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Interactions of the hippocampus and non-hippocampal long-term memory systems during learning, remembering, and over time

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dc.contributor.advisor Sutherland, Robert J
dc.contributor.author Sparks, Fraser T
dc.date.accessioned 2012-09-12T18:10:48Z
dc.date.available 2012-09-12T18:10:48Z
dc.date.issued 2012
dc.identifier.uri http://hdl.handle.net/10133/3116
dc.description xvi, 161 leaves : ill. (some col.) ; 29 cm en_US
dc.description.abstract The hippocampus and non-hippocampal long-term memory systems each have the capacity to learn and express contextual fear memory. How these systems interact during learning and remembering revolves around hippocampal mediated interference, where the hippocampus dominates for both the acquisition and expression of long-term memory. Hippocampal interference during learning can be overcome by modifying learning parameters such that learning is distributed across multiple independent sessions. The standard view of the role of the hippocampus in long-term memory retrieval is that it is temporally limited, where recently acquired memory is dependent on hippocampal function though as a memory ages, dependency is transferred to other memory systems by a process called systems consolidation. Distributed training demonstrates that learning parameters create a memory that is resistant to hippocampal damage. We find little evidence to support temporally based systems consolidation, and present data that supports the view that if the hippocampus is initially involved in learning a memory, it will always be necessary for accurate retrieval of that memory. A critical assessment of the rat literature revealed that initial memory strength, and/or lesion techniques might be responsible for the few studies that report temporally graded retrograde amnesia using contextual fear conditioning. Our experiments designed to directly test these possibilities resulted in flat gradients, providing further evidence that the hippocampus plays a permanent role in long-term memory retrieval. We propose and assess alternatives to the standard model and conclude that a dual store model is most parsimonious within the presented experiments and related literature. Interactions of the hippocampus and non-hippocampal systems take place at the time of learning and remembering, and are persistent over time. en_US
dc.language.iso en_US en_US
dc.publisher Lethbridge, Alta. : University of Lethbridge, Dept. of Neuroscience, c2012 en_US
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en_US
dc.subject Hippocampus (Brain) -- Research en_US
dc.subject Long-term memory -- Research en_US
dc.subject Memory -- Physiological aspects -- Research en_US
dc.subject Rats as laboratory animals en_US
dc.title Interactions of the hippocampus and non-hippocampal long-term memory systems during learning, remembering, and over time en_US
dc.type Thesis en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Neuroscience en_US
dc.degree.level Doctor of Philosophy
dc.degree.discipline Neuroscience
dc.organization University of Lethbridge
dc.librarysymbol ALU
dc.degree.field Arts and Science
dc.degree.subfield Sciences

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