Publications by authors named "Yuya Hirayama"

Article Synopsis
  • - This study explored how focal brain cooling (FBC) impacts spreading depolarization (SD), a phenomenon linked to various neurological issues, finding potential for FBC to reduce SD effects and promote recovery.
  • - Researchers created an experimental model using rats and potassium chloride (KCl) to study SD, comparing effects between a cooling group (CL) maintaining lower brain temperature and a non-cooling group (NC).
  • - Results indicated that FBC not only increased the duration of KCl-induced depolarization events but also decreased their frequency and lowered endothelial nitric oxide synthase (eNOS) expression, suggesting FBC could aid in creating new treatments for SD and related conditions.
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Population preferences for video advertisements vary across short video clips. What underlies these differences? Repeatedly watching a video clip may produce a consistent spatiotemporal pattern of neural activity that is dependent on the individual and the stimulus. Moreover, such consistency may be associated with the degree of engagement and memory of individual viewers.

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Article Synopsis
  • * Cooling the right sensorimotor cortex for 10 minutes following generalized motor seizure induction showed significant reductions in spikes, with a decrease to 71.2% and 62.5% at 15°C and 5°C, respectively.
  • * While local cooling provides some seizure relief, it was less effective for generalized motor seizures compared to cooling at the site of the epileptic focus.
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Objective: Traditionally, angiographic vasospasm (aVS) has been thought to cause delayed cerebral ischemia (DCI) after aneurysmal subarachnoid hemorrhage (aSAH). However, successful treatment of aVS alone does not result in improved neurological outcome. Therefore, there may be other potential causes of poor neurological outcome, including spreading depolarization (SD).

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This study aimed to understand the mechanism by which brain cooling terminates epileptic discharge. Cortical slices were prepared from rat brains (n = 19) and samples from patients with intractable epilepsy that had undergone temporal lobectomy (n = 7). We performed whole cell current clamp recordings at approximately physiological brain temperature (35℃) and at cooler temperatures (25℃ and 15℃).

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Objective: Brain hypothermia controls epileptic discharge and reduces extracellular concentrations of glutamate (Glu), an excitatory neurotransmitter. We aimed to determine the effects of focal brain cooling (FBC) on levels of γ-aminobutyric acid (GABA), which is a major inhibitory neurotransmitter. The relationship between Glu or GABA concentrations and the severity of epileptic symptoms was also analyzed.

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Graph data are becoming increasingly common in machine learning and data mining, and its application field pervades to bioinformatics and cheminformatics. Accordingly, as a method to extract patterns from graph data, graph mining recently has been studied and developed rapidly. Since the number of patterns in graph data is huge, a central issue is how to efficiently collect informative patterns suitable for subsequent tasks such as classification or regression.

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