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https://www.readbyqxmd.com/read/29333688/infant-brain-responses-to-felt-and-observed-touch-of-hands-and-feet-an-meg-study
#1
Andrew N Meltzoff, Rey R Ramírez, Joni N Saby, Eric Larson, Samu Taulu, Peter J Marshall
There is growing interest concerning the ways in which the human body, both one's own and that of others, is represented in the developing human brain. In two experiments with 7-month-old infants, we employed advances in infant magnetoencephalography (MEG) brain imaging to address novel questions concerning body representations in early development. Experiment 1 evaluated the spatiotemporal organization of infants' brain responses to being touched. A punctate touch to infants' hands and feet produced significant activation in the hand and foot areas of contralateral primary somatosensory cortex as well as in other parietal and frontal areas...
January 14, 2018: Developmental Science
https://www.readbyqxmd.com/read/29331450/mapping-stimulus-feature-selectivity-in-macaque-v1-by-two-photon-ca2-imaging-encoding-model-analysis-of-fluorescence-responses-to-natural-movies
#2
REVIEW
Koji Ikezoe, Mahya Amano, Shinji Nishimoto, Ichiro Fujita
In vivo calcium (Ca2+) imaging using two-photon microscopy allows activity to be monitored simultaneously from hundreds of individual neurons within a local population. While this allows us to gain important insights into how cortical neurons represent sensory information, factors such as photo-bleaching of the Ca2+ indicator limit imaging duration (and thus the numbers of stimuli that can be tested), which in turn hampers the full characterization of neuronal response properties. Here, we demonstrate that using an encoding model combined with presentation of natural movies results in detailed characterization of receptive field (RF) properties despite the relatively short time for data collection...
January 10, 2018: NeuroImage
https://www.readbyqxmd.com/read/29330457/spatially-selective-responses-to-kanizsa-and-occlusion-stimuli-in-human-visual-cortex
#3
Benjamin de Haas, Dietrich Samuel Schwarzkopf
Early visual cortex responds to illusory contours in which abutting lines or collinear edges imply the presence of an occluding surface, as well as to occluded parts of an object. Here we used functional magnetic resonance imaging (fMRI) and population receptive field (pRF) analysis to map retinotopic responses in early visual cortex using bar stimuli defined by illusory contours, occluded parts of a bar, or subtle luminance contrast. All conditions produced retinotopic responses in early visual field maps even though signal-to-noise ratios were very low...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330136/white-matter-volume-loss-in-amyotrophic-lateral-sclerosis-a-meta-analysis-of-voxel-based-morphometry-studies
#4
REVIEW
Guangxiang Chen, Baiwan Zhou, Hongyan Zhu, Weihong Kuang, Feng Bi, Hua Ai, Zhongwei Gu, Xiaoqi Huang, Su Lui, Qiyong Gong
Structural neuroimaging studies of white matter (WM) volume in amyotrophic lateral sclerosis (ALS) using voxel-based morphometry (VBM) have yielded inconsistent findings. This study aimed to perform a quantitative voxel-based meta-analysis using effect-size signed differential mapping (ES-SDM) to establish a statistical consensus between published studies for WM volume alterations in ALS. The pooled meta-analysis revealed significant WM volume losses in the bilateral supplementary motor areas (SMAs), bilateral precentral gyri (PGs), left middle cerebellar peduncle and right cerebellum in patients with ALS, involving the corticospinal tract (CST), interhemispheric fibers, subcortical arcuate fibers, projection fibers to the striatum and cortico-ponto-cerebellar tract...
January 9, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29323751/-18-f-av-1451-clustering-of-entorhinal-and-cortical-uptake-in-alzheimer-s-disease
#5
Jennifer L Whitwell, Jonathan Graff-Radford, Nirubol Tosakulwong, Stephen D Weigand, Mary Machulda, Matthew L Senjem, Christopher G Schwarz, Anthony J Spychalla, David T Jones, Daniel A Drubach, David S Knopman, Bradley F Boeve, Nilüfer Ertekin-Taner, Ronald C Petersen, Val J Lowe, Clifford R Jack, Keith A Josephs
OBJECTIVE: To use a cluster analysis of [18 F]AV-1451 tau-PET data to determine how subjects with Alzheimer's disease vary in the relative involvement of the entorhinal cortex and neocortex, and determine whether relative involvement of these two regions can help explain variability in age and clinical phenotype in Alzheimer's disease. METHODS: We calculated [18 F]AV-1451 uptake in entorhinal cortex and neocortex in 62 amyloid-positive Alzheimer's disease patients (39 typical and 23 atypical presentation)...
January 11, 2018: Annals of Neurology
https://www.readbyqxmd.com/read/29322586/functional-connectivity-predicts-gender-evidence-for-gender-differences-in-resting-brain-connectivity
#6
Chao Zhang, Chase C Dougherty, Stefi A Baum, Tonya White, Andrew M Michael
Prevalence of certain forms of psychopathology, such as autism and depression, differs between genders and understanding gender differences of the neurotypical brain may provide insights into risk and protective factors. In recent research, resting state functional magnetic resonance imaging (rfMRI) is widely used to map the inherent functional networks of the brain. Although previous studies have reported gender differences in rfMRI, the robustness of gender differences is not well characterized. In this study, we use a large data set to test whether rfMRI functional connectivity (FC) can be used to predict gender and identify FC features that are most predictive of gender...
January 10, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29322264/cerebral-gray-matter-volume-in-patients-with-chronic-migraine-correlations-with-clinical-features
#7
Gianluca Coppola, Barbara Petolicchio, Antonio Di Renzo, Emanuele Tinelli, Cherubino Di Lorenzo, Vincenzo Parisi, Mariano Serrao, Valentina Calistri, Stefano Tardioli, Gaia Cartocci, Anna Ambrosini, Francesca Caramia, Vittorio Di Piero, Francesco Pierelli
BACKGROUND: To date, few MRI studies have been performed in patients affected by chronic migraine (CM), especially in those without medication overuse. Here, we performed magnetic resonance imaging (MRI) voxel-based morphometry (VBM) analyses to investigate the gray matter (GM) volume of the whole brain in patients affected by CM. Our aim was to investigate whether fluctuations in the GM volumes were related to the clinical features of CM. METHODS: Twenty untreated patients with CM without a past medical history of medication overuse underwent 3-Tesla MRI scans and were compared to a group of 20 healthy controls (HCs)...
December 8, 2017: Journal of Headache and Pain
https://www.readbyqxmd.com/read/29322238/development-of-inhibitory-synaptic-inputs-on-layer-2-3-pyramidal-neurons-in-the-rat-medial-prefrontal-cortex
#8
Mari A Virtanen, Claudia Marvine Lacoh, Hubert Fiumelli, Markus Kosel, Shiva Tyagarajan, Mathias de Roo, Laszlo Vutskits
Inhibitory control of pyramidal neurons plays a major role in governing the excitability in the brain. While spatial mapping of inhibitory inputs onto pyramidal neurons would provide important structural data on neuronal signaling, studying their distribution at the single cell level is difficult due to the lack of easily identifiable anatomical proxies. Here, we describe an approach where in utero electroporation of a plasmid encoding for fluorescently tagged gephyrin into the precursors of pyramidal cells along with ionotophoretic injection of Lucifer Yellow can reliably and specifically detect GABAergic synapses on the dendritic arbour of single pyramidal neurons...
January 10, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29317593/loneliness-5-years-ante-mortem-is-associated-with-disease-related-differential-gene-expression-in-postmortem-dorsolateral-prefrontal-cortex
#9
Turhan Canli, Lei Yu, Xiaoqing Yu, Hongyu Zhao, Debra Fleischman, Robert S Wilson, Philip L De Jager, David A Bennett
Subjective social isolation, loneliness, is associated with poor mental and physical health, but the underlying molecular mechanisms are poorly understood. Here we analyzed loneliness data collected on average 5 years ante-mortem and RNA gene expression at death in postmortem dorsolateral prefrontal cortex (DLPFC) from 181 participants in the Rush Memory and Aging Project (MAP), a longitudinal, prospective cohort study of common chronic conditions of aging. Our analytic protocol controlled for biographical variables (age, sex, education), psychological and health variables (depressive symptoms, interval between assessment and autopsy, slope of cognitive decline, AD pathology, presence of infarcts) and RNA integrity...
January 10, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29317306/double-dissociation-of-structure-function-relationships-in-memory-and-fluid-intelligence-observed-with-magnetic-resonance-elastography
#10
Curtis L Johnson, Hillary Schwarb, Kevin M Horecka, Matthew D J McGarry, Charles H Hillman, Arthur F Kramer, Neal J Cohen, Aron K Barbey
Brain tissue mechanical properties, measured in vivo with magnetic resonance elastography (MRE), have proven to be sensitive metrics of neural tissue integrity. Recently, our group has reported on the positive relationship between viscoelasticity of the hippocampus and performance on a relational memory task in healthy young adults, which highlighted the potential of sensitive MRE measures for studying brain health and its relation to cognitive function; however, structure-function relationships outside of the hippocampus have not yet been explored...
January 6, 2018: NeuroImage
https://www.readbyqxmd.com/read/29317247/development-of-stereotaxic-recording-system-for-awake-marmosets-callithrix-jacchus
#11
Masahiro Wakabayashi, Daisuke Koketsu, Hideki Kondo, Shigeki Sato, Kiichi Ohara, Zlata Polyakova, Satomi Chiken, Nobuhiko Hatanaka, Atsushi Nambu
The common marmoset has been proposed as a potential alternative to macaque monkey as a primate model for neuroscience and medical research. Here, we have newly developed a stereotaxic neuronal recording system for awake marmosets under the head-fixed condition by modifying that for macaque monkeys. Using this system, we recorded neuronal activity in the cerebral cortex of awake marmosets and successfully identified the primary motor cortex by intracortical microstimulation. Neuronal activities of deep brain structures, such as the basal ganglia, thalamus, and cerebellum, in awake marmosets were also successfully recorded referring to magnetic resonance images...
January 6, 2018: Neuroscience Research
https://www.readbyqxmd.com/read/29315817/dynamic-measurement-of-oxygen-extraction-fraction-using-a-multiecho-asymmetric-spin-echo-mase-pulse-sequence
#12
Yayan Yin, Yaoyu Zhang, Jia-Hong Gao
PURPOSE: The oxygen extraction fraction (OEF), an important parameter for assessing brain oxygen metabolism, is a key marker of brain health. Dynamic measurement of the OEF is currently limited by the long acquisition time. In this study, a noninvasive method for rapidly and effectively assessing dynamic changes in the OEF during brain stimulation is proposed. METHODS: A novel pulse sequence using the multi-echo asymmetric spin echo with an echo-planar imaging acquisition scheme was developed to improve the temporal resolution of functional OEF measurements...
January 8, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29315361/networks-of-tau-distribution-in-alzheimer-s-disease
#13
Merle C Hoenig, Gérard N Bischof, Joseph Seemiller, Jochen Hammes, Juraj Kukolja, Özgür A Onur, Frank Jessen, Klaus Fliessbach, Bernd Neumaier, Gereon R Fink, Thilo van Eimeren, Alexander Drzezga
A stereotypical anatomical propagation of tau pathology has been described in Alzheimer's disease. According to recent concepts (network degeneration hypothesis), this propagation is thought to be indicative of misfolded tau proteins possibly spreading along functional networks. If true, tau pathology accumulation should correlate in functionally connected brain regions. Therefore, we examined whether independent components could be identified in the distribution pattern of in vivo tau pathology and whether these components correspond with specific functional connectivity networks...
January 5, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29311746/hexadirectional-coding-of-visual-space-in-human-entorhinal-cortex
#14
Matthias Nau, Tobias Navarro Schröder, Jacob L S Bellmund, Christian F Doeller
Entorhinal grid cells map the local environment, but their involvement beyond spatial navigation remains elusive. We examined human functional MRI responses during a highly controlled visual tracking task and show that entorhinal cortex exhibited a sixfold rotationally symmetric signal encoding gaze direction. Our results provide evidence for a grid-like entorhinal code for visual space and suggest a more general role of the entorhinal grid system in coding information along continuous dimensions.
January 8, 2018: Nature Neuroscience
https://www.readbyqxmd.com/read/29311139/retrosplenial-cortex-indexes-stability-beyond-the-spatial-domain
#15
Stephen D Auger, Eleanor A Maguire
Retrosplenial cortex (RSC) is highly responsive to landmarks in the environment which remain fixed in a permanent location, and this has been linked with its known involvement in scene and spatial processing. However, it is unclear if RSC representations of permanence are a purely spatial phenomenon or whether they extend into behavioural and conceptual domains. To test this, during functional MRI (fMRI) scanning we had people (males and females) read three different types of sentence which described either something permanent or transient...
January 8, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29305535/an-insula-central-amygdala-circuit-for-guiding-tastant-reinforced-choice-behavior
#16
Hillary Schiff, Anna Lien Bouhuis, Kai Yu, Mario A Penzo, Haohong Li, Miao He, Bo Li
Predicting which substances are suitable for consumption during foraging is critical for animals to survive. Despite extensive study, the neural circuit mechanisms underlying such adaptive behavior remain poorly understood. Here we examined the anatomical and functional connectivity of the insular cortex (IC) to central amygdala (CeA) circuit and the role of this circuit in the establishment of appropriate behavioral responses in a tastant (sucrose/quinine)-reinforced "go/no-go" task in male and female mice...
January 5, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29305158/tbr2-antagonizes-retinoic-acid-dependent-neuronal-differentiation-by-repressing-zfp423-during-corticogenesis
#17
Luca Massimino, Lisbeth Flores-Garcia, Bruno Di Stefano, Gaia Colasante, Cecilia Icoresi-Mazzeo, Mattia Zaghi, Bruce A Hamilton, Alessandro Sessa
During cerebral cortex development, neural progenitors are required to elaborate a variety of cell differentiation signals to which they are continuously exposed. RA acid is a potent inducer of neuronal differentiation as it was found to influence cortical development. We report herein that TBR2, a transcription factor specific to Intermediate (Basal) Neural Progenitors (INPs), represses activation of the RA responsive element and expression of RA target genes in cell lines. This repressive action on RA signaling was functionally confirmed by the decrease of RA-mediated neuronal differentiation in neural stem cells stably overexpressing TBR2...
January 2, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29304099/functional-magnetic-resonance-imaging-reveals-differences-in-brain-activation-in-response-to-thermal-stimuli-in-diabetic-patients-with-and-without-diabetic-peripheral-neuropathy
#18
Juan Li, Wanying Zhang, Xia Wang, Tangmi Yuan, Peiyao Liu, Tao Wang, Le Shen, Yuguang Huang, Naishi Li, Hui You, Tixian Xiao, Feng Feng, Chao Ma
INTRODUCTION: Diabetes affects both the peripheral and central nervous systems. The aim of this study was to explore the changes in brain activity in response to thermal stimuli in diabetic patients with and without diabetic peripheral neuropathy (DPN) using functional magnetic resonance imaging (fMRI). METHODS: A total of 36 right-handed volunteers were enrolled: eight patients with Type-2 diabetes mellitus and DPN, 13 patients with Type-2 diabetes mellitus lacking DPN (NDPN patients), and 15 healthy volunteers (HV)...
2018: PloS One
https://www.readbyqxmd.com/read/29301873/visually-driven-maps-in-area-3b
#19
Esther Kuehn, Patrick Haggard, Arno Villringer, Burkhard Pleger, Martin I Sereno
Sensory perception relies on the precise neuronal encoding of modality-specific environmental features in primary sensory cortices. Some studies have reported the penetration of signals from other modalities even into early sensory areas. So far, no comprehensive account of maps induced by "foreign sources" exists. We addressed this question using surface-based topographic mapping techniques applied to ultra-high resolution fMRI neuroimaging data, measured in female participants. We show that fine-grained finger maps in human primary somatosensory cortex, area 3b, are somatotopically activated not only during tactile mechanical stimulation, but also when viewing the same fingers being touched...
January 4, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29301613/testing-olfactory-function-and-mapping-the-structural-olfactory-networks-in-the-brain
#20
Alexander Fjældstad
We perceive the world through our senses. The dependence on these sensory stimuli becomes obvious when we see a visually impaired individual with a guide dog or an individual using sign language. However, individuals with olfactory deficits suffer from a more concealed impairment without any opportunity for diagnostics or treatment in the Danish healthcare system. Around a fifth of the population experience olfactory deficits, of which 1-2% are functionally anosmic. The personal consequences for anosmics can be extensive, lacking not only in hedonic yield related to eating and drinking, but also the socialization during dinners can become niggling...
January 2018: Danish Medical Journal
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