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Memory extinction

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https://www.readbyqxmd.com/read/28540927/regional-differences-in-striatal-neuronal-ensemble-excitability-following-cocaine-and-extinction-memory-retrieval-in-fos-gfp-mice
#1
Joseph Ziminski, Meike C Sieburg, Gabriella Margetts-Smith, Hans S Crombag, Eisuke Koya
Learned associations between drugs of abuse and the drug administration environment play an important role in addiction. In rodents, exposure to a drug-associated environment elicits conditioned psychomotor activation, which may be weakened following extinction learning. While widespread drug-induced changes in neuronal excitability have been observed, little is known about specific changes within neuronal ensembles activated during the recall of drug-environment associations. Using a cocaine conditioned locomotion procedure, the present study assessed the excitability of neuronal ensembles in the nucleus accumbens core and shell (NAc(core) and NAc(shell)), and dorsal striatum (DS) following cocaine conditioning and extinction in Fos-GFP mice that express green fluorescent protein (GFP) in activated neurons (GFP+)...
May 25, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28534459/differences-in-neural-response-to-extinction-recall-in-young-adults-with-or-without-history-of-behavioral-inhibition
#2
Tomer Shechner, Nathan A Fox, Jamie A Mash, Johanna M Jarcho, Gang Chen, Ellen Leibenluft, Daniel S Pine, Jennifer C Britton
Behavioral inhibition (BI) is a temperament identified in early childhood that is associated with risk for anxiety disorders, yet only about half of behaviorally inhibited children manifest anxiety later in life. We compared brain function and behavior during extinction recall in a sample of nonanxious young adults characterized in childhood with BI (n = 22) or with no BI (n = 28). Three weeks after undergoing fear conditioning and extinction, participants completed a functional magnetic resonance imaging extinction recall task assessing memory and threat differentiation for conditioned stimuli...
May 23, 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28523223/transcranial-direct-current-stimulation-may-modulate-extinction-memory-in-posttraumatic-stress-disorder
#3
Mascha Van't Wout, Sharon M Longo, Madhavi K Reddy, Noah S Philip, Marguerite T Bowker, Benjamin D Greenberg
BACKGROUND: Abnormalities in fear extinction and recall are core components of posttraumatic stress disorder (PTSD). Data from animal and human studies point to a role of the ventromedial prefrontal cortex (vmPFC) in extinction learning and subsequent retention of extinction memories. Given the increasing interest in developing noninvasive brain stimulation protocols for psychopathology treatment, we piloted whether transcranial direct current stimulation (tDCS) during extinction learning, vs...
May 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28521127/synaptic-plasticity-engrams-and-network-oscillations-in-amygdala-circuits-for-storage-and-retrieval-of-emotional-memories
#4
REVIEW
Marco Bocchio, Sadegh Nabavi, Marco Capogna
The neuronal circuits of the basolateral amygdala (BLA) are crucial for acquisition, consolidation, retrieval, and extinction of associative emotional memories. Synaptic plasticity in BLA neurons is essential for associative emotional learning and is a candidate mechanism through which subsets of BLA neurons (commonly termed "engram") are recruited during learning and reactivated during memory retrieval. In parallel, synchronous oscillations in the theta and gamma bands between the BLA and interconnected structures have been shown to occur during consolidation and retrieval of emotional memories...
May 17, 2017: Neuron
https://www.readbyqxmd.com/read/28507513/appetitive-olfactory-learning-and-long-term-associative-memory-in-caenorhabditis-elegans
#5
Saori Nishijima, Ichiro N Maruyama
Because of the relative simplicity of its nervous system, Caenorhabditis elegans is a useful model organism to study learning and memory at cellular and molecular levels. For appetitive conditioning in C. elegans, food has exclusively been used as an unconditioned stimulus (US). It may be difficult to analyze neuronal circuits for associative memory since food is a multimodal combination of olfactory, gustatory, and mechanical stimuli. Here, we report classical appetitive conditioning and associative memory in C...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28507033/response-specific-sex-difference-in-the-retention-of-fear-extinction
#6
Meagan E Voulo, Ryan G Parsons
Fear conditioning studies in rodents allow us to assess vulnerability factors which might underlie fear-based psychopathology such as post-traumatic stress disorder (PTSD). Despite PTSD being more prevalent in females than males, very few fear conditioning studies in rodents have tested females. Our study assessed fear conditioning and extinction in male and female rats using both fear-potentiated startle and freezing behavior as measures. Rats were trained to fear cues that predicted the occurrence of shock and then subsequently exposed to an extinction training procedure where the cue was presented repeatedly in the absence of shock...
June 2017: Learning & Memory
https://www.readbyqxmd.com/read/28498605/brain-structural-connectivity-and-context-dependent-extinction-memory
#7
Andrea Hermann, Rudolf Stark, Carlo R Blecker, Mohammed R Milad, Christian J Merz
BACKGROUND: Extinction of conditioned fear represents an important mechanism in the treatment of anxiety disorders. Return of fear after successful extinction or exposure therapy in patients with anxiety disorders might be linked to poor temporal or contextual generalization of extinction due to individual differences in brain structural connectivity. The goal of this magnetic resonance imaging study was therefore to investigate the association of context-dependent extinction recall with brain structural connectivity...
May 12, 2017: Hippocampus
https://www.readbyqxmd.com/read/28491027/post-learning-sleep-transiently-boosts-context-specific-operant-extinction-memory
#8
Margarita Borquez, María P Contreras, Ennio Vivaldi, Jan Born, Marion Inostroza
Operant extinction is learning to supress a previously rewarded behavior. It is known to be strongly associated with the specific context in which it was acquired, which limits the therapeutic use of operant extinction in behavioral treatments, e.g., of addiction. We examined whether sleep influences contextual memory of operant extinction over time, using two different recall tests (Recent and Remote). Rats were trained in an operant conditioning task (lever press) in context A, then underwent extinction training in context B, followed by a 3-h retention period that contained either spontaneous morning sleep, morning sleep deprivation, or spontaneous evening wakefulness...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28491025/change-of-rin1-and-stathmin-in-the-animal-model-of-traumatic-stresses
#9
Fang Han, Jingzhi Jiang, Jinlan Ding, Hong Liu, Bing Xiao, Yuxiu Shi
The molecular mechanism of fear memory is poorly understood. Therefore, the pathogenesis of post-traumatic stress disorder (PTSD), whose symptom presentation can enhance fear memory, remains largely unclear. Recent studies with knockout animals have reported that Rin1 and stathmin regulate fear memory. Rin1 inhibits acquisition and promotes memory extinction, whereas stathmin regulates innate and basal fear. The aim of our study was to examine changes in the expression of Rin1 and stathmin in different animal models of stress, particluarly traumatic stress...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28489272/fear-learning-alterations-after-traumatic-brain-injury-and-their-role-in-development-of-posttraumatic-stress-symptoms
#10
Daniel E Glenn, Dean T Acheson, Mark A Geyer, Caroline M Nievergelt, Dewleen G Baker, Victoria B Risbrough
BACKGROUND: It is unknown how traumatic brain injury (TBI) increases risk for posttraumatic stress disorder (PTSD). One potential mechanism is via alteration of fear-learning processes that could affect responses to trauma memories and cues. We utilized a prospective, longitudinal design to determine if TBI is associated with altered fear learning and extinction, and if fear processing mediates effects of TBI on PTSD symptom change. METHODS: Eight hundred fifty two active-duty Marines and Navy Corpsmen were assessed before and after deployment...
May 10, 2017: Depression and Anxiety
https://www.readbyqxmd.com/read/28474470/modulation-of-7%C3%A2-t-fmri-signal-in-the-cerebellar-cortex-and-nuclei-during-acquisition-extinction-and-reacquisition-of-conditioned-eyeblink-responses
#11
Thomas M Ernst, Markus Thürling, Sarah Müller, Fabian Kahl, Stefan Maderwald, Marc Schlamann, Henk-Jan Boele, Sebastiaan K E Koekkoek, Jörn Diedrichsen, Chris I De Zeeuw, Mark E Ladd, Dagmar Timmann
Classical delay eyeblink conditioning is likely the most commonly used paradigm to study cerebellar learning. As yet, few studies have focused on extinction and savings of conditioned eyeblink responses (CRs). Saving effects, which are reflected in a reacquisition after extinction that is faster than the initial acquisition, suggest that learned associations are at least partly preserved during extinction. In this study, we tested the hypothesis that acquisition-related plasticity is nihilated during extinction in the cerebellar cortex, but retained in the cerebellar nuclei, allowing for faster reacquisition...
May 5, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28469565/in-search-for-boundary-conditions-of-reconsolidation-a-failure-of-fear-memory-interference
#12
Natalie Schroyens, Tom Beckers, Merel Kindt
The presentation of a fear memory cue can result in mere memory retrieval, destabilization of the reactivated memory trace, or the formation of an extinction memory. The interaction between the degree of novelty during reactivation and previous learning conditions is thought to determine the outcome of a reactivation session. This study aimed to evaluate whether contextual novelty can prevent cue-induced destabilization and disruption of a fear memory acquired by non-asymptotic learning. To this end, fear memory was reactivated in a novel context or in the original context of learning, and fear memory reactivation was followed by the administration of propranolol, an amnestic drug...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28464461/neural-circuits-involved-in-the-renewal-of-extinguished-fear
#13
REVIEW
Weihai Chen, Yan Wang, Xiaqing Wang, Hong Li
The last 10 years have witnessed a substantial progress in understanding the neural mechanisms for the renewal of the extinguished fear memory. Based on the theory of fear extinction, exposure therapy has been developed as a typical cognitive behavioral therapy for posttraumatic stress disorder. Although the fear memory can be extinguished by repeated presentation of conditioned stimulus without unconditioned stimulus, the fear memory is not erased and tends to relapse outside of extinction context, which is referred to as renewal...
May 2, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28462941/%C3%AE-adrenoceptor-blockade-in-the-basolateral-amygdala-but-not-the-medial-prefrontal-cortex-rescues-the-immediate-extinction-deficit
#14
Thomas F Giustino, Jocelyn R Seemann, Gillian M Acca, Travis D Goode, Paul J Fitzgerald, Stephen Maren
Early psychological interventions, such as exposure therapy, rely on extinction learning to reduce the development of stress- and trauma-related disorders. However, recent research suggests that extinction often fails to reduce fear when administered soon after trauma. This immediate extinction deficit (IED) may be due to stress-induced dysregulation of neural circuits involved in extinction learning. We have shown that systemic β-adrenoceptor blockade with propranolol rescues the IED, but impairs delayed extinction...
May 2, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28462472/role-of-the-agranular-insular-cortex-in-contextual-control-over-cocaine-seeking-behavior-in-rats
#15
Amy A Arguello, Rong Wang, Carey M Lyons, Jessica A Higginbotham, Matthew A Hodges, Rita A Fuchs
RATIONALE: Environmental stimulus control over drug relapse requires the retrieval of context-response-cocaine associations, maintained in long-term memory through active reconsolidation processes. Identifying the neural substrates of these phenomena is important from a drug addiction treatment perspective. OBJECTIVES: The present study evaluated whether the agranular insular cortex (AI) plays a role in drug context-induced cocaine-seeking behavior and cocaine memory reconsolidation...
May 2, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28461701/activation-of-a-novel-p70-s6-kinase-1-dependent-intracellular-cascade-in-the-basolateral-nucleus-of-the-amygdala-is-required-for-the-acquisition-of-extinction-memory
#16
T N Huynh, E Santini, E Mojica, A E Fink, B S Hall, R N Fetcho, L Grosenick, K Deisseroth, J E LeDoux, C Liston, E Klann
Repeated presentations of a previously conditioned stimulus lead to a new form of learning known as extinction, which temporarily alters the response to the original stimulus. Previous studies have shown that the consolidation of extinction memory requires de novo protein synthesis. However, the role of specific nodes of translational control in extinction is unknown. Using auditory threat conditioning in mice, we investigated the role of mechanistic target of rapamycin complex 1 (mTORC1) and its effector p70 S6 kinase 1 (S6K1) in the extinction of auditory threat conditioning...
May 2, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28456375/rolipram-improves-facilitation-of-contextual-fear-extinction-in-the-1-methyl-4-phenyl-1-2-3-6-tetrahydropyridine-induced-mouse-model-of-parkinson-s-disease
#17
Ken-Ichi Kinoshita, Yoshikage Muroi, Toshihiro Unno, Toshiaki Ishii
Cognitive impairment often occurs in Parkinson's disease (PD), but the mechanism of onset remains unknown. Recently, we reported that PD model mice produced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) show facilitation of hippocampal memory extinction, which may be the cause of cognitive impairment in PD. When we examined the cAMP/CREB signaling in the hippocampus, decreased levels of cAMP and phosphorylated CREB were observed in the dentate gyrus (DG) of MPTP-treated mice. Administration of rolipram improved the memory deficits with concomitant recovery of cAMP and phosphorylated CREB levels, suggesting that reduced cAMP/CREB signaling in the DG leads to cognitive impairment in MPTP-treated mice...
April 17, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/28453642/facilitation-of-contextual-fear-extinction-by-orexin-1-receptor-antagonism-is-associated-with-the-activation-of-specific-amygdala-cell-subpopulations
#18
África Flores, Cyril Herry, Rafael Maldonado, Fernando Berrendero
Background: Orexins are hypothalamic neuropeptides recently involved in the regulation of emotional memory. The basolateral amygdala (BLA), an area orchestrating fear memory processes, appears to be modulated by orexin transmission during fear extinction. However, the neuronal types within the BLA involved in this modulation remain to be elucidated. Methods: We used retrograde tracing combined with immunofluorescence techniques in mice to identify BLA projection neurons and cell subpopulations in this brain region influenced by orexin transmission during contextual fear extinction consolidation...
April 27, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28438613/stress-altered-synaptic-plasticity-and-damp-signaling-in-the-hippocampus-pfc-axis-elucidating-the-significance-of-igf-1-igf-1r-camkii%C3%AE-expression-in-neural-changes-associated-with-a-prolonged-exposure-therapy
#19
Olalekan M Ogundele, Philip J Ebenezer, Charles C Lee, Joseph Francis
Traumatic stress patients showed significant improvement in behavior after a prolonged exposure to an unrelated stimulus. This treatment method attempts to promote extinction of the fear memory associated with the initial traumatic experience. However, the subsequent prolonged exposure to such stimulus creates an additional layer of neural stress. Although the mechanism remains unclear, prolonged exposure therapy (PET) likely involves changes in synaptic plasticity, neurotransmitter function and inflammation; especially in parts of the brain concerned with the formation and retrieval of fear memory (Hippocampus and Prefrontal Cortex: PFC)...
April 27, 2017: Neuroscience
https://www.readbyqxmd.com/read/28435979/oxytocin-system-in-neuropsychiatric-disorders-old-concept-new-insights
#20
Afzal Misrani, Sidra Tabassum, Cheng Long
Oxytocin (OXT) is a neuropeptide that plays a pivotal role among species peripherally and centrally. It recently has attracted much attention for its involvement in anxiety-related behavior, stress regulation, social behavior and various neuropsychiatric disorders. OXT is one of the important mediators of emotional and social behaviors such as maternal behavior, fear extinction, social support, happiness, and trust. It is also involved in learning and memory process. The recent progresses in OXT system have put this neuropeptide as an important psychotherapeutic intervention for various psychiatric disorders such as stress, anxiety disorders, social phobia, postpartum depression, bipolar disorder, autism, and schizophrenia...
April 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
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