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Timing of saccadic eye movements during an accumulative visual search task
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Wu, Chia-Chien. Timing of saccadic eye movements during an accumulative visual search task. Retrieved from https://doi.org/doi:10.7282/T3445K7S

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TitleTiming of saccadic eye movements during an accumulative visual search task
NameWu, Chia-Chien (author); Kowler, Eileen (chair); Feldman, Jacob (internal member); Singh, Manish (internal member); Rucci, Michele (outside member); Rutgers University; Graduate School - New Brunswick
Date Created2012
Other Date2012-10 (degree)
SubjectPsychology, Eye--Movements
Extentvii, 75 p. : ill.
DescriptionThe quality of visual performance depends on how efficiently saccades can be programmed. During each intersaccadic pause, the visual system needs to evaluate the fixated content and also determine where to look next. Most prior studies focused only on the spatial element of saccadic decisions but ignored the effect of time. A good search strategy should be able to apportion time between saccade production rate and the accuracy of target selection to maximize the acquisition of information. The current work is interested in how time is used in saccadic planning and how people decide when to look next. To answer these questions, a novel experiment was designed where subjects were asked to search through arrays of targets (thin circles containing oriented lines) embedded in non-targets (thicker circles), either to estimate a statistical property of the targets (mean orientation of the lines), or to just look at the targets. Varying the visual similarity of targets and non-targets had large effects on both the probability of landing on a target and the number of circles fixated per second in both estimation and the look-only tasks. Also, the eye dwelled longer on targets than on distractors even in the look-only task, where there was no need to evaluate target content. Saccadic dwell times, however, were about the same, regardless of whether the eye moved next to a target or to a distractor. The results show that the timing of saccades depends on (1) the currently fixated content, (2) accumulated evidence in eccentric vision and also (3) an internal timer. The strategy, which incorporates these three factors rather than simply relies on any one of them, may guarantee efficient use of time in saccadic planning.
NotePh.D.
NoteIncludes bibliographical references
Noteby Chia-Chien Wu
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/T3445K7S
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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