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Kodirov, Sodikdjon A.; Bonni, Kathrin; Wehrmeister, Michael; Lutz, Beat – Learning & Memory, 2021
The depolarization is also important for the short-term synaptic plasticity, known as depolarization-induced suppression of excitation (DSE). The two major types of neurons and their synapses in the lateral nucleus of amygdala (LA) are prone to plasticity. However, DSE in interneurons has not been reported in amygdala in general and in LA in…
Descriptors: Brain Hemisphere Functions, Cytology, Drug Use, Comparative Analysis
Eckert, Michael J.; Iyer, Kartik; Euston, David R.; Tatsuno, Masami – Learning & Memory, 2021
Neocortical sleep spindles have been shown to occur more frequently following a memory task, suggesting that a method to increase spindle activity could improve memory processing. Stimulation of the neocortex can elicit a slow oscillation (SO) and a spindle, but the feasibility of this method to boost SO and spindles over time has not been tested.…
Descriptors: Sleep, Memory, Cognitive Processes, Brain Hemisphere Functions
Engin, Elif; Sigal, Maksim; Benke, Dietmar; Zeller, Anja; Rudolph, Uwe – Learning & Memory, 2020
Reduction in the expression or function of [alpha]5-subunit-containing GABA[subscript A] receptors ([alpha]5GABA[subscript A]Rs) leads to improvement in several hippocampus-dependent memory domains. However, studies thus far mostly lack anatomical specificity in terms of neuronal circuits and populations. We demonstrate that mice with a selective…
Descriptors: Brain Hemisphere Functions, Memory, Animals, Spatial Ability
Sekeres, Melanie J.; Moscovitch, Morris; Grady, Cheryl L.; Sullens, D. Gregory; Winocur, Gordon – Learning & Memory, 2020
Conditioned fear memories that are context-specific shortly after conditioning generalize over time. We exposed rats to a context reminder 30 d after conditioning, which served to reinstate context-specificity, and investigated how this reminder alters retrieval-induced activity in the hippocampus and anterior cingulate cortex (aCC) relative to a…
Descriptors: Memory, Animals, Brain Hemisphere Functions, Conditioning
Zerbes, Gundula; Schwabe, Lars – Learning & Memory, 2019
Successful episodic memory requires binding of event details across spatial and temporal gaps. The neural processes underlying mnemonic binding, however, are not fully understood. Moreover, although acute stress is known to modulate memory, if and how stress changes mnemonic integration across time and space is unknown. To elucidate these issues,…
Descriptors: Spatial Ability, Stress Variables, Cognitive Processes, Memory
Broschard, Matthew B.; Kim, Jangjin; Love, Bradley C.; Wasserman, Edward A.; Freeman, John H. – Learning & Memory, 2019
A prominent theory of category learning, COVIS, posits that new categories are learned with either a declarative or procedural system, depending on the task. The declarative system uses the prefrontal cortex (PFC) to learn rule-based (RB) category tasks in which there is one relevant sensory dimension that can be used to establish a rule for…
Descriptors: Task Analysis, Brain Hemisphere Functions, Learning Processes, Animals
Valle, Rebecca Della; Mohammadmirzaei, Negin; Knox, Dayan – Learning & Memory, 2019
Clinical and preclinical studies that have examined the neurobiology of persistent fear memory in posttraumatic stress disorder (PTSD) have focused on the medial prefrontal cortex, hippocampus, and amygdala. Sensory systems, the periaqueductal gray (PAG), and midline thalamic nuclei have been implicated in fear and extinction memory, but whether…
Descriptors: Stress Variables, Fear, Memory, Brain Hemisphere Functions
Williams, Amy R.; Kim, Earnest S.; Lattal, K. Matthew – Learning & Memory, 2019
A fundamental property of extinction is that the behavior that is suppressed during extinction can be unmasked through a number of postextinction procedures. Of the commonly studied unmasking procedures (spontaneous recovery, reinstatement, contextual renewal, and rapid reacquisition), rapid reacquisition is the only approach that allows a direct…
Descriptors: Fear, Conditioning, Context Effect, Memory
Rungratsameetaweemana, Nuttida; Squire, Larry R. – Learning & Memory, 2018
The hippocampus has long been recognized as important for the formation of long-term memory. Recent work has suggested that the hippocampus might also be important for certain kinds of spatial operations, as in constructing scenes, shifting perspective, or perceiving the geometry of scenes and their boundaries. We explored this proposal using a…
Descriptors: Brain Hemisphere Functions, Neurological Impairments, Visual Stimuli, Comparative Analysis
Haque, Rafi U.; Manzanares, Cecelia M.; Brown, Lavonda N.; Pongos, Alvince L.; Lah, James J.; Clifford, Gari D.; Levey, Allan I. – Learning & Memory, 2019
The entorhinal-hippocampal circuit is one of the earliest sites of cortical pathology in Alzheimer's disease (AD). Visuospatial memory paradigms that are mediated by the entorhinal-hippocampal circuit may offer a means to detect memory impairment during the early stages of AD. In this study, we developed a 4-min visuospatial memory paradigm called…
Descriptors: Alzheimers Disease, Memory, Visual Perception, Spatial Ability
Hernandez, John S.; Wainwright, Marcy L.; Mozzachiodi, Riccardo – Learning & Memory, 2017
In "Aplysia," long-term sensitization (LTS) occurs concurrently with a suppression of feeding. At the cellular level, the suppression of feeding is accompanied by decreased excitability of decision-making neuron B51. We examined the contribution of voltage-gated Na[superscript +] and K[superscript +] channels to B51 decreased…
Descriptors: Decision Making, Brain Hemisphere Functions, Animals, Cytology
Fraize, Nicolas; Hamieh, Al Mahdy; Joseph, Mickael Antoine; Touret, Monique; Parmentier, Regis; Salin, Paul Antoine; Malleret, Gael – Learning & Memory, 2017
Phosphorylation of CaMKII and AMPA receptor GluA1 subunit has been shown to play a major role in hippocampal-dependent long-term/reference memory (RM) and in the expression of long-term synaptic potentiation (LTP). In contrast, it has been proposed that dephosphorylation of these proteins could be involved in the opposite phenomenon of hippocampal…
Descriptors: Brain Hemisphere Functions, Role, Teaching Methods, Short Term Memory
Pardilla-Delgado, Enmanuelle; Alger, Sara E.; Cunningham, Tony J.; Kinealy, Brian; Payne, Jessica D. – Learning & Memory, 2016
Numerous studies have investigated how stress impacts veridical memory, but how stress influences false memory formation remains poorly understood. In order to target memory consolidation specifically, a psychosocial stress (TSST) or control manipulation was administered following encoding of 15 neutral, semantically related word lists (DRM false…
Descriptors: Memory, Stress Variables, Interference (Learning), Word Lists
Es-seddiqi, Mouna; El Massioui, Nicole; Samson, Nathalie; Brown, Bruce L.; Doyère, Valérie – Learning & Memory, 2016
The amygdalo-nigrostriatal (ANS) network plays an essential role in enhanced attention to significant events. Interval timing requires attention to temporal cues. We assessed rats having a disconnected ANS network, due to contralateral lesions of the medial central nucleus of the amygdala (CEm) and dopaminergic afferents to the lateral striatum,…
Descriptors: Time, Cues, Animal Behavior, Animals
Bae, Sarah; Holmes, Nathan M.; Westbrook, R. Frederick – Learning & Memory, 2015
Four experiments used rats to study false context fear memories. In Experiment 1, rats were pre-exposed to a distinctive chamber (context A) or to a control environment (context C), shocked after a delay in a second chamber (context B) and tested either in B or A. Rats pre-exposed to A froze just as much as control rats in B but more than control…
Descriptors: Laboratory Experiments, Memory, Fear, Animals
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