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https://www.readbyqxmd.com/read/29352126/role-of-subcortical-structures-on-cognitive-and-social-function-in-schizophrenia
#1
Daisuke Koshiyama, Masaki Fukunaga, Naohiro Okada, Fumio Yamashita, Hidenaga Yamamori, Yuka Yasuda, Michiko Fujimoto, Kazutaka Ohi, Haruo Fujino, Yoshiyuki Watanabe, Kiyoto Kasai, Ryota Hashimoto
Subcortical regions have a pivotal role in cognitive, affective, and social functions in humans, and the structural and functional abnormalities of the regions have been associated with various psychiatric disorders. Although previous studies focused on the neurocognitive and socio-functional consequences of prefrontal and tempolo-limbic abnormalities in psychiatric disorders, those of subcortical structures remain largely unknown. Recently, MRI volume alterations in subcortical structures in patients with schizophrenia have been replicated in large-scale meta-analytic studies...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351398/visceral-hypersensitivity-induced-by-optogenetic-activation-of-the-amygdala-in-conscious-rats
#2
Anthony C Johnson, Rocco Latorre, Casey O Ligon, Beverley Greenwood-Van Meerveld
In vivo optogenetics identifies brain circuits controlling behaviors in conscious animals by using light to alter neuronal function and offers a novel tool to study the brain-gut axis. Using adenoviral-mediated expression, we aimed to investigate whether photoactivation with channelrhodopsin (ChR2) or photoinhibition with halorhodopsin (HR3.0) of fibers originating from the central nucleus of the amygdala (CeA) at the bed nucleus of the stria terminalis (BNST) had any effect on colonic sensitivity. We also investigated whether that there was any deleterious effect of the adenovirus on the neuronal population or the neuronal phenotype within the CeA-BNST circuitry activated during the optogenetic stimulation...
December 14, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29351171/spinal-pkc-erk-signal-pathway-mediates-hyperalgesia-priming
#3
Wei-Hsin Chen, Ya-Ting Chang, Yong-Cyuan Chen, Sin-Jhong Cheng, Chien-Chang Chen
Chronic pain can be initiated by one or more acute stimulations to sensitize neurons into the primed state. In the primed state, the basal nociceptive thresholds of the animal are normal, but in response to another hyperalgesic stimulus, the animal develops enhanced and prolonged hyperalgesia. The exact mechanism of how primed state is formed is not completely understood. Here we showed that spinal PKC/ERK signal pathway is required for neuronal plasticity change, hyperalgesic priming formation and the development of chronic hyperalgesia using acid-induced muscle pain (AIMP) model in mice...
January 18, 2018: Pain
https://www.readbyqxmd.com/read/29350251/pyramidal-cell-selective-glun1-knockout-causes-impairments-in-salience-attribution-and-related-eeg-activity
#4
Alexandra D Forrest, Jakyung Bang, Robert E Featherstone, Jonathan H Bloom, Matthew S Luminais, Rebecca V Zhang, Christopher R Gajewski, Mary F McMullen, Yuling Liang, Steven J Siegel
Schizophrenia is a disabling psychiatric disease characterized by symptoms including hallucinations, delusions, social withdrawal, loss of pleasure, and inappropriate affect. Although schizophrenia is marked by dysfunction in dopaminergic and glutamatergic signaling, it is not presently clear how these dysfunctions give rise to symptoms. The aberrant salience hypothesis of schizophrenia argues that abnormal attribution of motivational salience to stimuli is one of the main contributors to both positive and negative symptoms of schizophrenia...
January 19, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29349037/family-history-of-alcoholism-and-the-human-brain-response-to-oral-sucrose
#5
William J A Eiler, Mario Dzemidzic, Christina M Soeurt, Claire R Carron, Brandon G Oberlin, Robert V Considine, Jaroslaw Harezlak, David A Kareken
A heightened hedonic response to sweet tastes has been associated with increased alcohol preference and alcohol consumption in both humans and animals. The principal goal of this study was to examine blood oxygenation level dependent (BOLD) activation to high- and low-concentration sweet solutions in subjects who are either positive (FHP) or negative (FHN) for a family history of alcoholism. Seventy-four non-treatment seeking, community-recruited, healthy volunteers (22.8 ± 1.6 SD years; 43% men) rated a range of sucrose concentrations in a taste test and underwent functional magnetic resonance imaging (fMRI) during oral delivery of water, 0...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29348729/panax-ginseng-exerts-antidepressant-like-effects-by-suppressing-neuroinflammatory-response-and-upregulating-nuclear-factor-erythroid-2-related-factor-2-signaling-in-the-amygdala
#6
Jong Hee Choi, Min Jung Lee, Minhee Jang, Hak-Jae Kim, Sanghyun Lee, Sang Won Lee, Young Ock Kim, Ik-Hyun Cho
Background: Depression is one of the most commonly diagnosed neuropsychiatric diseases, but the underlying mechanism and medicine are not well-known. Although Panax ginseng has been reported to exert protective effects in various neurological studies, little information is available regarding its antidepressant effects. Methods: Here, we examined the antidepressant effect and underlying mechanism of P. ginseng extract (PGE) in a chronic restraint stress (CRS)-induced depression model in mice...
January 2018: Journal of Ginseng Research
https://www.readbyqxmd.com/read/29348532/amygdala-orbitofrontal-structural-and-functional-connectivity-in-females-with-anxiety-disorders-with-and-without-a-history-of-conduct-disorder
#7
Philip Lindner, Pär Flodin, Peter Larm, Meenal Budhiraja, Ivanka Savic-Berglund, Jussi Jokinen, Jari Tiihonen, Sheilagh Hodgins
Conduct disorder (CD) and anxiety disorders (ADs) are often comorbid and both are characterized by hyper-sensitivity to threat, and reduced structural and functional connectivity between the amygdala and orbitofrontal cortex (OFC). Previous studies of CD have not taken account of ADs nor directly compared connectivity in the two disorders. We examined three groups of young women: 23 presenting CD and lifetime AD; 30 presenting lifetime AD and not CD; and 17 with neither disorder (ND). Participants completed clinical assessments and diffusion-weighted and resting-state functional MRI scans...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348040/negative-valence-in-autism-spectrum-disorder-the-relationship-between-amygdala-activity-selective-attention-and-co-occurring-anxiety
#8
John D Herrington, Brenna B Maddox, Alana J McVey, Martin E Franklin, Benjamin E Yerys, Judith S Miller, Robert T Schultz
BACKGROUND: A critical agenda of the National Institutes of Health Research Domain Criteria (RDoC) initiative is establishing whether domains within the RDoC matrix are truly transdiagnostic. Rates of anxiety disorders are elevated in autism spectrum disorder (ASD), but it is unclear whether the same mechanisms contribute to anxiety in individuals with and without ASD. As changes in selective attention are a hallmark of anxiety disorders in non-ASD samples, the identification of these changes in ASD would support the transdiagnostic nature of anxiety...
September 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29346088/intense-olfactory-stimulation-blocks-seizures-in-an-experimental-model-of-epilepsy
#9
Polianna Delfino-Pereira, Poliana Bertti-Dutra, Eduardo Henrique de Lima Umeoka, José Antônio Cortes de Oliveira, Victor Rodrigues Santos, Artur Fernandes, Simone Saldanha Marroni, Flávio Del Vecchio, Norberto Garcia-Cairasco
There are reports of patients whose epileptic seizures are prevented by means of olfactory stimulation. Similar findings were described in animal models of epilepsy, such as the electrical kindling of amygdala, where olfactory stimulation with toluene (TOL) suppressed seizures in most rats, even when the stimuli were 20% above the threshold to evoke seizures in already kindled animals. The Wistar Audiogenic Rat (WAR) strain is a model of tonic-clonic seizures induced by acute acoustic stimulation, although it also expresses limbic seizures when repeated acoustic stimulation occurs - a process known as audiogenic kindling (AK)...
January 12, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29344473/intractable-epilepsy-with-solitary-cerebral-calcification
#10
Kyoung Jin Hwang, Jiyoung Kim, Eun Yeon Joo, Seung Bong Hong, Seung-Chyul Hong, Dae Won Seo
Cerebral calcification is a common incidental finding upon brain imaging and its epileptogenicity is often underestimated. Here, we report a case of intractable epilepsy arising in conjunction with a solitary cerebral calcification. A 42-year-old male with intractable epilepsy was admitted to the epilepsy clinic for invasive epilepsy surgery. Brain magnetic resonance imaging revealed a slight high-intensity signal change in the right amygdala and a small, calcified lesion in the right lateral temporal region...
December 2017: Journal of Epilepsy Research
https://www.readbyqxmd.com/read/29343732/the-neural-correlates-of-the-unified-percept-of-alcohol-related-craving-a-fmri-and-eeg-study
#11
Yuefeng Huang, Anusha Mohan, Dirk De Ridder, Stefan Sunaert, Sven Vanneste
Alcohol addiction is accompanied by aberrant neural activity. Previously, task-based fMRI and resting-state EEG studies have revealed that craving, a critical component of addiction, is linked to abnormal activity in cortical regions including the dorsal anterior cingulate cortex (dACC), nucleus accumbens (NAcc), posterior cingulate cortex (PCC) and pregenual anterior cingulate cortex (pgACC), etc. In this study, we combine these two imaging techniques to investigate a group of alcohol-addicted patients and provide convergent evidence for the neural correlates of craving not only in alcohol but substance abuse in general...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29342237/the-roles-of-subdivisions-of-human-insula-in-emotion-perception-and-auditory-processing
#12
Yang Zhang, Wenjing Zhou, Siyu Wang, Qin Zhou, Haixiang Wang, Bingqing Zhang, Juan Huang, Bo Hong, Xiaoqin Wang
Previous studies have shown insular activations involving sensory, motor, and affective processing. However, the functional roles of subdivisions within the human insula are still not well understood. In the present study, we used intracranial electroencephalography and electrical cortical stimulation to investigate the causal roles of subdivisions of the insula in auditory emotion perception in epilepsy patients implanted with depth electrodes in this brain region. The posterior and the anterior subdivisions of the human insula, identified based on structural and functional analyses, showed distinct response properties to auditory emotional stimuli...
January 12, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29341883/title-brain-region-specific-molecular-responses-to-maternal-separation-and-social-defeat-stress-in-mice
#13
Benjamin D Sachs, Ha L Tran, Emily Folse, Marc G Caron
The association between stress and mental illness has been well documented, but the molecular consequences of repeated exposure to stress have not been completely identified. The present study sought to elucidate the combinatorial effects of early life maternal separation stress and adult social defeat stress on alterations in signal transduction and gene expression that have been previously implicated in susceptibility to psychosocial stress. Molecular analyses were performed in the prelimbic/infralimbic cortex, amygdala, and nucleus accumbens, three brain regions that have been suggested to play critical roles in determining stress responses...
January 13, 2018: Neuroscience
https://www.readbyqxmd.com/read/29340757/comparing-brain-activity-patterns-during-spontaneous-exploratory-and-cue-instructed-learning-using-single-photon-emission-computed-tomography-spect-imaging-of-regional-cerebral-blood-flow-in-freely-behaving-rats
#14
A Mannewitz, J Bock, S Kreitz, A Hess, J Goldschmidt, H Scheich, Katharina Braun
Learning can be categorized into cue-instructed and spontaneous learning types; however, so far, there is no detailed comparative analysis of specific brain pathways involved in these learning types. The aim of this study was to compare brain activity patterns during these learning tasks using the in vivo imaging technique of single photon-emission computed tomography (SPECT) of regional cerebral blood flow (rCBF). During spontaneous exploratory learning, higher levels of rCBF compared to cue-instructed learning were observed in motor control regions, including specific subregions of the motor cortex and the striatum, as well as in regions of sensory pathways including olfactory, somatosensory, and visual modalities...
January 16, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29339476/coding-of-episodic-memory-in-the-human-hippocampus
#15
John T Wixted, Stephen D Goldinger, Larry R Squire, Joel R Kuhn, Megan H Papesh, Kris A Smith, David M Treiman, Peter N Steinmetz
Neurocomputational models have long posited that episodic memories in the human hippocampus are represented by sparse, stimulus-specific neural codes. A concomitant proposal is that when sparse-distributed neural assemblies become active, they suppress the activity of competing neurons (neural sharpening). We investigated episodic memory coding in the hippocampus and amygdala by measuring single-neuron responses from 20 epilepsy patients (12 female) undergoing intracranial monitoring while they completed a continuous recognition memory task...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29339324/oscillatory-synchronous-inhibition-in-the-basolateral-amygdala-and-its-primary-dependence-on-nr2a-containing-nmda-receptors
#16
Vassiliki Aroniadou-Anderjaska, Volodymyr I Pidoplichko, Taiza H Figueiredo, Maria F M Braga
Synchronous, rhythmic firing of GABAergic interneurons is a fundamental mechanism underlying the generation of brain oscillations, and evidence suggests that NMDA receptors (NMDARs) play a key role in oscillatory activity by regulating the activity of interneurons. Consistent with this, derangement of brain rhythms in certain neuropsychiatric disorders, notably schizophrenia and autism, is associated with NMDAR hypofunction and loss of inhibitory interneurons. In the basolateral amygdala (BLA)-dysfunction of which is involved in a host of neuropsychiatric diseases-, principal neurons display spontaneous, rhythmic "bursts" of inhibitory activity, which could potentially be involved in the orchestration of oscillations in the BLA network; here, we investigated the role of NMDARs in these inhibitory oscillations...
January 12, 2018: Neuroscience
https://www.readbyqxmd.com/read/29339309/late-chronotype-is-associated-with-enhanced-amygdala-reactivity-and-reduced-fronto-limbic-functional-connectivity-to-fearful-versus-happy-facial-expressions
#17
Charlotte Mary Horne, Ray Norbury
Increasing evidence suggests late chronotype individuals are at increased risk of developing depression. However, the underlying neural mechanisms that confer risk are not fully understood. Here, fifty healthy, right-handed individuals without a current or previous diagnosis of depression, family history of depression or sleep disorder underwent functional magnetic resonance imaging (FMRI). Participants completed an implicit emotion processing task (gender discrimination) including happy and fearful facial expressions...
January 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29336775/neural-correlates-of-emotional-action-control-in-anger-prone-women-with-borderline-personality-disorder
#18
Katja Bertsch, Karin Roelofs, Paul Jonathan Roch, Bo Ma, Saskia Hensel, Sabine C Herpertz, Inge Volman
BACKGROUND: Difficulty in controlling emotional impulses is a crucial component of borderline personality disorder (BPD) that often leads to destructive, impulsive behaviours against others. In line with recent findings in aggressive individuals, deficits in prefrontal amygdala coupling during emotional action control may account for these symptoms. METHODS: To study the neurobiological correlates of altered emotional action control in individuals with BPD, we asked medication-free, anger-prone, female patients with BPD and age- and intelligence-matched healthy women to take part in an approach-avoidance task while lying in an MRI scanner...
January 12, 2018: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/29333482/flexibility-in-the-face-of-fear-hippocampal-prefrontal-regulation-of-fear-and-avoidance
#19
Justin M Moscarello, Stephen Maren
Generating appropriate defensive behaviors in the face of threat is essential to survival. Although many of these behaviors are 'hard-wired', they are also flexible. For example, Pavlovian fear conditioning generates learned defensive responses, such as conditioned freezing, that can be suppressed through extinction. The expression of extinguished responses is highly context-dependent, allowing animals to engage behavioral responses appropriate to the contexts in which threats are encountered. Likewise, animals and humans will avoid noxious outcomes if given the opportunity...
February 2018: Current Opinion in Behavioral Sciences
https://www.readbyqxmd.com/read/29332063/diffusion-tensor-imaging-investigation-of-uncinate-fasciculus-anatomy-in-healthy-controls-description-of-a-subgenual-stem
#20
Kartik Bhatia, Luke Henderson, Mark Yim, Eugene Hsu, Rajiv Dhaliwal
The uncinate fasciculus is the largest white matter association tract connecting the prefrontal cortex and the anteromedial temporal lobe. The traditional anatomical description outlines a temporal stem that hooks around the posterior insula, a subinsular body, and 2 prefrontal stems extending to the lateral orbital gyri and the frontopolar cortex. Recent imaging studies of the white matter tracts deep to the subgenual cingulate gyrus (Brodmann area 25: BA25) suggest the presence of white matter fibers extending from BA25 to the amygdala, via a route that would run in close proximity to the uncinate fasciculus, that are of functional importance in mood disorders...
January 12, 2018: Neuropsychobiology
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