A line- and load-regulated constant-current ac shock generator has been designed for animal behavior experiments. The self-contained unit has four operating modes, amplitude adjustment, and a leakage current detection circuit. A unique feature of this generator is that the good load regulation achieved by using a high-voltage source is preserved without such problems as arcing and high current density effects. Circuit schematics, along with a discussion of selected circuits, are included. Experimental data are presented to demonstrate the utility of the device. 相似文献
The aims of this study were to assess the factor structure, validity, and reliability of the Persian translation of the Toronto Alexithymia Scale-20 (TAS-20) and to examine different models of the TAS-20 in Iranian patients with various psychiatric disorders. Participants were 839 patients with psychiatric disorders, including obsessive-compulsive disorder (OCD) (n = 80), schizophrenia (n = 82), bipolar disorder (BD) (n = 100), alcohol dependence (n = 81), major depressive disorder (MDD) (n = 95), psychosomatic disorders (n = 92), anxiety disorders (n = 85), post-traumatic stress disorder (PTSD) (n = 90), attention deficit hyperactivity disorder (ADHD) (n = 55), and suicide attempts (n = 79). Results indicated that the three-factor TAS-16 fit the data well, after removing four items from the externally-oriented thinking (EOT) subscale. In addition, the total score and subscales had strong internal consistency and concurrent validity. An alternative three-factor model and a four-factor model, which both allow the reverse-coded EOT items to load on a separate factor, also had an acceptable fit. The results suggest that after deleting four items from the EOT subscale, the 16-item TAS is a reliable scale among Iranian psychiatric patients. Moreover, the alternative three-factor and four-factor structures may be appropriate to apply among Iranian patients.
Although many studies have examined gender and racial discrepancies in STEM participation, few have considered variation in the gendered construction of STEM across racial spaces. We applied a cultural psychological perspective to investigate whether variation in conceptions of gender identity across African American and European American settings resonates with variation in gendered constructions of science, technology, engineering, and mathematics (STEM) domains across predominantly white institutions (PWIs) and historically black colleges and universities (HBCUs). We further examined implications of engagement with virtual STEM departments across these school categories. In Study 1, independent coders rated website images as less masculine, and evaluated website climates more favorably, for physics and biology departments at HBCUs relative to PWIs. In Studies 2 and 3, we used these website images as stimuli in within- and between-subjects experiments. Participants gave more positive ratings for sense of belonging and perceived climate in response to images from physics departments at HBCUs than at PWIs; women rated physics departments at PWIs as higher in masculinity than those at HBCUs. We replicated these patterns in Study 3, and also found that lower sense of belonging due to exposure to images from PWI physics departments predicted less interest in pursuing STEM fields among women only. We discuss implications of our findings for understanding and addressing gender discrepancies in STEM participation.
Especial skills are skills that are distinctive by virtue of massive practice within the narrow contexts in which they are expressed. In the first demonstration of especial skills, Keetch, Schmidt, Lee, and Young (2005) showed that experienced basketball players are better at shooting baskets from the foul line, where they had massive amounts of practice, than would expected from their success at other locations closer to or farther from the basket. Similar results were obtained for baseball throwing. The authors asked whether especial skills hold in archery, a sport requiring less movement. If the emergence of especial skills depends on large-scale movement, one would expect archery to escape so-called especialism. But if the emergence of especial skills reflects a more general tendency for highly specific learning, experienced archers should show especial skills. The authors obtained evidence consistent with the latter prediction. The expert archers did much better at their most highly practiced distance than would be expected by looking at the overall function relating shooting score to distance. We offer a mathematical model to account for this result. The findings attest to the generality of the especial skills phenomenon. 相似文献
The growing rate of smoking cigarettes among the youths necessitates examining its contributing factors. Accordingly, we aimed to compare smoking and nonsmoking university students in their attachment styles, perceived loneliness, and psychological well-being. To this end, we recruited 100 current smokers and 100 nonsmoking students by using a convenience sampling method from Shahid Beheshti University, Tehran, Iran. All participants completed the Adult Attachment Scale, Loneliness Scale, and General Health Questionnaire. Data analysis indicated that compared to nonsmokers, smokers had a more anxious attachment style and they felt lonelier. Moreover, current results showed that smokers suffered from higher rates of psychological problems than nonsmokers. These results suggest that smoking is influenced by a set of psychological factors and therefore, prevention and treatment programs targeting these factors may be effective in reducing the rate of smoking cigarettes among university students. 相似文献
This study aimed to determine the factor structure of the spiritual well-being among a sample of the Iranian veterans. In this methodological research, 211 male veterans of Iran–Iraq warfare completed the Paloutzian and Ellison spiritual well-being scale. Maximum likelihood (ML) with oblique rotation was used to assess domain structure of the spiritual well-being. The construct validity of the scale was assessed using confirmatory factor analysis (CFA), convergent validity, and discriminant validity. Reliability was evaluated with Cronbach’s alpha, Theta (θ), and McDonald Omega (Ω) coefficients, intra-class correlation coefficient (ICC), and construct reliability (CR). Results of ML and CFA suggested three factors which were labeled “relationship with God,” “belief in fate and destiny,” and “life optimism.” The ICC, coefficients of the internal consistency, and CR were >.7 for the factors of the scale. Convergent validity and discriminant validity did not fulfill the requirements. The Persian version of spiritual well-being scale demonstrated suitable validity and reliability among the veterans of Iran–Iraq warfare. 相似文献
This study evaluates the safe sex determinants in college students. In the qualitative section, premarital sex, sex with steady
girlfriend and religion’s impact were highlighted. In the quantitative part, the relations between the religiosity score and
past sexual activity, attitude, norms, and self-efficacy with regard to sexual abstinence were investigated. Students who
had a higher religious score were significantly more likely to have high self-efficacy in refusing sex, and their attitudes
supported their abstinence. Additionally, these students were more likely never to have had a sexual relationship. Findings
suggest that greater religious involvement is a protective factor in high-risk sexual behavior.
An erratum to this article can be found at 相似文献
We studied the impact of teachers’ ethical leadership on students’ moral identity and academic citizenship behaviors. Data from 256 student–teacher matching dyads were collected from one of the top 5 Pakistani business schools. Confirmatory factor analysis was used to ensure factorial validity of the measures that were employed, and the hypothesized relationships were tested using structural regression models that utilized structural equation modeling in AMOS with 5,000 bootstrap samples. Based on social learning theory, the results supported the hypothesis that teachers’ ethical leadership had significant direct and indirect positive effects (i.e., through the students’ moral identity) on the students’ academic citizenship behaviors that were directed toward other students and the school. This study contributes to existing literature on ethical leadership and organizational citizenship behavior by highlighting useful implications of these organization-based constructs in an academic context. 相似文献
This phenomenological study examined the potential power of world dance as a therapeutic tool. The lived experiences of adult females (N = 16) were explored to understand the purposive essence of dance and subsequent benefits to mental health. Findings revealed 15 themes in total: 11 themes highlighted potential benefits of world dance, such as social support and stress relief, and four themes noted potential obstacles to using world dance as a therapeutic tool, such as access or finances. Implications for using world dance within creative counseling practice are provided. 相似文献