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VISUAL ATTENTION
IN SPATIAL CUING AND VISUAL SEARCH
by
Jongsoo Baek
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHYLOSOPHY
(PSYCHOLOGY)
May 2012
Copyright 2012 Jongsoo Baek
Object Description
| Title | Visual attention in spatial cuing and visual search |
| Author | Baek, Jongsoo |
| Author email | jongsoob@usc.edu;Jongsoo.Baek@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Psychology |
| School | College of Letters, Arts And Sciences |
| Date defended/completed | 2011-12-15 |
| Date submitted | 2012-02-16 |
| Date approved | 2012-02-16 |
| Restricted until | 2012-02-16 |
| Date published | 2012-02-16 |
| Advisor (committee chair) | Lu, Zhong-Lin |
| Advisor (committee member) |
Tjan, Bosco S. Mather, Mara Mather, Rand Baudry, Michel |
| Abstract | Signal detection theory (D. M. Green & J. A. Swets, 1966) based uncertainty models (M.P. Eckstein, 1998; Palmer, 1994) with an unlimited capacity attention system have provided an excellent account of the set-size effects in visual search accuracy. However, spatial cuing task experiments found strong effects of attention - precuing improves accuracy, especially when the target is embedded in high level of external noise (Dosher & Lu, 2000a; Lu & Dosher, 2000). In this research, we attempted to resolve the apparent contradictory conclusions from these two major lines of inquiry in spatial attention. We hypothesize that the conditions under which effects of spatially cued attention are substantial should correspond to the circumstances in which attention effects over and above uncertainty should occur in visual search. Many of the classical visual search experiments have been carried out using stimulus conditions where attention effects are least likely to be found. We studied visual search in a range of external noise, signal contrast, and target-distractor similarity conditions. In each trial, 8 Gabor patches were shown in each of two brief intervals, with one target at a different orientation from the distractors in one of the presentations. Subjects were pre-cued to a subset of the stimuli (1, 2, 4 or 8) and asked to report (1) which interval contained the target and (2) where the target was. In both zero noise and low signal contrast, and all high external noise conditions, the set-size effects were greater than that predicted by decision uncertainty model. All these results are well accounted by a model that combines the elaborated perceptual template model (Jeon, et al., 2009), the attention mechanisms developed in the PTM framework (Lu & Dosher, 1998), and the SDT based uncertainty calculations. Our empirical results and theoretical model generate a common taxonomy of visual attention in spatial cuing and visual search. |
| Keyword | adaptive procedure; attention; cueing; psychometric function; search; uncertainty |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Contributing entity | University of Southern California |
| Rights | Baek, Jongsoo |
| Physical access | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@dots.usc.edu |
| Archival file | uscthesesreloadpub_Volume6/etd-BaekJongso-476.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@dots.usc.edu |
| Full text | VISUAL ATTENTION IN SPATIAL CUING AND VISUAL SEARCH by Jongsoo Baek A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHYLOSOPHY (PSYCHOLOGY) May 2012 Copyright 2012 Jongsoo Baek |
