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Reeders, Puck C.; Hamm, Amanda G.; Allen, Timothy A.; Mattfeld, Aaron T. – Learning & Memory, 2021
Remembering sequences of events defines episodic memory, but retrieval can be driven by both ordinality and temporal contexts. Whether these modes of retrieval operate at the same time or not remains unclear. Theoretically, medial prefrontal cortex (mPFC) confers ordinality, while the hippocampus (HC) associates events in gradually changing…
Descriptors: Memory, Brain Hemisphere Functions, Diagnostic Tests, Task Analysis
Hellerstedt, Robin; Talmi, Deborah – Learning & Memory, 2022
Reward is thought to attenuate forgetting through the automatic effect of dopamine on hippocampal memory traces. Here we report a conceptual replication of previous results where we did not observe this effect of reward. Participants encoded eight lists of pictures and recalled picture content immediately or the next day. They were informed that…
Descriptors: Rewards, Recall (Psychology), Brain Hemisphere Functions, Memory
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
Koch, Griffin E.; Akpan, Essang; Coutanche, Marc N. – Learning & Memory, 2020
The features of an image can be represented at multiple levels--from its low-level visual properties to high-level meaning. What drives some images to be memorable while others are forgettable? We address this question across two behavioral experiments. In the first, different layers of a convolutional neural network (CNN), which represent…
Descriptors: Prediction, Memory, Brain Hemisphere Functions, Task Analysis
Bergstrom, Hadley C.; Lieberman, Abby G.; Graybeal, Carolyn; Lipkin, Anna M.; Holmes, Andrew – Learning & Memory, 2020
Most experimental preparations demonstrate a role for dorsolateral striatum (DLS) in stimulus-response, but not outcome-based, learning. Here, we assessed DLS involvement in a touchscreen-based reversal task requiring mice to update choice following a change in stimulus-reward contingencies. In vivo single-unit recordings in the DLS showed…
Descriptors: Brain Hemisphere Functions, Stimuli, Responses, Learning Processes
Sathiyakumar, Sankirthana; Carrasco, Sofia Skromne; Saad, Lydia; Richards, Blake A. – Learning & Memory, 2020
Behavioral flexibility is important in a changing environment. Previous research suggests that systems consolidation, a long-term poststorage process that alters memory traces, may reduce behavioral flexibility. However, exactly how systems consolidation affects flexibility is unknown. Here, we tested how systems consolidation affects: (1)…
Descriptors: Memory, Animals, Rewards, Food
Jordan, Jake T.; Tong, Yi; Pytte, Carolyn L. – Learning & Memory, 2022
Plasticity is a neural phenomenon in which experience induces long-lasting changes to neuronal circuits and is at the center of most neurobiological theories of learning and memory. However, too much plasticity is maladaptive and must be balanced with substrate stability. Area CA3 of the hippocampus provides such a balance via hemispheric…
Descriptors: Spatial Ability, Brain Hemisphere Functions, Memory, Learning Processes
Gemzik, Zachary M.; Donahue, Margaret M.; Griffin, Amy L. – Learning & Memory, 2021
Spatial working memory (SWM) is the ability to encode, maintain, and retrieve spatial information over a temporal gap, and relies on a network of structures including the medial septum (MS), which provides critical input to the hippocampus. Although the role of the MS in SWM is well-established, up until recently, we have been unable to use…
Descriptors: Short Term Memory, Spatial Ability, Task Analysis, Cues
Scott, Gavin A.; Liu, Max C.; Tahir, Nimra B.; Zabder, Nadine K.; Song, Yuanyi; Greba, Quentin; Howland, John G. – Learning & Memory, 2020
Working memory (WM), the capacity for short-term storage of small quantities of information for immediate use, is thought to depend on activity within the prefrontal cortex. Recent evidence indicates that the prefrontal neuronal activity supporting WM is driven by thalamocortical connections arising in mediodorsal thalamus (mdThal). However, the…
Descriptors: Role, Animals, Brain Hemisphere Functions, Short Term Memory
Nauer, Rachel K.; Schon, Karin; Stern, Chantal E. – Learning & Memory, 2020
With a rising aging population, it is important to develop behavioral tasks that assess and track cognitive decline, and to identify protective factors that promote healthy brain aging. Mnemonic discrimination tasks that rely on pattern separation mechanisms are a promising metric to detect subtle age-related memory impairments. Behavioral…
Descriptors: Mnemonics, Physical Fitness, Cognitive Ability, Aging (Individuals)
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
Chung, Ain; Dahan, Nessy; Alarcon, Juan Marcos; Fenton, André A. – Learning & Memory, 2017
Nonprotein coding dendritic BC1 RNA regulates translation of mRNAs in neurons. We examined two lines of BC1 knockout mice and report that loss of BC1 RNA exaggerates group I mGluR-stimulated LTD of the Schaffer collateral synapse, with one of the lines showing a much more enhanced DHPG-induced LTD than the other. When the animals were given the…
Descriptors: Memory, Brain Hemisphere Functions, Biochemistry, Animals
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
Smith, Christine N.; Squire, Larry R. – Learning & Memory, 2017
Eye movements can reflect memory. For example, participants make fewer fixations and sample fewer regions when viewing old versus new scenes (the repetition effect). It is unclear whether the repetition effect requires that participants have knowledge (awareness) of the old-new status of the scenes or if it can occur independent of knowledge about…
Descriptors: Eye Movements, Brain Hemisphere Functions, Memory, Decision Making
Ocampo, Amber C.; Squire, Larry R.; Clark, Robert E. – Learning & Memory, 2018
Prior experience has been shown to improve learning in both humans and animals, but it is unclear what aspects of recent experience are necessary to produce beneficial effects. Here, we examined the capacity of rats with complete hippocampal lesions, restricted CA1 lesions, or sham surgeries to benefit from prior experience. Animals were tested in…
Descriptors: Prior Learning, Experience, Spatial Ability, Memory