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https://www.readbyqxmd.com/read/29154809/facilitated-acquisition-of-the-classically-conditioned-eyeblink-response-in-active-duty-military-expressing-posttraumatic-stress-disorder-symptoms
#1
Justin D Handy, Pelin Avcu, Nora Ko, Alejandro Ortiz, Michael J Doria, Richard J Servatius
OBJECTIVE: Learning diathesis models underscore the role of hyper-conditioning in the development of PTSD following trauma exposure. Eyeblink classical conditioning is one method of examining associative learning biases independent of fear and threat produced by trauma. Facilitated learning is apparent in individuals self-expressing PTSD symptoms, as well as behaviorally inhibited (BI) temperament, a vulnerability factor for PTSD. Here, we examine eyeblink conditioning in active duty military personnel and relate learning with PTSD symptomology...
November 14, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29152674/progress-and-promise-for-the-mdma-drug-development-program
#2
REVIEW
Allison A Feduccia, Julie Holland, Michael C Mithoefer
Pharmacotherapy is often used to target symptoms of posttraumatic stress disorder (PTSD), but does not provide definitive treatment, and side effects of daily medication are often problematic. Trauma-focused psychotherapies are more likely than drug treatment to achieve PTSD remission, but have high dropout rates and ineffective for a large percentage of patients. Therefore, research into drugs that might increase the effectiveness of psychotherapy is a logical avenue of investigation. The most promising drug studied as a catalyst to psychotherapy for PTSD thus far is 3,4-methylenedioxymethamphetamine (MDMA), commonly known as the recreational drug "Ecstasy...
November 20, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/29152417/assessing-mongolian-gerbil-emotional-behavior-effects-of-two-shock-intensities-and-response-independent-shocks-during-an-extended-inhibitory-avoidance-task
#3
Camilo Hurtado-Parrado, Camilo González-León, Mónica A Arias-Higuera, Angelo Cardona, Lucia G Medina, Laura García-Muñoz, Christian Sánchez, Julián Cifuentes, Juan Carlos Forigua, Andrea Ortiz, Cesar A Acevedo-Triana, Javier L Rico
Despite step-down inhibitory avoidance procedures that have been widely implemented in rats and mice to study learning and emotion phenomena, performance of other species in these tasks has received less attention. The case of the Mongolian gerbil is of relevance considering the discrepancies in the parameters of the step-down protocols implemented, especially the wide range of foot-shock intensities (i.e., 0.4-4.0 mA), and the lack of information on long-term performance, extinction effects, and behavioral patterning during these tasks...
2017: PeerJ
https://www.readbyqxmd.com/read/29142058/juvenile-female-rats-but-not-male-rats-show-renewal-reinstatement-and-spontaneous-recovery-following-extinction-of-conditioned-fear
#4
Chun Hui J Park, Despina E Ganella, Jee Hyun Kim
Anxiety disorders emerge early, and girls are significantly more likely to develop anxiety compared to boys. However, sex differences in fear during development are poorly understood. Therefore, we investigated juvenile male and female rats in the relapse behaviors following extinction of conditioned fear. In all experiments, 18-d-old rats first received three white-noise-footshock pairings on day 1. On day 2, extinction involved 60 white-noise alone trials. In experiment 1, we examined renewal by testing the rats in either the same or different context as extinction on day 3...
December 2017: Learning & Memory
https://www.readbyqxmd.com/read/29136108/perturbation-of-gabaergic-synapses-at-the-axon-initial-segment-of-basolateral-amygdala-induces-trans-regional-metaplasticity-at-the-medial-prefrontal-cortex
#5
Rinki Saha, Kuldeep Shrivastava, Liang Jing, Rachel Schayek, Mouna Maroun, Martin Kriebel, Hansjürgen Volkmer, Gal Richter-Levin
GABAergic synapses in the basolateral amygdala (BLA) play an important role in fear memory generation. We have previously reported that reduction in GABAergic synapses innervating specifically at the axon initial segment (AIS) of principal neurons of BLA, by neurofascin (NF) knockdown, impairs fear extinction. BLA is bidirectionally connected with the medial prefrontal cortex (mPFC), which is a key region involved in extinction of acquired fear memory. Here, we showed that reducing AIS GABAergic synapses within the BLA leads to impairment of synaptic plasticity in the BLA-mPFC pathway, as well as in the ventral subiculum (vSub)-mPFC pathway, which is independent of BLA involvement...
November 9, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29136107/contextual-fear-extinction-induces-hippocampal-metaplasticity-mediated-by-metabotropic-glutamate-receptor-5
#6
Branden J Stansley, Nicole M Fisher, Rocco G Gogliotti, Craig W Lindsley, P Jeffrey Conn, Colleen M Niswender
Dysregulated fear memory can lead to a broad spectrum of anxiety disorders. The brain systems underlying fear memory are manifold, with the hippocampus being prominently involved by housing fear-related spatial memories as engrams, which are created and stored through neural changes such as synaptic plasticity. Although metabotropic glutamate (mGlu) receptors contribute significantly to both fear behavior and hippocampal synaptic plasticity, the relationship between these two phenomena has not been fully elucidated...
November 9, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29100629/metabotropic-glutamatergic-receptor-5-and-stress-disorders-knowledge-gained-from-receptor-imaging-studies
#7
REVIEW
Irina Esterlis, Sophie E Holmes, Priya Sharma, John H Krystal, Christine DeLorenzo
The metabotropic glutamatergic receptor subtype 5 (mGluR5) may represent a promising therapeutic target for stress-related psychiatric disorders. Here, we describe mGluR5 findings in stress disorders, particularly major depressive disorder (MDD), highlighting insights from positron emission tomography studies. Positron emission tomography studies report either no differences or lower mGluR5 in MDD, potentially reflecting MDD heterogeneity. Unlike the rapidly acting glutamatergic agent ketamine, mGluR5-specific modulation has not yet shown antidepressant efficacy in MDD and bipolar disorder...
September 19, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/29080589/core-mechanisms-of-cognitive-behavioral-therapy-for-anxiety-and-depression-a-review
#8
REVIEW
Mark B Powers, Rianne A de Kleine, Jasper A J Smits
This article reviews the extant literature on mediators of change in cognitive behavioral therapy (CBT) for anxiety and depression. The authors briefly discuss the efficacy of CBT for anxiety and depression and methods of mediation analysis and detection. Then the authors discuss fear extinction in anxiety treatment and cognitive change in depression treatment.
December 2017: Psychiatric Clinics of North America
https://www.readbyqxmd.com/read/29080588/basic-strategies-of-cognitive-behavioral-therapy
#9
REVIEW
Amy Wenzel
Cognitive behavioral therapy's main strategies are active, problem-focused, and collaborative. Cognitive restructuring is a strategy in which clinicians help patients to identify, evaluate, and modify inaccurate or otherwise unhelpful thinking associated with emotional distress. Behavioral activation provides a framework for patients, particularly those who are depressed, to increase engagement in activities that provide a sense of accomplishment or pleasure. The goal of exposure is for anxious patients to experience an extinction of fear by having planned contact with feared stimuli and situations...
December 2017: Psychiatric Clinics of North America
https://www.readbyqxmd.com/read/29079689/basolateral-amygdala-neurons-maintain-aversive-emotional-salience
#10
Auntora Sengupta, Joanna O Y Yau, Philip Jean-Richard Dit Bressel, Yu Liu, Zayra E Millan, John M Power, Gavan P McNally
Basolateral amygdala (BLA) neurons serve a well-accepted role in fear conditioning and fear extinction. However, the specific learning processes related to their activity at different times during learning remain poorly understood. We addressed this using behavioral tasks isolating distinct aspects of fear learning in male rats. We show that brief optogenetic inhibition of BLA neurons around moments of aversive reinforcement or non-reinforcement causes reductions in the salience of conditioned stimuli, rendering these stimuli less able to be learned about and less able to control fear or safety behaviours...
October 27, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29079442/effects-of-systemic-estradiol-on-fear-extinction-in-female-rats-are-dependent-on-interactions-between-dose-estrous-phase-and-endogenous-estradiol-levels
#11
Bronwyn M Graham, Elliot Scott
Administering estradiol to females during periods of low endogenous estradiol enhances their ability to extinguish fear, the laboratory basis of exposure therapy for anxiety disorders. It has therefore been proposed that estradiol could be a useful adjunct to enhance exposure therapy outcomes. The present study aimed to clarify the boundary conditions under which estradiol could be used for this purpose, by assessing whether the impact of estradiol, administered systemically prior to extinction training, differs depending on dose and estrous phase in adult female rats...
November 8, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/29061703/baseline-levels-of-rapid-eye-movement-sleep-may-protect-against-excessive-activity-in-fear-related-neural-circuitry
#12
Itamar Lerner, Shira M Lupkin, Neha Sinha, Alan Tsai, Mark A Gluck
Sleep, and particularly rapid-eye movement sleep (REM), has been implicated in the modulation of neural activity following fear conditioning and extinction in both human and animal studies. It has long been presumed that such effects play a role in the formation and persistence of Post-Traumatic-Stress-disorder, of which sleep impairments are a core feature. However, to date, few studies have thoroughly examined the potential effects of sleep prior to conditioning on subsequent acquisition of fear learning in humans...
October 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29038219/the-l-type-voltage-gated-calcium-channel-cav1-2-mediates-fear-extinction-and-modulates-synaptic-tone-in-the-lateral-amygdala
#13
Stephanie J Temme, Geoffrey G Murphy
L-type voltage-gated calcium channels (LVGCCs) have been implicated in both the formation and the reduction of fear through Pavlovian fear conditioning and extinction. Despite the implication of LVGCCs in fear learning and extinction, studies of the individual LVGCC subtypes, CaV1.2 and CaV1.3, using transgenic mice have failed to find a role of either subtype in fear extinction. This discontinuity between the pharmacological studies of LVGCCs and the studies investigating individual subtype contributions could be due to the limited neuronal deletion pattern of the CaV1...
November 2017: Learning & Memory
https://www.readbyqxmd.com/read/29030297/impaired-extinction-of-cued-fear-memory-and-abnormal-dendritic-morphology-in-the-prelimbic-and-infralimbic-cortices-in-vpac2-receptor-vipr2-deficient-mice
#14
Yukio Ago, Atsuko Hayata-Takano, Takuya Kawanai, Ryosuke Yamauchi, Shuto Takeuchi, Jesse D Cushman, Abha K Rajbhandari, Michael S Fanselow, Hitoshi Hashimoto, James A Waschek
The structurally related neuropeptides vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) have been implicated in stress regulation and learning and memory. Several bodies of research have shown the impact of the PACAP specific receptor PAC1 on fear memory, but the roles of other PACAP receptors in regulating fear stress responses remain to be elucidated. Here we aimed to investigate the effects of genetic deletion of VIPR2 encoding the VPAC2 receptor, which binds both VIP and PACAP, on fear-related memory and on dendritic morphology in the brain regions of the fear circuitry...
November 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29028150/potential-of-micrornas-as-novel-targets-in-the-alleviation-of-pathological-fear
#15
REVIEW
Conor P Murphy, Nicolas Singewald
The current treatment of post-traumatic stress disorder (PTSD), phobias and other anxiety disorders, remains insufficient particularly in producing long-lasting full symptom control. Dysfunctional fear processing is common in these disorders, including a deficiency in fear-inhibitory mechanisms and impairment in the ability to discriminate between safety and danger cues. Research has aimed to elucidate brain circuitries, neurotransmitters and downstream signaling pathways important in the alleviation of aberrant fear, with a specific focus on mechanisms modulating fear memory and its behavioral expression...
October 13, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/29025687/serine-racemase-and-d-serine-in-the-amygdala-are-dynamically-involved-in-fear-learning
#16
Darrick T Balu, Kendall Taylor Presti, Cathy C Y Huang, Kevin Muszynski, Inna Radzishevsky, Herman Wolosker, Guia Guffanti, Kerry J Ressler, Joseph T Coyle
BACKGROUND: The amygdala is a central component of the neural circuitry that underlies fear learning. N-methyl-D-aspartate receptor-dependent plasticity in the amygdala is required for pavlovian fear conditioning and extinction. N-methyl-D-aspartate receptor activation requires the binding of a coagonist, D-serine, which is synthesized from L-serine by the neuronal enzyme serine racemase (SR). However, little is known about SR and D-serine function in the amygdala. METHODS: We used immunohistochemical methods to characterize the cellular localization of SR and D-serine in the mouse and human amygdala...
August 26, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/29018384/attentional-control-and-fear-extinction-in-subclinical-fear-an-exploratory-study
#17
Eduard Forcadell, David Torrents-Rodas, Devi Treen, Miquel A Fullana, Miquel Tortella-Feliu
Attentional control (AC) and fear extinction learning are known to be involved in pathological anxiety. In this study we explored whether individual differences in non-emotional AC were associated with individual differences in the magnitude and gradient of fear extinction (learning and recall). In 50 individuals with fear of spiders, we collected measures of non-emotional AC by means of self-report and by assessing the functioning of the major attention networks (executive control, orienting, and alerting)...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29017931/acute-nicotine-disrupts-consolidation-of-contextual-fear-extinction-and-alters-long-term-memory-associated-hippocampal-kinase-activity
#18
Munir Gunes Kutlu, Brendan Garrett, Sana Gadiwalla, Jessica M Tumolo, Thomas J Gould
Previous research has shown that acute nicotine, an agonist of nAChRs, impaired fear extinction. However, the effects of acute nicotine on consolidation of contextual fear extinction memories and associated cell signaling cascades are unknown. Therefore, we examined the effects of acute nicotine injections before (pre-extinction) and after (post-extinction) contextual fear extinction on behavior and the phosphorylation of dorsal and ventral hippocampal ERK1/2 and JNK1 and protein levels on the 1st and 3rd day of extinction...
November 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29017388/pathophysiological-bases-of-comorbidity-traumatic-brain-injury-and-post-traumatic-stress-disorder
#19
Gary B Kaplan, Kimberly A Leite-Morris, Lei Wang, Kendra K Rumbika, Stephen C Heinrichs, Xiang Zeng, Liquan Wu, Danielle T Arena, Yang D Teng
The high rates of traumatic brain injury (TBI) and post-traumatic stress disorder (PTSD) diagnoses encountered in recent years by the United States Veterans Affairs Healthcare System have increased public awareness and research investigation into these conditions. In this review, we analyze the neural mechanisms underlying the TBI/PTSD comorbidity. TBI and PTSD present with common neuropsychiatric symptoms including anxiety, irritability, insomnia, personality changes, and memory problems, and this overlap complicates diagnostic differentiation...
November 3, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28993816/psychological-and-psychobiological-responses-to-immediate-early-intervention-in-the-emergency-department-case-report-of-one-session-exposure-therapy-for-the-prevention-of-ptsd
#20
Loren M Post, Vasiliki Michopoulos, Jennifer S Stevens, Renuka Reddy, Jessica L Maples, Jessica R Morgan, Alex O Rothbaum, Tanja Jovanovic, Kerry J Ressler, Barbara O Rothbaum
Research suggests that exposure therapy provided in the hours immediately following trauma exposure may prevent PTSD development. This case report presents data on an at-risk for PTSD participant involved in a motor-vehicle crash that caused her severe distress. She received one session of exposure therapy in the emergency department (ED) as part of an ongoing randomized controlled study examining the optimal dose of exposure therapy in the immediate aftermath of trauma. PTSD and depression measures were collected at pre-treatment assessment and one- and three-month follow-up...
2017: Practice Innovations (Washington, D.C.)
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