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Probing a Hypothalamic-Midbrain Circuit for Model-Based Learning and Aberrant Decision-Making Following Methamphetamine
Probing a Hypothalamic-Midbrain Circuit for Model-Based Learning and Aberrant Decision-Mak...
Probing a Hypothalamic-Midbrain Circuit for Model-Based Learning and Aberrant Decision-Making Following Methamphetamine

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자료유형  
 학위논문 서양
최종처리일시  
20250211151412
ISBN  
9798382493565
DDC  
150
저자명  
Hoang, Ivy Belin.
서명/저자  
Probing a Hypothalamic-Midbrain Circuit for Model-Based Learning and Aberrant Decision-Making Following Methamphetamine
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
173 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
주기사항  
Advisor: Sharpe, Melissa;Izquierdo Edler, Alicia.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약Our decisions often involve consideration of prospective outcomes, which allow us to assess the consequences of our possible responses before deciding on a course of action. This process requires a detailed representation of how events are related so we can recall this information when appropriate. While normally adaptive, disruptions in this learning process can give rise to maladaptive behaviors underpinning neuropsychiatric disorders, such as with substance abuse. This dissertation investigates the neural substrates for the formation of associative maps between rewarding cues and outcomes, and how these neural circuits are changed with drug experience to contribute to maladaptive decision-making.Inhibition of GABAergic neurons in the lateral hypothalamus (LH) revealed the LH to be important for helping to learn detailed associations between cues and rewards that can be used to influence behavior. Targeted inhibition and stimulation of dopaminergic projections from the ventral tegmental area (VTA) to the LH were identified as facilitating learning about detailed cue-reward associations in LH. A history of methamphetamine experience was shown to increase the control that reward cues have over decision-making and to strengthen LH-VTA circuits. To examine endogenous dopamine activity in the LH and how this might change following drug exposure, we measured dopamine release across learning of cue-reward associations in rats with or without a prior history of methamphetamine self-administration. Dopamine release in the LH was shown to increase to cues and rewards across learning, which constitutes a unique profile of dopamine activity. Importantly, prior methamphetamine self-administration was found to amplify dopamine release to reward cues that emerges across learning. Altogether, these data characterize a circuit between the hypothalamus and the midbrain that supports the acquisition of detailed cue-reward associations that are strengthened with prior drug experiences to heighten the control that reward cues have over behavior.
일반주제명  
Behavioral sciences
일반주제명  
Neurosciences
일반주제명  
Psychology
키워드  
Dopamine
키워드  
Lateral hypothalamus
키워드  
Methamphetamine
키워드  
Ventral tegmental area
기타저자  
University of California, Los Angeles Psychology 0780
기본자료저록  
Dissertations Abstracts International. 85-11B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a150
■1001  ▼aHoang,  Ivy  Belin.
■24510▼aProbing  a  Hypothalamic-Midbrain  Circuit  for  Model-Based  Learning  and  Aberrant  Decision-Making  Following  Methamphetamine
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a173  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-11,  Section:  B.
■500    ▼aAdvisor:  Sharpe,  Melissa;Izquierdo  Edler,  Alicia.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aOur  decisions  often  involve  consideration  of  prospective  outcomes,  which  allow  us  to  assess  the  consequences  of  our  possible  responses  before  deciding  on  a  course  of  action.  This  process  requires  a  detailed  representation  of  how  events  are  related  so  we  can  recall  this  information  when  appropriate.  While  normally  adaptive,  disruptions  in  this  learning  process  can  give  rise  to  maladaptive  behaviors  underpinning  neuropsychiatric  disorders,  such  as  with  substance  abuse.  This  dissertation  investigates  the  neural  substrates  for  the  formation  of  associative  maps  between  rewarding  cues  and  outcomes,  and  how  these  neural  circuits  are  changed  with  drug  experience  to  contribute  to  maladaptive  decision-making.Inhibition  of  GABAergic  neurons  in  the  lateral  hypothalamus  (LH)  revealed  the  LH  to  be  important  for  helping  to  learn  detailed  associations  between  cues  and  rewards  that  can  be  used  to  influence  behavior.  Targeted  inhibition  and  stimulation  of  dopaminergic  projections  from  the  ventral  tegmental  area  (VTA)  to  the  LH  were  identified  as  facilitating  learning  about  detailed  cue-reward  associations  in  LH.  A  history  of  methamphetamine  experience  was  shown  to  increase  the control  that  reward  cues  have  over  decision-making  and  to  strengthen  LH-VTA  circuits.  To  examine  endogenous  dopamine  activity  in  the  LH  and  how  this  might  change  following  drug  exposure,  we  measured  dopamine  release  across  learning  of  cue-reward  associations  in  rats  with  or  without  a  prior  history  of  methamphetamine  self-administration.  Dopamine  release  in  the  LH  was  shown  to  increase  to  cues  and  rewards  across  learning,  which  constitutes  a  unique  profile  of  dopamine  activity.  Importantly,  prior  methamphetamine  self-administration  was  found  to  amplify  dopamine  release  to  reward  cues  that  emerges  across  learning.  Altogether,  these  data  characterize  a  circuit  between  the  hypothalamus  and  the  midbrain  that  supports  the  acquisition  of  detailed  cue-reward  associations  that  are  strengthened  with  prior  drug  experiences  to  heighten  the  control  that  reward  cues  have  over  behavior.
■590    ▼aSchool  code:  0031.
■650  4▼aBehavioral  sciences
■650  4▼aNeurosciences
■650  4▼aPsychology
■653    ▼aDopamine
■653    ▼aLateral  hypothalamus
■653    ▼aMethamphetamine
■653    ▼aVentral  tegmental  area
■690    ▼a0602
■690    ▼a0317
■690    ▼a0621
■71020▼aUniversity  of  California,  Los  Angeles▼bPsychology  0780.
■7730  ▼tDissertations  Abstracts  International▼g85-11B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161555▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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