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https://www.readbyqxmd.com/read/27907151/changes-in-galanin-systems-in-a-rat-model-of-post-traumatic-stress-disorder-ptsd
#1
Karen Barnabas, Lin Zhang, Huiying Wang, Gilbert Kirouac, Maria Vrontakis
Post-traumatic stress disorder (PTSD) is a chronic syndrome triggered by exposure to trauma and a failure to recover from a normal negative emotional reaction to traumatic stress. The neurobiology of PTSD and the participation of neuropeptides in the neural systems and circuits that control fear and anxiety are not fully understood. The long-term dysregulation of neuropeptide systems contributes to the development of anxiety disorders, including PTSD. The neuropeptide galanin (Gal) and its receptors participate in anxiety-like and depression-related behaviors via the modulation of neuroendocrine and monoaminergic systems...
2016: PloS One
https://www.readbyqxmd.com/read/27905080/a-neural-model-of-normal-and-abnormal-learning-and-memory-consolidation-adaptively-timed-conditioning-hippocampus-amnesia-neurotrophins-and-consciousness
#2
Daniel J Franklin, Stephen Grossberg
How do the hippocampus and amygdala interact with thalamocortical systems to regulate cognitive and cognitive-emotional learning? Why do lesions of thalamus, amygdala, hippocampus, and cortex have differential effects depending on the phase of learning when they occur? In particular, why is the hippocampus typically needed for trace conditioning, but not delay conditioning, and what do the exceptions reveal? Why do amygdala lesions made before or immediately after training decelerate conditioning while those made later do not? Why do thalamic or sensory cortical lesions degrade trace conditioning more than delay conditioning? Why do hippocampal lesions during trace conditioning experiments degrade recent but not temporally remote learning? Why do orbitofrontal cortical lesions degrade temporally remote but not recent or post-lesion learning? How is temporally graded amnesia caused by ablation of prefrontal cortex after memory consolidation? How are attention and consciousness linked during conditioning? How do neurotrophins, notably brain-derived neurotrophic factor (BDNF), influence memory formation and consolidation? Is there a common output path for learned performance? A neural model proposes a unified answer to these questions that overcome problems of alternative memory models...
November 30, 2016: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/27902832/association-of-irritability-and-anxiety-with-the-neural-mechanisms-of-implicit-face-emotion-processing-in-youths-with-psychopathology
#3
Joel Stoddard, Wan-Ling Tseng, Pilyoung Kim, Gang Chen, Jennifer Yi, Laura Donahue, Melissa A Brotman, Kenneth E Towbin, Daniel S Pine, Ellen Leibenluft
Importance: Psychiatric comorbidity complicates clinical care and confounds efforts to elucidate the pathophysiology of commonly occurring symptoms in youths. To our knowledge, few studies have simultaneously assessed the effect of 2 continuously distributed traits on brain-behavior relationships in children with psychopathology. Objective: To determine shared and unique effects of 2 major dimensions of child psychopathology, irritability and anxiety, on neural responses to facial emotions during functional magnetic resonance imaging...
November 30, 2016: JAMA Psychiatry
https://www.readbyqxmd.com/read/27900929/main-effects-and-interactions-of-cerebral-hemispheres-gender-and-age-in-the-calculation-of-volumes-and-asymmetries-of-selected-structures-of-episodic-memory
#4
Rocio Ramirez-Carmona, Haydee Guadalupe Garcia-Lazaro, Brenda Dominguez-Corrales, Erika Aguilar-Castañeda, Ernesto Roldan-Valadez
The aim of this study was to clarify the influence of anatomical (cerebral hemisphere) and demographic (age and gender) variables on the gray matter (GM) volumes and volumetric asymmetry indices (VAIs) of selected structures involved in episodic memory. A cross-sectional study was performed in 47 healthy volunteers. Neuropsychological evaluation revealed similar IQs across the sample. Using SPM-based software, brain segmentation, labeling and volume measurements of the hippocampus, amygdala, middle temporal gyrus and parahippocampal gyrus were performed in each cerebral hemisphere...
November 30, 2016: Functional Neurology
https://www.readbyqxmd.com/read/27893434/neuroinflammatory-and-cognitive-consequences-of-combined-radiation-and-immunotherapy-in-a-novel-preclinical-model
#5
Gwendolyn J McGinnis, David Friedman, Kristina H Young, Eileen Ruth S Torres, Charles R Thomas, Michael J Gough, Jacob Raber
BACKGROUND: Cancer patients often report behavioral and cognitive changes following cancer treatment. These effects can be seen in patients who have not yet received treatment or have received only peripheral (non-brain) irradiation. Novel treatments combining radiotherapy (RT) and immunotherapy (IT) demonstrate remarkable efficacy with respect to tumor outcomes by enhancing the proinflammatory environment in the tumor. However, a proinflammatory environment in the brain mediates cognitive impairments in other neurological disorders and may affect brain function in cancer patients receiving these novel treatments...
November 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/27891086/circuits-regulating-pleasure-and-happiness-mechanisms-of-depression
#6
Anton J M Loonen, Svetlana A Ivanova
According to our model of the regulation of appetitive-searching vs. distress-avoiding behaviors, the motivation to display these essential conducts is regulated by two parallel cortico-striato-thalamo-cortical, re-entry circuits, including the core and the shell parts of the nucleus accumbens, respectively. An entire series of basal ganglia, running from the caudate nucleus on one side, to the centromedial amygdala on the other side, controls the intensity of these reward-seeking and misery-fleeing behaviors by stimulating the activity of the (pre)frontal and limbic cortices...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27888284/attenuation-of-the-anxiogenic-effects-of-cocaine-by-5-ht1b-autoreceptor-stimulation-in-the-bed-nucleus-of-the-stria-terminalis-of-rats
#7
Adam K Klein, Michael A Brito, Sayeh Akhavan, Dylan R Flanagan, Nikki Le, Tatum Ohana, Anand S Patil, Erin M Purvis, Carl Provenzano, Alex Wei, Lucy Zhou, Aaron Ettenberg
RATIONALE: Cocaine produces significant aversive/anxiogenic actions whose underlying neurobiology remains unclear. A possible substrate contributing to these actions is the serotonergic (5-HT) pathway projecting from the dorsal raphé (DRN) to regions of the extended amygdala, including the bed nucleus of the stria terminalis (BNST) which have been implicated in the production of anxiogenic states. OBJECTIVES: The present study examined the contribution of 5-HT signaling within the BNST to the anxiogenic effects of cocaine as measured in a runway model of drug self-administration...
November 25, 2016: Psychopharmacology
https://www.readbyqxmd.com/read/27888020/neural-correlates-of-affective-empathy-and-reinforcement-learning-in-boys-with-conduct-problems-fmri-evidence-from-a-gambling-task
#8
Christina Schwenck, Angela Ciaramidaro, Marina Selivanova, Jennifer Tournay, Christine M Freitag, Michael Siniatchkin
BACKGROUND: Conduct problems (CP) comprise abnormal behaviors associated with aberrant aspects of affective empathy as well as learning. However, behavioral measures for affective empathy are challenging, and previous results concerning learning in patients with CP are inconsistent. METHODS: Nineteen boys with CP and 24 typically developing (TD) boys aged 11-17 years (M=14.34, SD=1.93) participated in the study. An ultimatum-game was applied in order to elicit the feeling of like or dislike towards the opponent for a subsequent gambling task, which was played by the opponents (OTHER-condition) and by the participants themselves (SELF-condition)...
November 22, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27878209/preclinical-models-of-overwhelming-sepsis-implicate-the-neural-system-that-encodes-contextual-fear-memory
#9
Patricio T Huerta, Sergio Robbiati, Tomás Salvador Huerta, Anchal Sabharwal, Rose A Berlin, Maya Frankfurt, Bruce T Volpe
Long-term sepsis survivors sustain cryptic brain injury that leads to cognitive impairment, emotional imbalance, and increased disability burden. Suitable animal models of sepsis, such as cecal ligation and puncture (CLP), have permitted the analysis of abnormal brain circuits that underlie post-septic behavioral phenotypes. For instance, we have previously shown that CLP-exposed mice exhibit impaired spatial memory together with depleted dendritic arbors and decreased spines in the apical dendrites of pyramidal neurons in the CA1 region of the hippocampus...
November 17, 2016: Molecular Medicine
https://www.readbyqxmd.com/read/27876866/developmental-disruption-of-perineuronal-nets-in-the-medial-prefrontal-cortex-after-maternal-immune-activation
#10
John W Paylor, Brittney R Lins, Quentin Greba, Nicholas Moen, Reiner Silveira de Moraes, John G Howland, Ian R Winship
Maternal infection during pregnancy increases the risk of offspring developing schizophrenia later in life. Similarly, animal models of maternal immune activation (MIA) induce behavioural and anatomical disturbances consistent with a schizophrenia-like phenotype in offspring. Notably, cognitive impairments in tasks dependent on the prefrontal cortex (PFC) are observed in humans with schizophrenia and in offspring after MIA during pregnancy. Recent studies of post-mortem tissue from individuals with schizophrenia revealed deficits in extracellular matrix structures called perineuronal nets (PNNs), particularly in PFC...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27876790/stress-induces-a-shift-towards-striatum-dependent-stimulus-response-learning-via-the-mineralocorticoid-receptor
#11
Susanne Vogel, Floris Klumpers, Tobias Navarro Schröder, Krista T Oplaat, Harm J Krugers, Melly S Oitzl, Marian Joëls, Christian F Doeller, Guillén Fernández
Stress is assumed to cause a shift from flexible 'cognitive' memory to more rigid 'habit' memory. In the spatial memory domain, stress impairs place learning depending on the hippocampus whereas stimulus-response learning based on the striatum appears to be improved. While the neural basis of this shift is still unclear, previous evidence in rodents points towards cortisol interacting with the mineralocorticoid receptor (MR) to affect amygdala functioning. The amygdala is in turn assumed to orchestrate the stress-induced shift in memory processing...
November 23, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27876655/dorsal-root-ganglion-stimulation-attenuates-the-bold-signal-response-to-noxious-sensory-input-in-specific-brain-regions-insights-into-a-possible-mechanism-for-analgesia
#12
Christopher P Pawela, Jeffery M Kramer, Quinn H Hogan
Targeted dorsal root ganglion (DRG) electrical stimulation (i.e. ganglionic field stimulation - GFS) is an emerging therapeutic approach to alleviate chronic pain. Here we describe blood oxygen-level dependent (BOLD) functional magnetic resonance imaging (fMRI) responses to noxious hind-limb stimulation in a rat model that replicates clinical GFS using an electrode implanted adjacent to the DRG. Acute noxious sensory stimulation in the absence of GFS caused robust BOLD fMRI response in brain regions previously associated with sensory and pain-related response, such as primary/secondary somatosensory cortex, retrosplenial granular cortex, thalamus, caudate putamen, nucleus accumbens, globus pallidus, and amygdala...
November 19, 2016: NeuroImage
https://www.readbyqxmd.com/read/27874048/inverse-changes-in-l1-retrotransposons-between-blood-and-brain-in-major-depressive-disorder
#13
Shu Liu, Tingfu Du, Zeyue Liu, Yan Shen, Jianbo Xiu, Qi Xu
Long interspersed nuclear element-1 (LINE-1 or L1) is a type of retrotransposons comprising 17% of the human and mouse genome, and has been found to be associated with several types of neurological disorders. Previous post-mortem brain studies reveal increased L1 copy number in the prefrontal cortex from schizophrenia patients. However, whether L1 retrotransposition occurs similarly in major depressive disorder (MDD) is unknown. Here, L1 copy number was measured by quantitative PCR analysis in peripheral blood of MDD patients (n = 105) and healthy controls (n = 105)...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27871027/trauma-exposure-relates-to-heightened-stress-altered-amygdala-morphology-and-deficient-extinction-learning-implications-for-psychopathology
#14
Raffaele Cacciaglia, Frauke Nees, Oliver Grimm, Stephanie Ridder, Sebastian T Pohlack, Slawomira J Diener, Claudia Liebscher, Herta Flor
Stress exposure causes a structural reorganization in neurons of the amygdala. In particular, animal models have repeatedly shown that both acute and chronic stress induce neuronal hypertrophy and volumetric increase in the lateral and basolateral nuclei of amygdala. These effects are visible on the behavioral level, where stress enhances anxiety behaviors and provokes greater fear learning. We assessed stress and anxiety levels in a group of 18 healthy human trauma-exposed individuals (TR group) compared to 18 non-exposed matched controls (HC group), and related these measurements to amygdala volume...
November 11, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27870942/altered-time-course-of-amygdala-activation-during-speech-anticipation-in-social-anxiety-disorder
#15
Carolyn D Davies, Katherine Young, Jared B Torre, Lisa J Burklund, Philippe R Goldin, Lily A Brown, Andrea N Niles, Matthew D Lieberman, Michelle G Craske
BACKGROUND: Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). METHOD: Participants (SAD n=58; HC n=16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task...
November 16, 2016: Journal of Affective Disorders
https://www.readbyqxmd.com/read/27868085/child-trauma-exposure-and-psychopathology-mechanisms-of-risk-and-resilience
#16
Katie A McLaughlin, Hilary K Lambert
Exposure to trauma in childhood is associated with elevated risk for multiple forms of psychopathology. Here we present a biopsychosocial model outlining the mechanisms that link child trauma with psychopathology and protective factors that can mitigate these risk pathways. We focus on four mechanisms of enhanced threat processing: information processing biases that facilitate rapid identification of environmental threats, disruptions in learning mechanisms underlying the acquisition of fear, heightened emotional responses to potential threats, and difficulty disengaging from negative emotional content...
April 2017: Current Opinion in Psychology
https://www.readbyqxmd.com/read/27867834/neurobiology-of-risk-for-bipolar-disorder
#17
REVIEW
Ayşegül Özerdem, Deniz Ceylan, Güneş Can
Bipolar disorder (BD) is a chronic mental illness which follows a relapsing and remitting course and requires lifetime treatment. The lack of biological markers for BD is a major difficulty in clinical practice. Exploring multiple endophenotypes to fit in multivariate genetic models for BD is an important element in the process of finding tools to facilitate early diagnosis, early intervention, prevention of new episodes, and follow-up of treatment response in BD. Reviewing of studies on neuroimaging, neurocognition, and biochemical parameters in populations with high genetic risk for the illness can yield an integrative perspective on the neurobiology of risk for BD...
2016: Current Treatment Options in Psychiatry
https://www.readbyqxmd.com/read/27856160/anti-excitotoxic-effects-of-cannabidiol-are-partly-mediated-by-enhancement-of-ncx2-and-ncx3-expression-in-animal-model-of-cerebral-ischemia
#18
Sepideh Khaksar, Mohammad Reza Bigdeli
Excitotoxicity and imbalance of sodium and calcium homeostasis trigger pathophysiologic processes in cerebral ischemia which can accelerate neuronal death. Neuroprotective role of cannabidiol (CBD), one of the main non-psychoactive phytocannabinoids of the cannabis plant, has attracted attention of many researchers in the neurodegenerative diseases studies. The present investigation was designed to determine whether cannabidiol can alleviate the severity of ischemic damages and if it is able to exert its anti-excitotoxic effects through sodium and calcium regulation...
November 14, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27851909/systemic-cisplatin-exposure-during-infancy-and-adolescence-causes-impaired-cognitive-function-in-adulthood
#19
Tami John, Naomi Lomeli, Daniela A Bota
Cancer survivors diagnosed during infancy and adolescence may be at risk for chemotherapy-related cognitive impairments (CRCI), however the effects of pediatric chemotherapy treatment on adulthood cognitive function are not well understood. Impairments in memory, attention and executive function affect 15-50% of childhood leukemia survivors related to methotrexate exposure. Systemic cisplatin is used to treat a variety of childhood and adult cancers, yet the risk and extent of cognitive impairment due to platinum-based chemotherapy in pediatric patients is unknown...
November 13, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27845329/hyperconnectivity-of-prefrontal-cortex-to-amygdala-projections-in-a-mouse-model-of-macrocephaly-autism-syndrome
#20
Wen-Chin Huang, Youjun Chen, Damon T Page
Multiple autism risk genes converge on the regulation of mTOR signalling, which is a key effector of neuronal growth and connectivity. We show that mTOR signalling is dysregulated during early postnatal development in the cerebral cortex of germ-line heterozygous Pten mutant mice (Pten(+/-)), which model macrocephaly/autism syndrome. The basolateral amygdala (BLA) receives input from subcortical-projecting neurons in the medial prefrontal cortex (mPFC). Analysis of mPFC to BLA axonal projections reveals that Pten(+/-) mice exhibit increased axonal branching and connectivity, which is accompanied by increased activity in the BLA in response to social stimuli and social behavioural deficits...
November 15, 2016: Nature Communications
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