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