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You searched for +publisher:"Harvard University" +contributor:("Cavanagh, Patrick"). Showing records 1 – 2 of 2 total matches.

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Harvard University

1. Suchow, Jordan William. Measuring, monitoring, and maintaining memories in a partially observable mind.

Degree: PhD, Psychology, 2014, Harvard University

Visual memory holds in mind details of objects, textures, faces, and scenes. After initial exposure to an image, however, visual memories rapidly degrade because they are transferred from iconic memory, a high-capacity sensory buffer, to working memory, a low-capacity maintenance system. How does visual memory maintenance work? This dissertation builds the argument that the maintenance of short-term visual memories is analogous to the act of breathing: it is a dynamic process with a default behavior that explains much of its usual workings, but which can be observed, overridden, and controlled. Chapter 1 shows how the act of trying to remember more information causes people to forget faster and to remember less ("load-dependent forgetting" and "overreaching"). It then shows how the paradigm of evolution can be applied to the problem of maintenance, with memories competing over a limited memory-supporting commodity, explaining these effects. Chapter 2 presents experiments on metamemory, the ability of people to observe and make decisions about their own memories. The experiments isolate a component of metamemory that monitors a memory's quality as it degrades over time. Chapter 3 connects memory to metamemory, drawing on work from reinforcement learning and decision theory to liken the problem of memory maintenance to that of an agent who sequentially decides what to prioritize in a partially observable mind.

Psychology

Advisors/Committee Members: Alvarez, George Angelo (advisor), Cavanagh, Patrick (committee member), Schacter, Daniel (committee member), Nowak, Martin (committee member).

Subjects/Keywords: Cognitive psychology; metamemory; psychophysics; visual memory; working memory

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Suchow, J. W. (2014). Measuring, monitoring, and maintaining memories in a partially observable mind. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274120

Chicago Manual of Style (16th Edition):

Suchow, Jordan William. “Measuring, monitoring, and maintaining memories in a partially observable mind.” 2014. Doctoral Dissertation, Harvard University. Accessed September 25, 2020. http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274120.

MLA Handbook (7th Edition):

Suchow, Jordan William. “Measuring, monitoring, and maintaining memories in a partially observable mind.” 2014. Web. 25 Sep 2020.

Vancouver:

Suchow JW. Measuring, monitoring, and maintaining memories in a partially observable mind. [Internet] [Doctoral dissertation]. Harvard University; 2014. [cited 2020 Sep 25]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274120.

Council of Science Editors:

Suchow JW. Measuring, monitoring, and maintaining memories in a partially observable mind. [Doctoral Dissertation]. Harvard University; 2014. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274120

2. Aghdaee, Seyed Mehdi. Temporal Processing in the Visual System.

Degree: PhD, Psychology, 2012, Harvard University

Encoding time is one of the most important features of the mammalian brain. The visual system, comprising almost half of the brain is of no exception. Time processing enables us to make goal-directed behavior in the optimum “time window” and launch a ballistic eye movement, reach/grasp an object or direct our processing resources (attention) from one point of interest to another. In addition, encoding time is critical for higher cognitive functions, enabling us to make causal inferences. The limitations of temporal individuation in the visual stream seem to vary across the visual field: the resolution gradually drops as objects become farther away from the center of gaze, where little differences were found in terms of resolution for objects in the upper versus lower visual field. This resolution of temporal individuation is vastly different from the resolution ascribed to spatial individuation. If individuation is mediated through attention, as some researchers have proposed, the general term ”attention” seems to possess different properties, at least regarding temporal and spatial processing. Next we looked at another aspect of encoding time: Temporal Order Judgments (TOJ), where animals had to judge the relative timing onset of two visual events. After training two monkeys on the task, we recorded from neurons in the lateral intraparietal area (LIP), while the animals reported the perceived order of two visual stimuli. We found that LIP neurons show differential activity based on the animal’s perceptual choice: when the animal reports the stimulus inside the receptive field of the neuron as first, the cells show an increased level of activity compared to when the animal reports he same stimulus as second. This differential activity was most reliable in the tonic period of the response ((∼100 ms) after stimulus onset). However, no difference in visual response latencies was observed between the different perceptual choices. The parietal cortex has previously been implicated in temporal processing based on patient studies as well as neuroimaging investigations. Physiological studies have also suggested the involvement of parietal area in encoding elapsed time. However, our study is the first to demonstrate parietal neurons encoding relative timing.

Psychology

Advisors/Committee Members: Assad, John Abraham (advisor), Nakayama, Ken (committee member), Cavanagh, Patrick (committee member), Assad, John (committee member), Maunsell, John (committee member), Born, Richard (committee member), Cook, Erik (committee member).

Subjects/Keywords: Cognitive psychology; Neurosciences; LIP; Temporal Order Judgment; Temporal Processing; Time; Vision

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Aghdaee, S. M. (2012). Temporal Processing in the Visual System. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:10433469

Chicago Manual of Style (16th Edition):

Aghdaee, Seyed Mehdi. “Temporal Processing in the Visual System.” 2012. Doctoral Dissertation, Harvard University. Accessed September 25, 2020. http://nrs.harvard.edu/urn-3:HUL.InstRepos:10433469.

MLA Handbook (7th Edition):

Aghdaee, Seyed Mehdi. “Temporal Processing in the Visual System.” 2012. Web. 25 Sep 2020.

Vancouver:

Aghdaee SM. Temporal Processing in the Visual System. [Internet] [Doctoral dissertation]. Harvard University; 2012. [cited 2020 Sep 25]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10433469.

Council of Science Editors:

Aghdaee SM. Temporal Processing in the Visual System. [Doctoral Dissertation]. Harvard University; 2012. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10433469

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