Visual perception and representation of objects and faces
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 2003.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/29988 |
| _version_ | 1811088817704140800 |
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| author | Sadr, Javid, 1973- |
| author2 | Pawan Sinha. |
| author_facet | Pawan Sinha. Sadr, Javid, 1973- |
| author_sort | Sadr, Javid, 1973- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 2003. |
| first_indexed | 2024-09-23T14:07:57Z |
| format | Thesis |
| id | mit-1721.1/29988 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T14:07:57Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/299882019-04-12T12:31:58Z Visual perception and representation of objects and faces Sadr, Javid, 1973- Pawan Sinha. Massachusetts Institute of Technology. Dept. of Brain and Cognitive Sciences. Massachusetts Institute of Technology. Dept. of Brain and Cognitive Sciences. Brain and Cognitive Sciences. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 2003. Includes bibliographical references (leaves 87-95). Interpreting the results of visual object perception experiments is too often ill-posed due to the disparate and sparse choice of stimuli. To address this problem, we have developed a flexible new technique called Random Image Structure Evolution (RISE). In the simplest case, RISE involves the presentation of image sequences depicting the evolution of a coherent image from a seemingly random field, along with the reverse sequences depicting the transformation back into randomness. As it samples a subset of the space of possible stimulus images, RISE image processing strictly preserves low-level attributes such as frequency spectra and luminance, and RISE experiments are designed to provide objectively verifiable measures of the onset and offset of subjects' conscious percepts. In turn, these onset and offset measures can serve as quantitative markers for characterizing a number of intriguing perceptual phenomena. Here I describe the basic RISE paradigm and discuss experimental applications of this technique which, it is hoped, may contribute greatly to the study of key aspects of high-level vision. Building on results from psychophysical studies of perceptual onset, priming, and hysteresis, as well as findings from a magnetoencephalographic study using RISE, this thesis explores the use of RISE in characterizing the perceptual markers and neural substrates of object and face perception. In addition, this thesis examines the issue of object perception and, in particular, robust face perception, within the context of the cortical representations that may underly them, presenting and evaluating a simple, well-motivated image coding scheme based on ordinal relations. by Javid Sadr. Ph.D. 2006-03-24T18:09:29Z 2006-03-24T18:09:29Z 2003 2003 Thesis http://hdl.handle.net/1721.1/29988 54792260 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 95, [1] leaves 5124594 bytes 5124401 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Brain and Cognitive Sciences. Sadr, Javid, 1973- Visual perception and representation of objects and faces |
| title | Visual perception and representation of objects and faces |
| title_full | Visual perception and representation of objects and faces |
| title_fullStr | Visual perception and representation of objects and faces |
| title_full_unstemmed | Visual perception and representation of objects and faces |
| title_short | Visual perception and representation of objects and faces |
| title_sort | visual perception and representation of objects and faces |
| topic | Brain and Cognitive Sciences. |
| url | http://hdl.handle.net/1721.1/29988 |
| work_keys_str_mv | AT sadrjavid1973 visualperceptionandrepresentationofobjectsandfaces |