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  • 1
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    Category-specific cortical activity precedes retrieval during memory search (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-12-24
    Description: Here we describe a functional magnetic resonance imaging study of humans engaged in memory search during a free recall task. Patterns of cortical activity associated with the study of three categories of pictures (faces, locations, and objects) were identified by a pattern-classification algorithm. The algorithm was used to track the reappearance of these activity patterns during the recall period. The reappearance of a given category's activity pattern correlates with verbal recalls made from that category and precedes the recall event by several seconds. This result is consistent with the hypothesis that category-specific activity is cueing the memory system to retrieve studied items.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Polyn, Sean M -- Natu, Vaidehi S -- Cohen, Jonathan D -- Norman, Kenneth A -- MH070177-01/MH/NIMH NIH HHS/ -- R01MH052864/MH/NIMH NIH HHS/ -- R01MH069456/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2005 Dec 23;310(5756):1963-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, University of Pennsylvania, Philadelphia, PA 19104, USA. polyn@psych.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16373577" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Algorithms ; Brain/*physiology ; *Brain Mapping ; Female ; Form Perception/physiology ; Humans ; Magnetic Resonance Imaging ; Male ; Memory/*physiology ; Mental Recall/physiology ; Space Perception/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Neural activity in human hippocampal formation reveals the spatial context of retrieved memories (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-11-30
    Description: In many species, spatial navigation is supported by a network of place cells that exhibit increased firing whenever an animal is in a certain region of an environment. Does this neural representation of location form part of the spatiotemporal context into which episodic memories are encoded? We recorded medial temporal lobe neuronal activity as epilepsy patients performed a hybrid spatial and episodic memory task. We identified place-responsive cells active during virtual navigation and then asked whether the same cells activated during the subsequent recall of navigation-related memories without actual navigation. Place-responsive cell activity was reinstated during episodic memory retrieval. Neuronal firing during the retrieval of each memory was similar to the activity that represented the locations in the environment where the memory was initially encoded.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4669102/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4669102/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miller, Jonathan F -- Neufang, Markus -- Solway, Alec -- Brandt, Armin -- Trippel, Michael -- Mader, Irina -- Hefft, Stefan -- Merkow, Max -- Polyn, Sean M -- Jacobs, Joshua -- Kahana, Michael J -- Schulze-Bonhage, Andreas -- MH-061975/MH/NIMH NIH HHS/ -- R01 MH055687/MH/NIMH NIH HHS/ -- R01 MH061975/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2013 Nov 29;342(6162):1111-4. doi: 10.1126/science.1244056.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Drexel University, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24288336" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Separation ; Electrodes, Implanted ; Epilepsy ; Hippocampus/cytology/*physiology ; Humans ; *Memory, Episodic ; Neurons/*physiology ; Space Perception/*physiology ; Temporal Lobe/cytology/physiology ; User-Computer Interface
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Oscillatory patterns in temporal lobe reveal context reinstatement during memory search (2011)
    National Academy of Sciences
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    Publication Date: 2011-07-07
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Oscillatory patterns in temporal lobe reveal context reinstatement during memory search [Psychological and Cognitive Sciences] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-08-03
    Description: Psychological theories of memory posit that when people recall a past event, they not only recover the features of the event itself, but also recover information associated with other events that occurred nearby in time. The events surrounding a target event, and the thoughts they evoke, may be considered to represent a context for the target event, helping to distinguish that event from similar events experienced at different times. The ability to reinstate this contextual information during memory search has been considered a hallmark of episodic, or event-based, memory. We sought to determine whether context reinstatement may be observed in electrical signals recorded from the human brain during episodic recall. Analyzing electrocorticographic recordings taken as 69 neurosurgical patients studied and recalled lists of words, we uncovered a neural signature of context reinstatement. Upon recalling a studied item, we found that the recorded patterns of brain activity were not only similar to the patterns observed when the item was studied, but were also similar to the patterns observed during study of neighboring list items, with similarity decreasing reliably with positional distance. The degree to which individual patients displayed this neural signature of context reinstatement was correlated with their tendency to recall neighboring list items successively. These effects were particularly strong in temporal lobe recordings. Our findings show that recalling a past event evokes a neural signature of the temporal context in which the event occurred, thus pointing to a neural basis for episodic memory.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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