imagery-based mismatch negativity. Neuromagnetic recording was obtained from eight musicians, who were instructed to identify unpredictably occurring pitch mismatches between a random tone sequence and a visually presented musical score. The difference between incongruent and congruent responses showed a magnetic distribution consistent with two frontal-negative current dipoles bilaterally located in the vicinity of Heschl's gyrus, peaking at approximately 150 ms in latency. This imagery-based mismatch negativity may represent an early neural process of deviance detection between the sensory input and expectant imagery.

Acoustic Stimulation↗
PubMed2005

Audiovisual phonological mismatch produces early negativity in auditory cortex.

During silent reading, visual information provided by letters is converted to auditory information in the mind. The purpose of this study was to identify the primary locus for auditory verbal imagery in the brain. Neuromagnetic recording was obtained from 10 right-handed study participants, who were instructed to identify infrequently occurring phonological mismatches between a random-ordered sequence of syllable sounds and a visually presented syllabogram sequence. The activity difference in early latency, calculated by subtracting the averaged responses to matched syllables from the averaged responses to mismatched syllables, showed a spatiotemporal profile strikingly similar to that of mismatch negativity. Auditory imagery of forthcoming verbal sounds may establish a memory trace as a template for imagery-based mismatch negativity generation in the auditory cortex.

Acoustic Stimulation↗
PubMed2002

Visual activation positron emission tomography for presurgical evaluation of occipital lobe epilepsy--case report.

A 14-year-old boy suffered from daily epileptic seizures originating from the left polymicrogyric occipital cortex. Visual activation positron emission tomography (PET) was used to map the function of the occipital cortex presurgically. Loss of visual function in the left occipital cortex was suggested by both visual activation PET and electrical cortical stimulation. Left occipital lobectomy resulted in a completely seizure-free status without deterioration in the visual function. Preoperative evaluation of the visual function in the epileptogenic occipital cortex by activation studies using PET or functional magnetic resonance imaging is the key to the successful surgical treatment of occipital lobe epilepsy.

Adolescent↗