Visuospatial information: integrating and updating across saccades
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The Ohio State University / OhioLINK
2020
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1587561006883305 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu15875610068833052021-08-03T07:14:30Z Visuospatial information: integrating and updating across saccades Zhang, Xiaoli Psychology Cognitive Psychology Neurosciences Every time we move our eyes, a slightly different image is recorded at the back of our eye (i.e., the retina). However, we seldom perceive this change in the visual world due to frequent eye movements or saccades. How we maintain stable perception of the world is then a critical yet complex question to understand our visual system and cognitive processes. My dissertation aims at understanding more about visual stability from three example visual functions that interact with saccades. Chapter 1 (General Introduction) briefly summarizes the relevant literature on visual stability. Chapter 2 explores the brain representations of top-down spatial attention in retinotopic (eye-centered) and spatiotopic (world-centered) reference frames across saccades. By analyzing the patterns of brain activity from fMRI scans, I found that updating spatial attention across saccades might be coded with a combination of attention “shift” and “hold” signals across different brain regions/networks. Chapter 3 focuses on how saccades affect the perception and neural representations of 3D stimulus depth. Participants passively viewed stimuli at different 3D locations, and the brain representations of vertical and depth information were assessed and compared between no-saccade blocks and saccade blocks. The results showed that in saccade blocks, despite the retinal changes in horizontal position induced by the saccades, both vertical and depth information could still be decoded in visual areas, to a similar extent as in no-saccade blocks. In contrast, little vertical or depth information could be decoded across no-saccade blocks with different eye positions in any visual areas, indicating eye-position-dependency during stable fixation. Representations of spatial locations (2D and depth) may become more tolerant of eye positions during “dynamic” saccades, perhaps due to active remapping during saccades which may encourage more stable representations of the world. Chapter 4 presents a human behavioral study focused on target localization, where participants remembered and reported the location of the target on the screen after making a saccade, with task-irrelevant nontarget objects presented alongside. The results showed that the spatial relationship between the target and nontargets was utilized for target localization; however it also biased responses spatially. The final Chapter 5 (General Discussion) discusses how these three studies together help to further understand how visual information is integrated despite changeable inputs due to eye movements. 2020-09-24 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1587561006883305 http://rave.ohiolink.edu/etdc/view?acc_num=osu1587561006883305 restricted--full text unavailable until 2022-05-13 This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Psychology Cognitive Psychology Neurosciences |
| spellingShingle |
Psychology Cognitive Psychology Neurosciences Zhang, Xiaoli Visuospatial information: integrating and updating across saccades |
| author |
Zhang, Xiaoli |
| author_facet |
Zhang, Xiaoli |
| author_sort |
Zhang, Xiaoli |
| title |
Visuospatial information: integrating and updating across saccades |
| title_short |
Visuospatial information: integrating and updating across saccades |
| title_full |
Visuospatial information: integrating and updating across saccades |
| title_fullStr |
Visuospatial information: integrating and updating across saccades |
| title_full_unstemmed |
Visuospatial information: integrating and updating across saccades |
| title_sort |
visuospatial information: integrating and updating across saccades |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2020 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1587561006883305 |
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AT zhangxiaoli visuospatialinformationintegratingandupdatingacrosssaccades |
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