Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"fear responses"”.
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EFFECTS OF ACUTE THC ADMINISTRATION ON EXTINCTION OF CONDITIONED FEAR RESPONSES IN HUMANS: A FUNCTIONAL ANALYSIS OF HIGH DENSITY EEG
… administration on extinction of conditioned fear responses. Fear conditioning was initiated using a differential classical conditioning paradigm that paired an aversive unconditioned stimulus (shock) with a signaling stimulus (CS+), whereas another stimulus served as a safety signal (CS-). …
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Infusion of oxytocin into the basolateral amygdala facilitates, whereas infusion into the central nucleus impairs extinction of context conditioned fear responses in rats
… et al., 2012) reduced conditioned freezing responses. In contrast, intracerebroventricular (i.c.v.) administration of OT increased conditioned freezing responses (Toth, Neumann, & Slattery, 2012). The route of administration may account for these differences in fear responses. Specifically, …
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Media social responsibility and risk communication : a critical analysis of newspaper headlines of the SARS outbreak
… analytical framework to evaluate the extent of fearful language, style of communication about risk of the disease, use of source material, and prevalence of journalistic normative behaviors. The analysis indicates that personal fear responses of journalists may influence the use of frightening …
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Group II Metabolic Glutamate Receptors in the Basal Amygdala Regulate Sleep and Fear-Induced Alterations in Sleep
… with the CNA, is involved in conditioned fear and fear extinction. However, the potential role of the BA in the regulation of sleep has received little attention. In this study, we investigated the role of mGlu II receptors in sleep and stress-induced alterations in sleep.</p> <p>In work …
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Dissecting the Functional Heterogeneity of Serotonergic Systems That Regulate Fear and Panic
… a flight or escape response) or condi-tioned fear behaviors is still elusive. Therefore, utilizing circuit-based gain- and loss-of-function approaches to selectively manipulate amygdala- and PeFR-projecting sero-tonergic systems, we hypothesize that specific serotonergic networks projecting to …
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Emotional Behavior in Subclinical Psychopathy
… in emotion modulated psychophysiological responses as well as deficits in emotionally influenced decision making. Results indicated that individuals with higher levels of Fearless Dominance, as measured by the Psychopathic Personality Inventory, Revised (Lilienfeld & Widows, 2005) had …
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Social Cognition in Disorders of the Basal Ganglia
… Patients with Huntington’s exhibited reduced fear responses which most likely results from abnormal amygdala activity. Patients with Tourette’s exhibited deficits on a wide range of social cognitive tasks involving reasoning about mental states, non-literal language interpretation and economic …
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The psychological dimension of living with fear of terrorism: Social identity, existential anxiety, and media influence
… was to investigate various dimensions of fear, terrorism, existentialism, and the wider societal implications of fearing terrorism, as well as examine the mechanisms influencing such fear and review existing literature. To achieve these objectives, the study recruited eight participants …
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The Role of the Infralimbic-Basal Forebrain Pathway in Fear Extinction
… amygdala suppression of firing and diminished fear responses during extinction retrieval. One problem of this model is that it doesn’t incorporate indirect IL communication with the BLA. A key region to help understand how IL modulates extinction is the basal forebrain (BF).</p> <p>The BF both …
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A Novel Naturalistic Paradigm to Study Aerial Predator-Induced Fear
… mammal on Earth. Historically to study fear behavior and avoidance in the rat, laboratories have utilized Classical Conditioning involving an electrical shock (unconditional stimulus) paired with a tone (conditional stimulus). While this has been proven to be a useful paradigm in …
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Dopaminergic modulation of basolateral amygdala for fear extinction
The extinction of conditioned fear responses is crucial for adaptive behavior, and its impairment is a hallmark of anxiety disorders such as post-traumatic stress disorder. During fear extinction learning, a new memory is formed in basolateral amygdala (BLA) reward neurons, which inhibits the BLA …
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Effects of Maternal Stress and Cortisol Treatment on Offspring Anxiety Behaviour and Stress Responses In Zebrafish (Danio rerio) and Largemouth Bass (Micropterus salmoides)
… exhibited greater survival at 1 DPF, a greater fear-related decrease in activity in response to bright light at 6 DPF, and decreased baseline whole-body cortisol content at 0 and 30 DPF. A field experiment with wild largemouth bass (Micropterus salmoides) revealed that maternal cortisol …
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Heart rates in familiar and unfamiliar pairs of young horses and their riders
… was placed in the center of arena to test fear responses in the horses. In this study no difference was found in heart rates of the horses with familiar and unfamiliar riders (T = 0.82, p < .46) neither in behavioural measurements (Z = 37.50, p < .09). The familiarity of the horse didn’t …
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FEAR EXTINCTION AND INFRALIMBIC CORTEX IMPAIRMENT AFTER MILD TRAUMATIC BRAIN INJURY
… A hallmark of these conditions is impaired fear extinction, the process by which learned fear responses are inhibited in safe contexts. This dysfunction contributes to maladaptive fear expression and is linked to altered neurocircuitry, particularly in the infralimbic cortex (IL), a key …
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Pre-Stimulus Anticipation and Unconscious Fear Learning Disparities in Individuals with Varying Levels of Anxiety
… unconscious threat anticipation on subsequent fear responses in associative learning. Additionally, we explored the differences in pre-stimulus anticipation among individuals with varying levels of anxiety. Electrodermal response (EDA) was chosen as a primary measure due to its robustness in …
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Structural and Molecular Correlates of Individual Differences in Anxiety Behavior and the Stress Response
… in brain regions necessary for learning, memory, fear responses, and executive function; the hippocampus, amygdala and medial prefrontal cortex (mPFC). In the following experiments, we measured basal anxiety levels and compared anxiety behavior before and after stress. Individuals were grouped …
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NMDAR-PSD95-nNOS Axis-Mediated Molecular Mechanisms in the Basolateral Amygdala Underlying Fear Consolidation
Fear is an evolutionarily conserved response that can facilitate avoidance learning and promote survival, but excessive and persistent fear responses lead to development of phobias, generalized fear, and post-traumatic stress disorder. The primary goal of experiments in this dissertation is to …
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Characterising trait anxiety in the common marmoset (Callithrix jacchus): investigations into behavioural, psychophysiological and cognitive phenotypes
… individuals display over-generalization of fear responses, a pathogenic marker of elevated trait anxiety in humans, a new aversive discriminative conditioning paradigm was designed. Testing a normal cohort of marmosets revealed that 26% of the animals displayed both behavioural and …
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A Mixed Methods Evaluation of the Effectiveness of a Group Yoga Intervention as an Adjunctive Trauma Therapy for Adolescent Girls
… trauma, leading to difficulty in inhibiting fear responses through cognition (McRae, Ochsner, & Gross 2011). Difficulties associating language with traumatic events have also been found (van der Kolk, 2006). The integration of mindfulness practices and the popularization of yoga in the West …
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