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Sculpting Visual Cortex: How Recurrent Structure, Modulatory Signals, and Development Shape V1 Responses
Sculpting Visual Cortex: How Recurrent Structure, Modulatory Signals, and Development Shape V1 Responses
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105636
- ISBN
- 9798265462657
- DDC
- 616
- 서명/저자
- Sculpting Visual Cortex: How Recurrent Structure, Modulatory Signals, and Development Shape V1 Responses
- 발행사항
- [Sl] : Columbia University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 181 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Miller, Kenneth D.;Asenjo Garcia, Ana.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2025.
- 초록/해제
- 요약The primary visual cortex (V1) is the first cortical area to process retinal signals, and the classical picture featuring feedforward orientation-selective inputs and recurrent amplification is well established. However, this view is incomplete: V1 receives modulatory inputs from non-visual sources and orientation selectivity emerges even before visual experience. My thesis explores how modulation and development shape V1 responses across three complementary projects. In my first project, I show that optogenetic stimulation of macaque V1 excitatory neurons produces diverse single-cell responses yet preserves the population statistics of neurons whose feature preferences match the visual stimulus - a phenomenon we term "rate reshuffling." While randomly connected networks can reproduce this effect, they require strong coupling and tight excitatory-inhibitory cancellation inconsistent with observations. In contrast, I show that networks with feature-dependent structure generate reshuffling robustly under more biologically plausible conditions. My second project explores the underlying mechanisms by developing a mean-field framework for networks with feature-dependent structure in which decomposing global activity into tuned and untuned components reveals effective interactions between the visual-stimulus-matched and baseline populations. A linear response analysis then shows that strongly-coupled, feedback-inhibition-dominated networks exhibit suppressive baseline-to-matched interactions, robustly explaining the lack of matched responses to the optogenetic stimulus. In my final project, I characterize how endogenous mechanisms generate orientation selective and spatially organized visual responses in ferret V1 before the onset of vision. I propose that strong receptive field biases drive recurrent interactions to form phase-insensitive responses in layer 4, which are transformed into orientation-selective and spatially periodic activity in layers 2/3. This structure differs from the mature architecture but naturally emerges from activity-dependent plasticity driven by geniculate activity prior to eye-opening. My findings reveal mechanisms by which visually and behaviorally relevant signals can coexist in separate populations and demonstrate that structured visual representations can emerge without prior visual experience.
- 일반주제명
- Neurosciences
- 일반주제명
- Applied physics
- 일반주제명
- Computational physics
- 일반주제명
- Physiology
- 키워드
- Visual cortex
- 기타저자
- Columbia University Physics
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798265462657
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a616
■1001 ▼aNguyen, Tuan Huu.
■24510▼aSculpting Visual Cortex: How Recurrent Structure, Modulatory Signals, and Development Shape V1 Responses
■260 ▼a[Sl]▼bColumbia University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a181 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Miller, Kenneth D.;Asenjo Garcia, Ana.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2025.
■520 ▼aThe primary visual cortex (V1) is the first cortical area to process retinal signals, and the classical picture featuring feedforward orientation-selective inputs and recurrent amplification is well established. However, this view is incomplete: V1 receives modulatory inputs from non-visual sources and orientation selectivity emerges even before visual experience. My thesis explores how modulation and development shape V1 responses across three complementary projects. In my first project, I show that optogenetic stimulation of macaque V1 excitatory neurons produces diverse single-cell responses yet preserves the population statistics of neurons whose feature preferences match the visual stimulus - a phenomenon we term "rate reshuffling." While randomly connected networks can reproduce this effect, they require strong coupling and tight excitatory-inhibitory cancellation inconsistent with observations. In contrast, I show that networks with feature-dependent structure generate reshuffling robustly under more biologically plausible conditions. My second project explores the underlying mechanisms by developing a mean-field framework for networks with feature-dependent structure in which decomposing global activity into tuned and untuned components reveals effective interactions between the visual-stimulus-matched and baseline populations. A linear response analysis then shows that strongly-coupled, feedback-inhibition-dominated networks exhibit suppressive baseline-to-matched interactions, robustly explaining the lack of matched responses to the optogenetic stimulus. In my final project, I characterize how endogenous mechanisms generate orientation selective and spatially organized visual responses in ferret V1 before the onset of vision. I propose that strong receptive field biases drive recurrent interactions to form phase-insensitive responses in layer 4, which are transformed into orientation-selective and spatially periodic activity in layers 2/3. This structure differs from the mature architecture but naturally emerges from activity-dependent plasticity driven by geniculate activity prior to eye-opening. My findings reveal mechanisms by which visually and behaviorally relevant signals can coexist in separate populations and demonstrate that structured visual representations can emerge without prior visual experience.
■590 ▼aSchool code: 0054.
■650 4▼aNeurosciences
■650 4▼aApplied physics
■650 4▼aComputational physics
■650 4▼aPhysiology
■653 ▼aElectrophysiology
■653 ▼aMean-field methods
■653 ▼aRecurrent neural networks
■653 ▼aSynaptic plasticity
■653 ▼aVisual cortex
■690 ▼a0317
■690 ▼a0215
■690 ▼a0216
■690 ▼a0719
■71020▼aColumbia University▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360911▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


