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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

O papel de oscila??es beta2 e de interneur?nios OLM?2 da regi?o CA1 do hipocampo de camundongos na mem?ria de reconhecimento de objetos

Fran?a, Arthur S?rgio Cavalcanti de 04 October 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-09T22:59:49Z No. of bitstreams: 1 ArthurSergioCavalcantiDeFranca_TESE.pdf: 14502072 bytes, checksum: 07eea320317f9aa96a67cda6ed40b06a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-13T23:54:25Z (GMT) No. of bitstreams: 1 ArthurSergioCavalcantiDeFranca_TESE.pdf: 14502072 bytes, checksum: 07eea320317f9aa96a67cda6ed40b06a (MD5) / Made available in DSpace on 2017-03-13T23:54:25Z (GMT). No. of bitstreams: 1 ArthurSergioCavalcantiDeFranca_TESE.pdf: 14502072 bytes, checksum: 07eea320317f9aa96a67cda6ed40b06a (MD5) Previous issue date: 2016-10-04 / O hipocampo ? relacionado com a forma??o de mem?rias explicitas e com a capacidade de reconhecer novos objetos. No presente trabalho visamos contribuir para uma maior compreens?o do papel da regi?o CA1 do hipocampo nestes processos. Atrav?s da aplica??o de t?cnicas de eletrofisiologia, comportamento animal, psicofarmacologia e optogen?tica em camundongos transg?nicos e selvagens, encontramos que c?lulas OLM?2 do CA1 atuam na codifica??o da representa??o de objetos em uma tarefa de reconhecimento de objetos, e tamb?m influenciam a codifica??o de mem?rias aversivas em uma tarefa associativa de medo ao contexto. Al?m disso, descrevemos uma nova atividade oscilat?ria no potencial de campo local do CA1 na frequ?ncia beta 2 (23-30 Hz), que ? caracteristicamente transit?ria e ligada ? detec??o de novos objetos durante uma tarefa de reconhecimento de objetos. Estes resultados sugerem potenciais mecanismos celulares e de rede neuronal na regi?o CA1 subjacentes ao seu papel na forma??o de mem?rias e na detec??o de novidade. / The hippocampus is associated to novelty detection and formation of explicit memories. The present work aims at better understanding the role of the CA1 region of the hippocampus in these processes. By employing electrophysiology, animal behavior, psychopharmacology and optogenetic techniques in transgenic and wild-type mice, we found that CA1 OLM?2 cells influence the formation of new object representations in an object recognition task, as well as the encoding of aversive memories in a contextual fear memory task. Furthermore, we characterized a new oscillatory activity in the local field potential of CA1 at beta 2 frequency (23-30 Hz), which was typically transient and linked to the amount of novelty in an object recognition task. These results suggest potential cellular and network mechanisms that underlie the role of CA1 in memory formation and novelty detection.

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