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Dementia Care Research and Psychosocial Factors.
Alzheimers Dement
December 2024
Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, CA, USA.
Background: Aging associates with decreased functional connectivity between brain regions linked to musical rhythm perception. Producing rhythmic music may result in strengthened functional connectivity of these regions, but more evidence is needed to support intervention design. Currently, few studies directly contrast younger and older adults' rhythmic music performance to understand brain-behavior relationships.
View Article and Find Full Text PDFRecurrent activity propagates through labile ensembles in macaque dorsolateral prefrontal microcircuits.
Curr Biol
December 2024
Department of Pharmacology, Vanderbilt Brain Institute, Vanderbilt Center for Addiction Research, Vanderbilt University, Nashville, TN 37232, USA; Department of Anatomy, Cell Biology, & Physiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA. Electronic address:
Human and non-human primate studies clearly implicate the dorsolateral prefrontal cortex (dlPFC) as critical for advanced cognitive functions. It is thought that intracortical synaptic architectures within the dlPFC are the integral neurobiological substrate that gives rise to these processes. In the prevailing model, each cortical column makes up one fundamental processing unit composed of dense intrinsic connectivity, conceptualized as the "canonical" cortical microcircuit.
View Article and Find Full Text PDFSparse coding enables cortical populations to represent sensory inputs efficiently, yet its temporal dynamics remain poorly understood. Consistent with theoretical predictions, we show that stimulus onset triggers broad cortical activation, initially reducing sparseness and increasing mutual information. Subsequently, competitive interactions sustain mutual information as activity declines and sparseness increases.
View Article and Find Full Text PDFHierarchical representations of relative numerical magnitudes in the human frontoparietal cortex.
Nat Commun
January 2025
Center for Information and Neural Networks (CiNet), Advanced ICT Research Institute, National Institute of Information and Communications Technology, Suita, Japan.
The ability to estimate numerical magnitude is essential for decision-making and is thought to underlie arithmetic skills. In humans, neural populations in the frontoparietal regions are tuned to represent numerosity. However, it remains unclear whether their response properties are fixed to a specific numerosity (i.
View Article and Find Full Text PDFAllocentric and egocentric spatial representations coexist in rodent medial entorhinal cortex.
Nat Commun
January 2025
Department of Neurosurgery, Xinqiao Hospital, Army Medical University, Chongqing, China.
Successful navigation relies on reciprocal transformations between spatial representations in world-centered (allocentric) and self-centered (egocentric) frames of reference. The neural basis of allocentric spatial representations has been extensively investigated with grid, border, and head-direction cells in the medial entorhinal cortex (MEC) forming key components of a 'cognitive map'. Recently, egocentric spatial representations have also been identified in several brain regions, but evidence for the coexistence of neurons encoding spatial variables in each reference frame within MEC is so far lacking.
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