Neural correlates of olfactory and visual memory performance in 3D-simulated mazes after intranasal insulin application.
Neurobiol Learn Mem
; 134 Pt B: 256-63, 2016 10.
Article
em En
| MEDLINE
| ID: mdl-27492601
ABSTRACT
This fMRI study intended to establish 3D-simulated mazes with olfactory and visual cues and examine the effect of intranasally applied insulin on memory performance in healthy subjects. The effect of insulin on hippocampus-dependent brain activation was explored using a double-blind and placebo-controlled design. Following intranasal administration of either insulin (40IU) or placebo, 16 male subjects participated in two experimental MRI sessions with olfactory and visual mazes. Each maze included two separate runs. The first was an encoding maze during which subjects learned eight olfactory or eight visual cues at different target locations. The second was a recall maze during which subjects were asked to remember the target cues at spatial locations. For eleven included subjects in the fMRI analysis we were able to validate brain activation for odor perception and visuospatial tasks. However, we did not observe an enhancement of declarative memory performance in our behavioral data or hippocampal activity in response to insulin application in the fMRI analysis. It is therefore possible that intranasal insulin application is sensitive to the methodological variations e.g. timing of task execution and dose of application. Findings from this study suggest that our method of 3D-simulated mazes is feasible for studying neural correlates of olfactory and visual memory performance.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Percepção Visual
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Encéfalo
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Aprendizagem em Labirinto
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Percepção Olfatória
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Neuroimagem Funcional
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Memória Espacial
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Hipoglicemiantes
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Insulina
Tipo de estudo:
Clinical_trials
Limite:
Adult
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Humans
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Male
Idioma:
En
Revista:
Neurobiol Learn Mem
Assunto da revista:
BIOLOGIA
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CIENCIAS DO COMPORTAMENTO
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NEUROLOGIA
Ano de publicação:
2016
Tipo de documento:
Article