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This study examined the effects of race-related stressors and hostility on cardiovascular reactivity in 31 African American and 31 Caucasian men. Participants viewed 3 film excerpts that depicted neutral, anger-provoking (but race-neutral), and racist situations. Participants exhibited significantly greater diastolic blood pressure reactivity to anger-provoking and racist stimuli compared with neutral stimuli. In addition, high hostility was associated with higher recovery systolic and diastolic blood pressure levels after exposure to the films. Although the results failed to confirm previous reports of greater reactivity to racism in African Americans, the findings suggest that diastolic blood pressure levels may remain elevated after exposure to racist stimuli. These results indicate that even indirect exposure to interpersonal conflict elicits significant reactivity, which can persist after exposure to the stressor, especially among high-hostile men. 相似文献
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Tara Carney Kim Johnson Adam Carrico Bronwyn Myers 《International journal of psychology》2020,55(6):1016-1025
Substance use is prevalent among South African adolescents, but few interventions exist to reduce risk of harm. This study assesses the feasibility, acceptability and preliminary effects of a brief intervention for reducing adolescent substance use and other risk behaviours. This single-arm feasibility test recruited 30 substance-using adolescents and their primary caregiver. Participants received separate interventions (2 sessions for adolescents, 1 session for caregivers), with a subsample randomly selected for post-intervention interviews. Feasibility was measured by the proportion of eligible adolescents who were enrolled and retained in the study. Interviews explored acceptability, and changes in outcomes from baseline to 1-month follow-up assessed preliminary effects of the intervention. Thirty of 43 (69.8%) eligible adolescents and their caregivers were enrolled, with 29 adolescents (96.7%) and 28 caregivers (93.3%) completing the intervention. Twenty-eight adolescents (93.3%) and 29 caregivers (96.7%) were retained at follow-up. Frequency of alcohol, cannabis use and delinquent-type behaviours decreased significantly from baseline to follow-up. Participants appreciated the intervention content and delivery and felt that it facilitated behaviour change. Suggestions for improving the intervention were provided. This study found that the intervention is feasible, acceptable and had promising effects on adolescent behaviour. Efficacy must be established with a randomised controlled trial. 相似文献
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Ahmed A. Moustafa Szabolcs Keri Mohammad M. Herzallah Catherine E. Myers Mark A. Gluck 《Brain and cognition》2010
Building on our previous neurocomputational models of basal ganglia and hippocampal region function (and their modulation by dopamine and acetylcholine, respectively), we show here how an integration of these models can inform our understanding of the interaction between the basal ganglia and hippocampal region in associative learning and transfer generalization across various patient populations. As a common test bed for exploring interactions between these brain regions and neuromodulators, we focus on the acquired equivalence task, an associative learning paradigm in which stimuli that have been associated with the same outcome acquire a functional similarity such that subsequent generalization between these stimuli increases. This task has been used to test cognitive dysfunction in various patient populations with damages to the hippocampal region and basal ganglia, including studies of patients with Parkinson’s disease (PD), schizophrenia, basal forebrain amnesia, and hippocampal atrophy. Simulation results show that damage to the hippocampal region—as in patients with hippocampal atrophy (HA), hypoxia, mild Alzheimer’s (AD), or schizophrenia—leads to intact associative learning but impaired transfer generalization performance. Moreover, the model demonstrates how PD and anterior communicating artery (ACoA) aneurysm—two very different brain disorders that affect different neural mechanisms—can have similar effects on acquired equivalence performance. In particular, the model shows that simulating a loss of dopamine function in the basal ganglia module (as in PD) leads to slow acquisition learning but intact transfer generalization. Similarly, the model shows that simulating the loss of acetylcholine in the hippocampal region (as in ACoA aneurysm) also results in slower acquisition learning. We argue from this that changes in associative learning of stimulus–action pathways (in the basal ganglia) or changes in the learning of stimulus representations (in the hippocampal region) can have similar functional effects. 相似文献
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