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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 Shap...
Sculpting Visual Cortex: How Recurrent Structure, Modulatory Signals, and Development Shape V1 Responses

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105636
ISBN  
9798265462657
DDC  
616
저자명  
Nguyen, Tuan Huu.
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  
Electrophysiology
키워드  
Mean-field methods
키워드  
Recurrent neural networks
키워드  
Synaptic plasticity
키워드  
Visual cortex
기타저자  
Columbia University Physics
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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MARC

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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.

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