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Illuminating Subicular Dynamics Through Multiphoton Holography
Illuminating Subicular Dynamics Through Multiphoton Holography
Illuminating Subicular Dynamics Through Multiphoton Holography

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105200
ISBN  
9798297617261
DDC  
616
저자명  
O'Neil, Darik Andrew.
서명/저자  
Illuminating Subicular Dynamics Through Multiphoton Holography
발행사항  
[Sl] : Columbia University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
155 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
주기사항  
Advisor: Yuste, Rafael.
학위논문주기  
Thesis (Ph.D.)--Columbia University, 2025.
초록/해제  
요약The subiculum has a poorly-defined, but necessary, role in the neurobiology of memory, despite a rich tradition of research investigating hippocampal contributions to memory. While traditional models of memory retrieval highlight the reactivation of a specific engram formed during learning, emerging evidence suggests the subiculum is necessary for the retrieval of trace fear memories without being necessary for their initial encoding. This presents a central paradox: how can a brain region be critical for retrieving a memory it wasn't necessary to form? Given the subiculum's unique, recurrent architecture, its diverse array of projections, and a broad implication in the etiology of epilepsy, we hypothesized that the subiculum may be facilitating engram reactivation through the amplification of CA1 output. To test this hypothesis, we conducted multiphoton holographic calcium imaging of the subiculum and subicular-hippocampal border region during an ethologically-grounded, trace-fear conditioning task. In this task, mice learned to associate one of two tones (CS+, CS-) with an aversive stimulus despite being separated by a 10-second stimulus-free trace period. Conditioned fear expression took the form of burrowing: head-fixed mice retract a lightweight "burrow" that slides along a frictionless rail.Surprisingly, we observed robust activity in response to both the CS+ and CS-. We observed rapid, cue-onset evoked responses specific to both the CS+ and CS-. In contrast, subicular activity exhibited reciprocal changes at cue-offset. Unexpectedly, the offset of CS- tone triggered an unexpected, immediate burst of activity. Meanwhile, we observed a substantial reduction of activity in specific neurons during CS+ trials, which peaked near the anticipated US delivery. Our result suggests that the subiculum behaves less like a conveyor belt for a canonical replay of a fixed engram and more like a signal processing hub that projects dense, high-dimensional information from which downstream regions can flexibly extract information without requiring substantial network reconfiguration.
일반주제명  
Neurosciences
일반주제명  
Optics
일반주제명  
Biomedical engineering
일반주제명  
Medical imaging
일반주제명  
Computational physics
키워드  
Calcium imaging
키워드  
Holography
키워드  
Multiphoton microscopy
키워드  
Subicular dynamics
키워드  
Memories
기타저자  
Columbia University Neurobiology and Behavior
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798297617261
■035    ▼a(MiAaPQ)AAI32244671
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616
■1001  ▼aO'Neil,  Darik  Andrew.
■24510▼aIlluminating  Subicular  Dynamics  Through  Multiphoton  Holography
■260    ▼a[Sl]▼bColumbia  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a155  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-04,  Section:  B.
■500    ▼aAdvisor:  Yuste,  Rafael.
■5021  ▼aThesis  (Ph.D.)--Columbia  University,  2025.
■520    ▼aThe  subiculum  has  a  poorly-defined,  but  necessary,  role  in  the  neurobiology  of  memory,  despite  a  rich  tradition  of  research  investigating  hippocampal  contributions  to  memory.  While  traditional  models  of  memory  retrieval  highlight  the  reactivation  of  a  specific  engram  formed  during  learning,  emerging  evidence  suggests  the  subiculum  is  necessary  for  the  retrieval  of  trace  fear  memories  without  being  necessary  for  their  initial  encoding.  This  presents  a  central  paradox:  how  can  a  brain  region  be  critical  for  retrieving  a  memory  it  wasn't  necessary  to  form?  Given  the  subiculum's  unique,  recurrent  architecture,  its  diverse  array  of  projections,  and  a  broad  implication  in  the  etiology  of  epilepsy,  we  hypothesized  that  the  subiculum  may  be  facilitating  engram  reactivation  through  the  amplification  of  CA1  output.  To  test  this  hypothesis,  we  conducted  multiphoton  holographic  calcium  imaging  of  the  subiculum  and  subicular-hippocampal  border  region  during  an  ethologically-grounded,  trace-fear  conditioning  task.  In  this  task,  mice  learned  to  associate  one  of  two  tones  (CS+,  CS-)  with  an  aversive  stimulus  despite  being  separated  by  a  10-second  stimulus-free  trace  period.  Conditioned  fear  expression  took  the  form  of  burrowing:  head-fixed  mice  retract  a  lightweight  "burrow"  that  slides  along  a  frictionless  rail.Surprisingly,  we  observed  robust  activity  in  response  to  both  the  CS+  and  CS-.  We  observed  rapid,  cue-onset  evoked  responses  specific  to  both  the  CS+  and  CS-.  In  contrast,  subicular  activity  exhibited  reciprocal  changes  at  cue-offset.  Unexpectedly,  the  offset  of  CS-  tone  triggered  an  unexpected,  immediate  burst  of  activity.  Meanwhile,  we  observed  a  substantial  reduction  of  activity  in  specific  neurons  during  CS+  trials,  which  peaked  near  the  anticipated  US  delivery.  Our  result  suggests  that  the  subiculum  behaves  less  like  a  conveyor  belt  for  a  canonical  replay  of  a  fixed  engram  and  more  like  a  signal  processing  hub  that  projects  dense,  high-dimensional  information  from  which  downstream  regions  can  flexibly  extract  information  without  requiring  substantial  network  reconfiguration.
■590    ▼aSchool  code:  0054.
■650  4▼aNeurosciences
■650  4▼aOptics
■650  4▼aBiomedical  engineering
■650  4▼aMedical  imaging
■650  4▼aComputational  physics
■653    ▼aCalcium  imaging
■653    ▼aHolography
■653    ▼aMultiphoton  microscopy
■653    ▼aSubicular  dynamics
■653    ▼aMemories
■690    ▼a0317
■690    ▼a0752
■690    ▼a0541
■690    ▼a0574
■690    ▼a0216
■71020▼aColumbia  University▼bNeurobiology  and  Behavior.
■7730  ▼tDissertations  Abstracts  International▼g87-04B.
■790    ▼a0054
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359700▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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