Sökning: "startle"

Visar resultat 1 - 5 av 17 avhandlingar innehållade ordet startle.

  1. 1. Fear, Startle, and Fear-Potentiated Startle : Probing Emotion in the Human Brain

    Författare :Anna Pissiota; Mats Fredrikson; Scott Rauch; Uppsala universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; Psychology; anxiety; attention; brain; fear; fear-potentiated startle; human; neuroimaging; positron emission tomography; posttraumatic stress disorder; regional cerebral blood flow; startle; startle habituation; symptom provocation; Psykologi; Psychology; Psykologi; Psychology; psykologi;

    Sammanfattning : The present thesis explored the neurobiological basis of three aspects of defense behaviors in humans. Positron emission tomography methodology was used, and changes in regional cerebral blood flow (rCBF) were measured as an index of neural activity. LÄS MER

  2. 2. The Effect of Steroid Hormones in the Female Brain During Different Reproductive States

    Författare :Elin Bannbers; Inger Sundström-Poromaa; Johan Wikström; Kristiina Kask; Eriksson Elias; Uppsala universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Premenstrual dysphoric disorder; Postpartum; Estradiol; Progesterone; Menstrual cycle; Functional magnetic resonance imaging; Response inhibition; Prepulse inhibition; Startle response; Medicinsk vetenskap; Medical Science;

    Sammanfattning : Women are twice as likely as men to suffer from depression and anxiety disorders and have an increased risk of onset during periods associated with hormonal changes, such as the postpartum period and the menopausal transition. Furthermore, some women seem more sensitive to normal hormone fluctuations across the menstrual cycle, since approximately 3-5% suffers from premenstrual dysphoric disorder (PMDD). LÄS MER

  3. 3. Antipredator defence in butterflies

    Författare :Martin Olofsson; Christer Wiklund; Graeme Ruxton; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Antipredator defence; Bird; Crypsis; Predator; Predator-prey interaction; Prey-attack behavior; Butterfly; Deimatic behavior; Eyespots; Startle display; zoologisk ekologi; Animal Ecology;

    Sammanfattning : Predation exerts a potent selection mechanism and has resulted in a suite of antipredation adaptations encompassing morphological and behavioral traits in prey. In butterflies, several such traits appear to be directed towards birds which are considered as one of their major predators. LÄS MER

  4. 4. Physiological Stress Reactivity in Late Pregnancy

    Författare :Charlotte Hellgren; Inger Sundström-Poromaa; Helena Åkerud; Mats Hammar; Uppsala universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICAL AND HEALTH SCIENCES; acoustic startle response; allopregnanolone; antenatal; anxiety; cold pressor test; cortisol; cortisol awakening response; depression; electrodermal; estradiol; hypothalamic-pituitary-adrenal axis; postpartum; pregnancy; progesterone; skin conductance; stress; sympathetic nervous system; Medical Science; Medicinsk vetenskap;

    Sammanfattning : During pregnancy, the basal activity is increased in both of our major stress response systems: the sympathetic nervous system and the hypothalamic-pituitary-adrenal axis. At the same time, the reactivity towards stressors is reduced. These alterations sustain maternal and fetal homeostasis, and are involved in the regulation of gestational length. LÄS MER

  5. 5. Schizophrenia and Nitric Oxide: Deficits in Information Processing Invetigated in Animal Models

    Författare :Daniel Klamer; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; phencyclidine – nitric oxide – prepulse inhibition – habituation – acoustic startle – cAMP – in vivo microdialysis – NMDA receptor – rat – mouse – schizophrenia;

    Sammanfattning : Rationale: Schizophrenia-like symptoms can be induced in humans by phencyclidine (PCP), a non-competitive antagonist of the N-methyl-D-aspartate (NMDA) receptor. Schizophrenic patients and PCP-treated animals display deficits in pre-attentive information processing, as assessed by e.g. prepulse inhibition of the acoustic startle response. LÄS MER