Sökning: "visual cortex"

Visar resultat 16 - 20 av 65 avhandlingar innehållade orden visual cortex.

  1. 16. Aspects of memory and representation in cortical computation

    Författare :Martin Rehn; Anders Lansner; Örjan Ekeberg; Peter Földiák; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cerebral cortex; neural networks; attractor memory; sequence learning; biological vision; generative models; serial order; computational neuroscience; dynamical synapses; Computer science; Datalogi;

    Sammanfattning : Denna avhandling i datalogi föreslår modeller för hur vissa beräkningsmässiga uppgifter kan utföras av hjärnbarken. Utgångspunkten är dels kända fakta om hur en area i hjärnbarken är uppbyggd och fungerar, dels etablerade modellklasser inom beräkningsneurobiologi, såsom attraktorminnen och system för gles kodning. LÄS MER

  3. 17. Visual perception in infancy and its links to later autism

    Författare :Irzam Hardiansyah; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Alterations in primary sensory areas of the brain have been suggested to be at the roots of the well-documented visual perceptual differences in autism. However, despite the possible key role these sensory processing alterations may play in the early development of autism, few studies have tried to clarify the links. LÄS MER

  4. 18. Structural and functional changes in the brain after surgically repaired median nerve injury

    Författare :Per F. Nordmark; Roland S. Johansson; Henrik Ehrsson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Humans; Hand; Touch; Peripheral nerve injury; Magnetic resonance imaging; Somatosensory Cortex; Cortical plasticity; fysiologi; Physiology; handkirurgi; hand surgery;

    Sammanfattning : Despite the best available surgical repair, traumatic median nerve injury within the forearm typically causes lifelong impairment in hand function. This stems from an inadequate reinnervation of the nerves supporting sensory functions of the thumb, index and long finger, and of nerves supplying intrinsic hand muscles. LÄS MER

  5. 19. The neural substrates of non-conscious working memory

    Författare :Fredrik Bergström; Johan Eriksson; Lars Nyberg; René Marois; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; non-conscious; working memory; neural substrates; visual perception; consciousness; functional magnetic resonance imaging fMRI ;

    Sammanfattning : Background: Despite our distinct impression to the contrary, we are only conscious of a fraction of all the neural activity underlying our thoughts and behavior. Most neural processes occur non-consciously, and in parallel with our conscious experience. LÄS MER

  7. 20. Neuropsychological Function in Relation to Structural and Functional Brain Changes in Alzheimer’s Disease

    Författare :Eva Elgh; Jarl Risberg; Umeå universitet; []
    Nyckelord :Alzheimer´s disease; neuropsychological function; episodic memory; hippocampus; prefrontal cortex; brain imaging; MRI; fMRI; SPECT; LHPA-axis; cortisol; geriatrik; Geriatrics;

    Sammanfattning : The aim of this doctoral thesis was to study neuropsychological function in relation to structural and functional brain changes in Alzheimer´s disease (AD). In the first study relations between hippocampal volume, neuropsychological function and limbic-hypothalamic-pituitary-adrenal (LHPA) axis disturbances in AD were investigated with magnetic resonance imaging (MRI). LÄS MER