Open research questions in Memory and Neural Mechanisms
596 gap statements mined from Memory and Neural Mechanisms papers in our 7.9M-paper local library, which holds 2,384 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.
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What the literature leaves open
The potential stress associated with isolation can play a role during behavioral testing, particularly in small nonhuman social primates like marmosets. Human interference and age, sex, and dosing regimen can affect the results. The need for a nuanced understanding of the effects of scopolamine on cognitive abilities.
The evidence for β-adrenergic blockade with propranolol is inconsistent across behavioural paradigms. The effects of MK-801 and propranolol diverge in pavlovian-instrumental transfer and autoshaping settings.
Appetitive Pavlovian conditioned approach to reward location is reduced by both adrenergic and NMDA receptor antagonism at memory reconsolidation · 2026 · DOIFuture studies designed to dissociate exploratory motivation from memory-updating will further clarify the contribution of OFC circuits to these processes. Future studies should explore underlying neural circuitry of the observed behavioral and cellular effects, specifically OFC-hippocampus pathways.
Chemogenetic inhibition of the ventrolateral orbitofrontal cortex disrupts novelty-guided updating of spatial memories and alters hippocampal engram reactivation · 2026 · DOIThe role of the ventrolateral OFC in memory-updating, beyond value-based learning, is not well understood. The study aims to address this gap by investigating the specific contribution of VLO to memory-updating.
Chemogenetic inhibition of the ventrolateral orbitofrontal cortex disrupts novelty-guided updating of spatial memories and alters hippocampal engram reactivation · 2026 · DOIThe biological mechanisms through which structured connectivity emerges via learning in Continuous Attractor Neural Networks (CANNs) are not well understood. The classical formulation of CANNs relies on pre-wired recurrent connectivity, but this does not account for the self-organization of the network.
Prospective coding and path integration emerge as equilibrium solutions of self-organizing neural networks with firing-rate adaptation · 2026 · DOIThe lack of knowledge on the specific role of β2-adrenergic receptors in object recognition memory. The need to investigate the neural correlates underlying object recognition memory recall.
Sex-specific exploration patterns and noradrenergic modulation in object recognition memory: Role of the perirhinal cortex · 2026 · DOIThe lack of understanding of how the hippocampus integrates socially conveyed threat with spatial information. The need for a novel approach to explore the role of the intermediate hippocampus in socially acquired contextual threat.
The intermediate hippocampus integrates shock-observation and spatial information during observational fear memory in male rats · 2026 · DOILack of understanding of the brain-wide connections of the parvicellular subdivision of the BL and BM. Limited knowledge of the differential connections of the BLpc and BMpc.
Brain-wide connections of the parvicellular subdivision of the basolateral and basomedial amygdaloid nuclei in the rats · 2025 · DOIThe neural mechanisms underlying the acquisition and updating of spatial representations are not fully understood. It is unclear if the same neurons are involved in the acquisition, stabilization, and updating of spatial representations.
Multiplexed detection of nuclear immediate early gene expression reveals hippocampal neuronal subpopulations that engage in the acquisition and updating of spatial experience · 2025 · DOIHowever, the precise cellular and molecular mechanisms underlying FM remain insufficiently understood.
Spatial Transcriptomic Dissection of the Cellular and Molecular Architecture of Fear Memory and its Association with Memory Function · 2026 · DOIEstrogen-mediated regulation may therefore provide a therapeutic avenue for suppressing maladaptive FM, although the underlying mechanisms remain incompletely defined.
Spatial Transcriptomic Dissection of the Cellular and Molecular Architecture of Fear Memory and its Association with Memory Function · 2026 · DOIPerception reflects the dynamic integration of prior expectations, uncertainty, and incoming sensory evidence, but the neural circuitry supporting these computations remains debated.
Learned Audiovisual Predictability Modulates Depth-Resolved Hippocampal-Cortical Functional Coupling · 2026 · DOIWhile cellular excitability is known to drive the allocation of select hippocampal neurons into these ensembles, the underlying molecular mechanisms remain elusive.
Although this process depends on coordinated activity across the hippocampal network, it remains unclear how specific subfields differentially contribute to social recognition.
The Intermediate CA1 and CA3 Subfields of the Hippocampus Differentially Encode Social Recognition · 2026 · DOINeural replay has been linked to skill consolidation during wakeful rest, yet its physiological context in humans remains poorly understood.
However, the mechanisms supporting this essential dialogue across brain areas remain poorly understood.
Sequential coupling of sleep oscillations enables concept-neuron reactivation and supports information flow across the human hippocampal-cortical circuit · 2026 · DOIHowever, the underlying mechanisms of individual differences in the formation of social fear memory remain unclear.
Innate anxiety in rats determines vulnerability to social fear conditioning and social fear memory · 2026 · DOIIn contrast, age and local structural measures did not account for individual differences in either measure.
These findings extend the limited literature on sex steroid regulation of male cognition and underscore the importance of considering both estrogenic and androgenic pathways in models of hippocampal memory processing, with potential implications for understanding sex-specific vulnerabilities to cognitive decline and neuropsychiatric disorders.
Androgens and estrogens rapidly facilitate short-term memory in the dorsal hippocampus of male mice · 2026 · DOIThe study had a limited sample size - Motion-related artifacts affected some of the data - Technical issues and fussiness of infants resulted in some unusable data - The study only examined the amygdala and did not consider other brain…
Investigate the relationship between neonatal amygdala structure and fear processing in older children - Examine the effects of early life stress on children's brain development and long-term health - Study the development of fear processing in different populations, such as those with anxiety-related…
Further study on the effects of scopolamine on cognitive function, - Investigation of the underlying cholinergic mechanisms, - Comparison with traditional laboratory testing…
Investigate the long-term effects of propranolol and MK-801 on appetitive Pavlovian conditioned approach, - Examine the effects of different doses of propranolol and MK-801, - Study the effects of propranolol and MK-801 in different behavioural…
Appetitive Pavlovian conditioned approach to reward location is reduced by both adrenergic and NMDA receptor antagonism at memory reconsolidation · 2026 · DOIInvestigating the effects of non-homogeneous density on the model's behavior, - Exploring the application of the model to other neural systems, - Analyzing the robustness of the model to perturbations…
Prospective coding and path integration emerge as equilibrium solutions of self-organizing neural networks with firing-rate adaptation · 2026 · DOIFuture studies using differential labeling of these two distinct subpopulations within each CA PNs are warranted to examine such a possibility, - further studies using cross-labeling approaches are required to address whether the topological pattern of extrahippocampal projection is influenced by intrinsic differences between the two fluorescent proteins, - future studies with larger cohorts are warranted…
Anatomical topology of extrahippocampal projections from dorsoventral CA pyramidal neurons in mice · 2024 · DOI
Most-cited papers in Memory and Neural Mechanisms
- A synaptic model of memory: long-term potentiation in the hippocampus · Nature · 1993 · 9,586 citations
- The Brain's Default Network · Annals of the New York Academy of Sciences · 2008 · 8,574 citations
- Place navigation impaired in rats with hippocampal lesions · Nature · 1982 · 4,625 citations
- Why there are complementary learning systems in the hippocampus and neocortex: Insights from the successes and failures of connectionist models of learning and memory. · Psychological Review · 1995 · 4,076 citations
- Memory and the hippocampus: A synthesis from findings with rats, monkeys, and humans. · Psychological Review · 1992 · 3,958 citations
- The Molecular Biology of Memory Storage: A Dialogue Between Genes and Synapses · Science · 2001 · 2,941 citations
- More hippocampal neurons in adult mice living in an enriched environment · Nature · 1997 · 2,779 citations
- Differential contribution of amygdala and hippocampus to cued and contextual fear conditioning. · Behavioral Neuroscience · 1992 · 2,658 citations
- Reactivation of Hippocampal Ensemble Memories During Sleep · Science · 1994 · 2,645 citations
- The Medial Temporal Lobe Memory System · Science · 1991 · 2,415 citations
Most recent work
- Hippocampal mechanisms resolve competition in memory and perception · bioRxiv · 2026
- Dynamical mechanisms of astrocyte-neuron coupling for the integration of short- and long-term memory · Nonlinear Dynamics · 2026
- Hippocampal representations of alternative possibilities are flexibly generated to meet cognitive demands · bioRxiv · 2026
- A multi-region recurrent circuit for evidence accumulation in rats · Neuron · 2026
- Disruption of theta-timescale spiking impairs learning but spares hippocampal replay · bioRxiv · 2026
- Spontaneous behavior is a succession of self-directed tasks · Neuron · 2026
- Positive and Negative Retinotopic Codes in the Human Hippocampus · bioRxiv · 2026
- Early-life stress impairs development of functional interactions and neuronal activity within prefrontal-amygdala networks in vivo · Molecular Psychiatry · 2026
- Neural population dynamics and temporal context cells in macaque medial parietal cortex support temporal order memory · PLoS Biology · 2026
- Hippocampal theta sweeps indicate goal direction during navigation · Nature Neuroscience · 2026
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