University of North Texas

About: University of North Texas is a education organization based out in Denton, Texas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 11866 authors who have published 26984 publications receiving 705376 citations. The organization is also known as: Fight, North Texas & UNT.

Hippocampal volume and memory performance in a community‐based sample of women with posttraumatic stress disorder secondary to child abuse

Abstract: Childhood abuse is linked to posttraumatic stress disorder (PTSD), which follows abuse survivors into adulthood. This study identified the neuropsychological and neuromorphological sequelae of PTSD among prepubescently abused women. Right-handed women aged 20-40 years were placed into PTSD and abuse, abuse only, and normal control groups (n = 17 per group). Participants were screened for trauma history and psychiatric symptoms, demographically matched, and given neuropsychological tests and a magnetic resonance scan of their brain. Women with PTSD did not express significant deficits in memory performance or hippocampal volume when compared with the abuse and normal control groups.

Metacontingencies in Walden Two

Abstract: I distinction is made between contingencies of reinforcement (contingent relations between a class of responses and a common consequence) and metacontingencies (contingent relations between a class of operants and a long-term cultural outcome). The fictional utopia portrayed in Walden Two is examined in terms of the kinds of metacontingencies characteristic of that culture. It is suggested that if a culture is to approximate utopia, attention must be paid to the metacontingencies and to their supporting contingencies of reinforcement.

The energetic costs of tail autotomy to reproduction in the lizard Coleonyx brevis (Sauria: Gekkonidae).

Abstract: Energy reserve utilization and energy budgets were compared in tailed and tailless adult female Coleonyx brevis. Carcass, fat body and caudal energy reserves were used for vitellogenesis; mass and energy content (cal/mg and/or cal/reserve) of each were significantly lower at oviposition than at the initiation of vitellogenesis. Total energy reserves accounted for 53% of the reproductive energy investment in tailed females compared to 29% in tailless females. Tailed females had over twice as many reserve calories for egg production than tailless females. Caudal energy reserves represented 60% of the total reserves of tailed females and were one-third greater than the total energy reserves of tailless females. To produce a clutch of eggs both tailed and tailless females supplemented energy reserves with net metabolizable energy that was available after metabolic costs were paid. Tailless females had a significantly greater rate of food ingestion and more net metabolizable energy available for reproduction than tailed females, yet allocated significantly fewer calories/day to reproduction than tailed females, primarily because of the loss of caudal reserves. Reproductive efforts of tailed and tailless females were equivalent. However, the loss of caudal reserves resulted in the production of eggs that were significantly lower in mass and energy content (cal/mg and cal/egg) than when caudal reserves were used. Results empirically support the hypothesis that reproduction has energetic priority over tail regeneration in short-lived, iteroparous species with a low probability of future reproductive success.

Why people do what they do to protect against earthquake risk: perceptions of hazard adjustment attributes.

Abstract: This study examined respondents' self-reported adoption of 16 hazard adjustments (preimpact actions to reduce danger to persons and property), their perceptions of those adjustments' attributes, and the correlations of those perceived attributes with respondents' demographic characteristics. The sample comprised 561 randomly selected residents from three cities in Southern California prone to high seismic risk and three cities from Western Washington prone to moderate seismic risks. The results show that the hazard adjustment perceptions were defined by hazard-related attributes and resource-related attributes. More significantly, the respondents had a significant degree of consensus in their ratings of those attributes and used them to differentiate among the hazard adjustments, as indicated by statistically significant differences among the hazard adjustment profiles. Finally, there were many significant correlations between respondents' demographic characteristics and the perceived characteristics of hazard adjustments, but there were few consistent patterns among these correlations.

A field study of a cognitive approach to understanding transformational and transactional leadership

Abstract: A part of the cognitive model of transformational and transactional leadership proposed by Wofford and Goodwin (1994) was examined in a field setting. Ninety-six managers and 157 subordinates completed questionnaires that assessed transformational leadership and transactional leadership dimensions, four cognitive variables (i.e., follower-schemata, motivation-scripts, abstractness of vision, and idealization of vision) and three dependent variables (i.e., subordinate satisfaction with supervision, subordinate perception of leader effectiveness, and leaders' evaluation of group effectiveness). Partial Least Squares (PLS) analyses indicated that the data generally supported the hypothesized model. Some of the proposed relationships examined, however, were not statistically significant. Implications of the findings for application and future research were discussed.