Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"memory encoding"”.
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Neural Correlates of Item and Item-Context Memory Encoding
… of the formation of episodic memories -- or memory for an item and its context -- have been studied using a functional neuroimaging procedure known as the 'subsequent memory procedure'. In this procedure, neural activity associated with later remembered versus later forgotten study items is …
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Novelty, Prediction Error and Memory Encoding: Limitations of the Pimms Framework
The Predictive Interactive Multiple Memory Systems (PIMMS) framework has been used to explain how novelty, or more precisely “prediction error”, boosts memory encoding. In this thesis, I explored several other phenomena in the animal and human literature that PIMMS cannot yet explain but should. …
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Spatiotemporal Dynamics of Neural Activity During Human Episodic Memory Encoding and Retrieval
… our own personal mental time machine: episodic memory. Through episodic memory, we transport ourselves back in time to re-live experiences from our past. This allows us to reflect on our own self-knowledge, effectively placing ourselves in context of our lives. This dissertation investigates how …
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Mechanisms of Spoken Word Recognition and Memory Encoding Studied through Competitor Priming
… mechanisms of spoken word recognition and memory encoding by using a competitor priming paradigm - prior presentation (priming) of a competitor spoken word (e.g. hijack) is followed by the presentation of a similar sounding word sharing the same initial segments (e.g. hygiene). Consistent …
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Decoding the emotional modulation of memory encoding: a multivariate fmri study of arousal and valence
… to the neural patterns supporting memory encoding are not fully understood. We leveraged multivariate pattern analysis (MVPA) to dissociate these influences. We analysed fMRI data from a large cohort of participants during an emotional picture encoding task with a subsequent free …
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Dissociable Influence of Reward and Punishment Motivation on Declarative Memory Encoding and its Underlying Neurophysiology
… environment is represented in long-term memory. The present dissertation aims to delineate the influence of reward and punishment motivation on human declarative memory encoding and its underlying neural circuitry. Chapter 1 provides a theoretical framework for investigating motivation's …
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The precision of initial context fear memory encoding determines the behavioural, cognitive and molecular changes that occur following recall
Maintaining memory relevance in the face of an ever-changing world is essential for survival. When animals form memories about specific environmental contexts and their associations, they must be able to continually assess the validity of both those associations and of the contextual memories …
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Neuroimaging and behavioral investigation of declarative memory in South African children prenatally exposed to alcohol
… spectrum disorders (FASD). Although declarative memory impairment is a key feature of the neurocognitive profile of FASD, the mechanisms underlying this deficit require further clarification. The aim of this cross-sectional research was to examine, both directly and indirectly (via bottom-up and …
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How Do Anxiety, Stress, Impulsiveness, And Sleep Quality Affect Memory
Memory is a critical cognitive function that enables individuals to retain, recall, and apply knowledge across various contexts. Different memory systems, including working memory and long-term memory, collaborate to process and store information. Factors such as stress, sleep disturbances, …
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Inhibitory Control of Contextual Fear Memory and Memory Specificity
… neurons and GABA receptors in learning and memory. The study consists of three major components. In the first component (Chapter 2), I developed a novel technique to selectively target and control GABAergic interneurons (NDNF cells) distributed at the SLM of the hippocampus. With this …
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Modeling the hippocampus : finely controlled memory storage using spiking neurons
… While a fundamental understanding of a traumatic memory is still elusive, studying the physiology and functional properties of the hippocampus are anessential first step. Towards that goal, I developed a detailed computational model of the hippocampus. The model included the important effects of …
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The Effects of Age and Culture on Default Network Function: Frontal Compensation With Age; Modulation Differences Across Culture
… of the default network was examined in a memory encoding paradigm. With respect to age, it was theorized that suppression deficits in older adults would be compensated for by enhanced frontal recruitment. With respect to culture, a novel framework was proposed predicting modulation …
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Classification of whole brain fMRI activation patterns
… remember each scene in a post-scan recognition-memory test. We view the application of our tool to this memory encoding task as a step toward the development of tools that will enhance human learning. We train support vector machines on functional data to predict participants' performance in the …
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An Examination of Hippocampal and Prefrontal Contributions to Spatial Learning and Memory using Immediate Early Gene Imaging
… repeatedly been linked to spatial learning and memory processing; however, the precise roles of individual sub-regions within these areas continue to be debated. The Morris water maze is a well-known behavioural task used to measure spatial memory. Despite its popularity, the type of spatial …
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Encoding and recall of memory for reward location in the mouse hippocampus
The memory of where to find food can be crucial for an animal’s survival. Encoding and recall of these spatial memories involves the hippocampus, but whether and how hippocampal activity integrates memories of spatial relationships and locations is poorly understood. This thesis investigates how …
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The Neural Correlates of Allocentric Spatial Memory in Schizotypy
In this thesis, allocentric spatial memory was investigated in healthy volunteers with average and high levels of schizotypal traits assessed using the Schizotypal Personality Questionnaire. Functional and structural MRI was used to investigate the neural correlates of allocentric spatial memory in …
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Engrams, Neurogenesis, and Forgetting
… observed forgetting is not due to a deficit in memory encoding. Presentation of an environmental reminder one month following training led to memory recovery, suggesting that infantile forgetting is caused, at least in part, by a deficit in memory retrieval. Given the evidence that infantile …
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Aging and Event Segmentation
Episodic memory, our memory for events in our lives, typically becomes less detailed and more prone to error with advancing age. An extensive literature exists investigating age-related memory decline using simple stimuli (e.g., words, pictures), but fewer studies have used naturalistic stimuli …
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Mechanisms by which exercise promotes hippocampal function in both depressed and non-depressed individuals: A feasibility study
… called the hippocampus, which is important for memory processing. This study is investigating whether exercise may also improve hippocampal function in depressed humans. One way exercise may improve brain function is by normalizing levels of the hormone cortisol, and its toxic effects on the …
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