Contrast-invariant orientation tuning and efficient selection in human visual cortex
Abstract/Contents
- Abstract
- The visual system is a complex network of structures that work together to process and make sense of visual information derived from the surrounding environment. This dissertation explores the challenges faced by the visual system, both externally and internally, in achieving its goal of providing a coherent perception of the visual world. Chapter 2 focuses on contrast-invariant orientation tuning, a remarkable ability of the visual system to maintain stable perception regardless of changes in stimulus contrasts. While extensively studied in non-human primates, the existence of contrast-invariant orientation tuning in human visual cortex has been uncertain. I present evidence that orientation tuning in human visual cortex remains invariant to changes in stimulus contrast. Chapter 3 investigates the neural mechanism of selective attention and its impact on contrast-discrimination behavior. By employing different task designs with varying numbers of targets, the association between the number of targets and different attention mechanisms is examined. It is demonstrated that the efficient selection mechanism is utilized when multiple targets are present, while both the efficient selection and response gain mechanisms are associated with fewer targets. Also, the efficient selection model proves to be effective in explaining the behavior in attention tasks. In investigating these mechanisms, I utilize the steady-state visual evoked potential (SSVEP) frequency tagging technique involving multiple input stimuli, which is an effective tool for studying both sensory and cognitive processes. This dissertation contributes to our understanding of how the human visual system adapts to external changes and internal demands, shedding light on the mechanisms of contrast-invariant orientation tuning and selective attention.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Lee, Min Young |
|---|---|
| Degree supervisor | Gardner, Justin, 1971- |
| Thesis advisor | Gardner, Justin, 1971- |
| Thesis advisor | Gweon, Hyowon |
| Thesis advisor | Norcia, Anthony Matthew |
| Degree committee member | Gweon, Hyowon |
| Degree committee member | Norcia, Anthony Matthew |
| Associated with | Stanford University, School of Humanities and Sciences |
| Associated with | Stanford University, Department of Psychology |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Min Young Lee. |
|---|---|
| Note | Submitted to the Department of Psychology. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/bs178gp8510 |
Access conditions
- Copyright
- © 2023 by Min Young Lee
- License
- This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).
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