Publications by authors named "Katsumi Y"

Introduction: It has long been known that highly arousing emotional single items are better recollected than low arousing neutral items. Despite the robustness of this memory advantage, emotional arousing events may not always promote the retrieval of source details (i.e.

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Background: Posterior Cortical Atrophy (PCA) is a clinical syndrome characterized by progressive visuospatial and visuoperceptual impairment. As the neurodegenerative disease progresses, patients lose independent functioning due to the worsening of initial symptoms and development of symptoms in other cognitive domains. The timeline of clinical progression is variable across patients, and the field currently lacks robust methods for prognostication.

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While advancements have improved the extent to which individual brain imaging approaches capture information regarding spatial or temporal dynamics of brain activity, the connections between these aspects and their relation to psychological functioning remain only partially understood. Acquisition and integration across multiple brain imaging modalities allows for the possible clarification of these connections. The present review provides an overview of three complementary modalities - functional magnetic resonance imaging (fMRI), electroencephalography/event-related potentials (EEG/ERP), and event-related optical signals (EROS) - and discusses progress and considerations for each modality, along with a summary of a novel protocol for acquiring them simultaneously.

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In prospective Japanese studies of pediatric renal tumors, 5-year event-free survival and overall survival (OS) for patients with nephroblastoma ranges from 75-90% and 89-97%, respectively. However, treatments strategies for recurrent nephroblastoma in Japanese patients remain unclear. This retrospective study aimed to inform the development of treatment strategies by analyzing the long-term results and side effects of salvage therapies for recurrent nephroblastoma in Japan.

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Article Synopsis
  • Posterior Cortical Atrophy (PCA) is a syndrome that causes gradual problems with visual processing and spatial awareness, leading to decreased independence as symptoms worsen over time; predicting the disease's progression can be challenging due to individual variability.!* -
  • The study involved recruiting PCA patients from a specialized program and using MRI scans to measure cortical thickness, which was then correlated with clinical assessments of cognitive decline over time, focusing on the CDR Sum-of-Boxes score.!* -
  • Analysis of data from 34 PCA patients revealed significant cortical atrophy in posterior brain regions, especially in areas responsible for visual processing, indicating that baseline cortical atrophy can be a useful predictor of future cognitive decline in PCA patients.!*
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  • Research aims to identify how tau PET imaging correlates with clinical decline in atypical Alzheimer's disease (AD) to improve patient care.
  • Despite known tau accumulation in atypical AD, its predictive value for clinical decline is still uncertain.
  • Findings show tau levels in the default mode network are strong predictors of decline, outperforming other clinical and imaging factors in patients with atypical AD.
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The effects of emotion on memory are wide-ranging and powerful, but they are not uniform. Although there is agreement that emotion enhances memory for individual items, how it influences memory for the associated contextual details (relational memory, RM) remains debated. The prevalent view suggests that emotion impairs RM, but there is also evidence that emotion enhances RM.

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Crystal phase transitions can form a new type of heterojunction with different atomic arrangements in the same material: crystal phase heterojunction (CPHJ). The CPHJ has an inherently strong impact on band engineering without concerns over critical thicknesses with misfit dislocations and a semiconductor-metal transition. In-plane CPHJ was recently demonstrated in two-dimensional (2D) transition-metal dichalcogenide (TMD) materials and utilized for conventional planar field-effect transistor applications.

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In older patients, delirium after surgery is associated with long-term cognitive decline (LTCD). The neural substrates of this association are unclear. Neurodegenerative changes associated with dementia are possible contributors.

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Identifying individuals with early stage Alzheimer's disease (AD) at greater risk of steeper clinical decline would allow professionals and loved ones to make better-informed medical, support, and life planning decisions. Despite accumulating evidence on the clinical prognostic value of tau PET in typical late-onset amnestic AD, its utility in predicting clinical decline in individuals with atypical forms of AD remains unclear. In this study, we examined the relationship between baseline tau PET signal and the rate of subsequent clinical decline in a sample of 48 A/T/N patients with mild cognitive impairment or mild dementia due to AD with atypical clinical phenotypes (Posterior Cortical Atrophy, logopenic variant Primary Progressive Aphasia, and amnestic syndrome with multi-domain impairment and age of onset < 65 years).

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  • Autophagy is usually triggered by stress like starvation or mitochondrial damage, but some cells activate it through unclear ways.
  • Researchers found that the protein C15ORF48 is crucial for activating this stress-independent autophagy, which helps maintain cell survival and reduces oxidative stress.
  • Mice lacking C15orf48 show decreased autophagy in specific cells and develop autoimmune issues, highlighting the importance of C15ORF48 in regulating self-tolerance in the immune system.
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  • Theoretical perspectives in the affective sciences have increased in variety rather than converging due to differing beliefs about the nature and function of human emotions.
  • A teleological principle is proposed to create a unified approach by viewing human affective phenomena as algorithms that adapt to comfort or monitor these adaptations.
  • This framework aims to organize existing theories and inspire new research in the field, leading to a more integrated understanding of human affectivity through the concept of the Human Affectome.
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  • Researchers developed an MRI-based signature to identify brain atrophy linked to sporadic early-onset Alzheimer's disease (EOAD) using two patient samples, one small (n=25) and another larger (n=211).
  • The study found consistent atrophy patterns in specific brain regions, like the caudal lateral temporal cortex and inferior parietal lobule, while the medial temporal lobe was relatively spared.
  • The EOAD-signature atrophy correlates with cognitive impairment severity, suggesting it's a reliable biomarker for Alzheimer’s-related neurodegeneration in clinical trials.
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  • Incisions made on the upper lip during oral and head and neck surgery may lead to sensory disturbances due to injury to the infraorbital nerve (ION) branches, but the exact distribution of these nerve branches in that area has not been well-documented.
  • A study examined nine human cadavers to identify the pattern of ION branches in relation to the muscles of the upper lip, finding that these branches predominantly run vertically rather than horizontally.
  • The study concludes that performing lateral incisions on the upper lip during surgery is safer and minimizes the risk of damaging the ION, particularly recommending avoiding deeper cuts near the labial glands.
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The identification of a neurodegenerative disorder's distributed pattern of atrophy-or atrophy 'signature'-can lend insights into the cortical networks that degenerate in individuals with specific constellations of symptoms. In addition, this signature can be used as a biomarker to support early diagnoses and to potentially reveal pathological changes associated with said disorder. Here, we characterized the cortical atrophy signature of behavioural variant frontotemporal dementia (bvFTD).

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Gradient mapping is an important technique to summarize high dimensional biological features as low dimensional manifold representations in exploring brain structure-function relationships at various levels of the cerebral cortex. While recent studies have characterized the major gradients of functional connectivity in several brain structures using this technique, very few have systematically examined the correspondence of such gradients across structures under a common systems-level framework. Using resting-state functional magnetic resonance imaging, here we show that the organizing principles of the isocortex, and those of the cerebellum and hippocampus in relation to the isocortex, can be described using two common functional gradients.

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Neuroimaging research has been at the forefront of concerns regarding the failure of experimental findings to replicate. In the study of brain-behavior relationships, past failures to find replicable and robust effects have been attributed to methodological shortcomings. Methodological rigor is important, but there are other overlooked possibilities: most published studies share three foundational assumptions, often implicitly, that may be faulty.

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Alzheimer's disease (AD) is characterized neuropathologically by β-amyloid (Aβ) plaques, hyperphosphorylated tau neurofibrillary tangles, and neurodegeneration, which lead to a phenotypically heterogeneous cognitive-behavioral dementia syndrome. Our understanding of how these neuropathological and neurodegeneration biomarkers relate to each other is still evolving. A relatively new approach to measuring structural brain change, gray matter to white matter signal intensity ratio (GWR), quantifies the signal contrast between these tissue compartments, and has emerged as a promising marker of AD-related neurodegeneration.

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Background: COVID-19 vaccination for general population started on April 12, 2021, in Osaka, Japan. We investigated public attitudes toward vaccination and associated factors of vaccine hesitancy during the third state of emergency.

Methods: An internet-based, self-reported, cross-sectional survey was conducted in June 2021, using the smartphone health app for residents of Osaka aged ≥18 years.

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Posterior cortical atrophy (PCA), usually an atypical clinical syndrome of Alzheimer's disease, has well-characterized patterns of cortical atrophy and tau deposition that are distinct from typical amnestic presentations of Alzheimer's disease. However, the mechanisms underlying the cortical spread of tau in PCA remain unclear. Here, in a sample of 17 biomarker-confirmed (A+/T+/N+) individuals with PCA, we sought to identify functional networks with heightened vulnerability to tau pathology by examining the cortical distribution of elevated tau as measured by 18F-flortaucipir (FTP) PET.

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Background And Objectives: Patients with primary progressive aphasia (PPA) have gradually progressive language deficits during the initial phase of the illness. As the underlying neurodegenerative disease progresses, patients with PPA start losing independent functioning due to the development of nonlanguage cognitive or behavioral symptoms. The timeline of this progression from the mild cognitive impairment stage to the dementia stage of PPA is variable across patients.

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This paper integrates emerging evidence from two broad streams of scientific literature into one common framework: (a) hierarchical gradients of functional connectivity that reflect the brain's large-scale structural architecture (e.g., a lamination gradient in the cerebral cortex); and (b) approaches to predictive processing and one of its specific instantiations called (i.

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