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Convolutional Neural Networks for the segmentation of hippocampal structures in postmortem MRI scans.
J Neurosci Methods
January 2025
Neuroimage Analytics Laboratory and Biggs Institute Neuroimaging Core, Glenn Biggs Institute for Neurodegenerative Disorders, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA; Research Imaging Institute, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA. Electronic address:
Background: The hippocampus plays a crucial role in memory and is one of the first structures affected by Alzheimer's disease. Postmortem MRI offers a way to quantify the alterations by measuring the atrophy of the inner structures of the hippocampus. Unfortunately, the manual segmentation of hippocampal subregions required to carry out these measures is very time-consuming.
View Article and Find Full Text PDFVery-light-intensity exercise as minimal intensity threshold for activating dorsal hippocampal neurons: Evidence from rat physiological exercise model.
Biochem Biophys Res Commun
December 2024
Laboratory of Exercise Biochemistry and Neuroendocrinology, Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8574, Japan; Division of Sport Neuroscience, Kokoro Division, Advanced Research Initiative for Human High Performance (ARIHHP), Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8574, Japan. Electronic address:
Exercise benefits the brain, particularly the learning and memory center-the dorsal hippocampus (dHPC)-and holds promise for therapeutic applications addressing age-related cognitive deficits. While moderate-to-vigorous-intensity exercise is commonly recommended for health benefits, our translational research proposes the effectiveness of very-light-intensity exercise in enhancing cognitive functions. However, the intensity-dependent characteristics of HPC activation have yet to be fully delineated; therefore, there is no evidence of whether such easily accessible exercises for people of all ages and most fitness levels can activate HPC neurons.
View Article and Find Full Text PDFCardiorespiratory fitness, hippocampal subfield morphology, and episodic memory in older adults.
Front Aging Neurosci
December 2024
Department of Psychology, University of Pittsburgh, Pittsburgh, PA, United States.
Objective: Age-related hippocampal atrophy is associated with memory loss in older adults, and certain hippocampal subfields are more vulnerable to age-related atrophy than others. Cardiorespiratory fitness (CRF) may be an important protective factor for preserving hippocampal volume, but little is known about how CRF relates to the volume of specific hippocampal subfields, and whether associations between CRF and hippocampal subfield volumes are related to episodic memory performance. To address these gaps, the current study evaluates the associations among baseline CRF, hippocampal subfield volumes, and episodic memory performance in cognitively unimpaired older adults from the Investigating Gains in Neurocognition Trial of Exercise (IGNITE) (NCT02875301).
View Article and Find Full Text PDFNeuroprotective Effect of Curcumin-Metavanadate in the Hippocampus of Aged Rats.
Synapse
January 2025
Institute of Physiology, Benemerita Autonomous University of Puebla, Puebla, Mexico.
Brain aging is a multifactorial process that includes a reduction in the biological and metabolic activity of individuals. Oxidative stress and inflammatory processes are characteristic of brain aging. Given the current problems, the need arises to implement new therapeutic approaches.
View Article and Find Full Text PDFDistinct roles of dentate gyrus and medial entorhinal cortex inputs for phase precession and temporal correlations in the hippocampal CA3 area.
Nat Commun
January 2025
Neurobiology Department, School of Biological Sciences, University of California, San Diego, CA, USA.
The hippocampal CA3 subregion is a densely connected recurrent circuit that supports memory by generating and storing sequential neuronal activity patterns that reflect recent experience. While theta phase precession is thought to be critical for generating sequential activity during memory encoding, the circuit mechanisms that support this computation across hippocampal subregions are unknown. By analyzing CA3 network activity in the absence of each of its theta-modulated external excitatory inputs, we show necessary and unique contributions of the dentate gyrus (DG) and the medial entorhinal cortex (MEC) to phase precession.
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