Sökning: "brain systems"

Visar resultat 1 - 5 av 350 avhandlingar innehållade orden brain systems.

  1. 1. Train your brain updating, transfer, and neural changes

    Detta är en avhandling från Umeå : Department of Integrative Medical Biology, Section for Physiology, Umeå university

    Författare :Erika Dahlin; Umeå universitet.; Umeå universitet.; Umeå universitet.; [2009]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; cognitive training; executive functioning; transfer; fMRI; brain system; young adults; elderly; practice; neural correlates; individual differences; MEDICINE Physiology and pharmacology Physiology Experimental brain research; MEDICIN Fysiologi och farmakologi Fysiologi Experimentell hjärnforskning; SOCIAL SCIENCES Social sciences Psychology Cognitive science; SAMHÄLLSVETENSKAP Socialvetenskap Psykologi Kognitionsforskning; fysiologi; Physiology;

    Sammanfattning : An initial aim of this thesis was to determine whether training of a specific executive function (updating) produces improvements in performance on trained and transfer tasks, and whether the effects are maintained over time. Neural systems underlying training and transfer effects were also investigated and one question considered is whether transfer depends on general or specific neural overlap between training and transfer tasks. LÄS MER

  2. 2. Segmentation and Visualisation of Human Brain Structures

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Roger Hult; Uppsala universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bildanalys; segmentation; visualisation; brain; cortex; hippocampus; autoradiography; MRI; PET; ROI; Bildanalys; TECHNOLOGY Information technology Image analysis; TEKNIKVETENSKAP Informationsteknik Bildanalys; Computerized Image Analysis; datoriserad bildanalys;

    Sammanfattning : In this thesis the focus is mainly on the development of segmentation techniques for human brain structures and of the visualisation of such structures. The images of the brain are both anatomical images (magnet resonance imaging (MRI) and autoradigraphy) and functional images that show blood flow (functional magnetic imaging (fMRI), positron emission tomography (PET), and single photon emission tomograpy (SPECT)). LÄS MER

  3. 3. Hybrid observers for systems with intrinsic pulse-modulated feedback

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Diana Yamalova; Uppsala universitet.; Uppsala universitet.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hybrid systems; impulsive systems; biomedical systems; Goodwin s oscillator; observers; time-delay; Elektroteknik med inriktning mot reglerteknik; Electrical Engineering with specialization in Automatic Control;

    Sammanfattning : Dynamical processes resulting from the interaction of continuous and discrete dynamics are often encountered in living organisms. Time evolutions of such processes constitute continuous variables that are subject to instant changes at discrete points of time. LÄS MER

  4. 4. Aerobic fitness and healthy brain aging cognition, brain structure, and dopamine

    Detta är en avhandling från Umeå : Umeå Universitet

    Författare :Lars Jonasson; Umeå universitet.; Umeå universitet.; Umeå universitet.; [2017]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Aerobic exercise; VO2; working memory; executive function; freesurfer; striatum; dopamine; D2-receptors; [11C]raclopride;

    Sammanfattning : Background: Performing aerobic exercise and maintaining high levels of aerobic fitness may have positive effects on both brain structure and function in older adults. Despite decades of research however, there is still a rather poor understanding of the neurocognitive mechanisms explaining the positive effects of aerobic exercise on cognition. LÄS MER

  5. 5. Novel strategies for enzyme replacement with gene therapy in models of Parkinson’s disease

    Detta är en avhandling från Brain Repair and Imaging in Neural Systems (BRAINS)

    Författare :Erik Cederfjäll; Lunds universitet.; Lund University.; [2014]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; AAV vectors; dopamine; enzyme replacement; gene regulation; GTP cyclohydrolase 1; L-DOPA; tyrosine hydroxylase; Parkinson’s disease;

    Sammanfattning : Popular Abstract in Swedish Ungefär 22 000 svenskar lever i dag med Parkinsons sjukdom som är en hjärnsjukdom där särskilda nervceller som normalt producerar signalsubstansen dopamin dör av okänd anledning. Dessa nervceller har en viktig funktion eftersom de möjliggör vår rörelseförmåga och brist på dopamin leder till rörelsenedsättning där patienten uppvisar symptomen långsamhet, skakningar, muskelstelhet samt hopsjunken hållning. LÄS MER