Tracking of the expected time to reinforcement in temporal conditioning procedures

In one experiment, the rate and pattern of responding (head entry into the food cup) under different distributions of intervals between food deliveries were examined. Separate groups of rats received fixed-time (45, 90, 180, or 360 sec), random-time (45, 90, 180, or 360 sec), or tandem fixed-time (45 or 90 sec) random-time (45 or 90 sec) schedules of reinforcement. Schedule type affected the pattern of responding as a function of time, whereas mean interval duration affected the mean rate of responding. Responses occurred in bouts with characteristics that were invariant across conditions. Packet theory, which assumes that the momentary probability of bout occurrence is negatively related to the conditional expected time remaining until the next reinforcer, accurately predicted global and local measures of responding. The success of the model advances the prediction of multiple measures of responding across different types of time-based schedules.     

Experiences of HIV/AIDS Counselors in Zimbabwe and Their Perceptions on the State of HIV/AIDS Counseling in Zimbabwe

This study investigated Zimbabwean counselors' experiences of providing HIV/AIDS counseling and their perceptions about the state of HIV/AIDS counseling in Zimbabwe. The participants were a diverse group of counselors, 30 through 59 years of age, who provided counseling services to HIV/AIDS clients. Participants thought HIV/AIDS counselors in Zimbabwe received minimal support and supervision and were undertrained. They identified that the first sessions with clients were the most difficult. They also found it problematic to work with couples who were serodiscordant (one partner who is HIV positive and the other HIV negative) and couples wanting children. The later stages of the counseling process were also found to be challenging. Though the participants acknowledged they had negative psychological experiences when counseling HIV/AIDS clients, they also expressed feelings of satisfaction and fulfillment in their work.     

A meta-analysis of the relationship of child sexual abuse to HIV risk behavior among women

OBJECTIVE: This study is a meta-analysis of the literature exploring the relationship between child sexual abuse (CSA) and HIV risk behavior among women. Four outcome variables were tested: unprotected sex; sex with multiple partners; sex trading; and adult sexual revictimization. METHOD: Forty-six studies met the inclusion criteria and were included in the analysis, and separate meta-analyses were performed for each of the four dependent variables described above. RESULTS: Using the correlation coefficient r as an effect size estimate, results indicate an average effect size of .05 for the unprotected sex meta-analysis (N = 16 studies), .13 for the sex with multiple partners meta-analysis (N = 23 studies), .12 for the sex trading meta-analysis (N = 23 studies), and .17 for the adult sexual revictimization meta-analysis (N = 21 studies). We conducted a test of three potential moderator variables (source of sample, definition of CSA based on type of contact, and definition of CSA based on maximum age of victim). Results did not support the hypothesis that these three variables explain a significant amount of variability in effect sizes with one exception: Studies that define CSA more broadly to include adolescent victims (e.g., victims up to 17 years of age) had larger and more homogenous effect sizes for the sex trading meta-analysis than those that defined CSA as having occurred at younger ages. CONCLUSIONS: These findings suggest a small positive relationship between CSA and subsequent HIV risk behavior among women that varies as a function of how CSA and HIV risk behavior are operationalized.     

One Cow Does Not an Animal Make: Young Children Can Extend Novel Words at the Superordinate Level

Six match-to-sample picture/object selection experiments were designed to explore children's knowledge about superordinate words (e.g., "food") and how they acquire this knowledge. Three factors were found to influence the learning and extension of superordinate words in 3- to 5-year-old children (N = 230): The number of standards (one versus two), the type of standards presented (from different basic-level categories versus from the same basic-level category), and the nature of the object representations used (pictures versus objects). A different pattern of superordinate word acquisition was found between 3-year-olds and 4- and 5-year-olds. Although 4- and 5-year-olds could learn and extend novel words to superordinate categories in the presence of two picture exemplars from different categories or a single three-dimensional (3-D) exemplar, 3-year-olds could do so only in the presence of two 3-D exemplars. These findings indicate that young children's acquisition of superordinate words is influenced by multiple factors and that there is a developmental progression from multiple exemplars to single exemplars in superordinate word learning.     

Individual and group meaning‐making in an urban third grade classroom: Red fog,cold cans,and seeping vapor

We examined third graders' understandings of condensation using an expanded notion of the Emergent Perspective, a reflexive consideration of individual and group meaning‐making situated in the culture of the classroom. Data were collected from two small groups of students in an inquiry‐based, urban classroom during a unit on the water cycle. Measures included conceptual pre‐/posttests, interviews, written work, and discourse analyses of a science lesson. Although we identified the supportive role of the teacher's explicit assessments of children's ideas, within the small groups, the force that most potently shaped meaning‐making was students' persuasive power, which was in part influenced by the rhetorical moves employed. Specifically, students' evaluative comments (a type of rhetorical move) about contributions of other group members seemed to be particularly persuasive in these groups. Evaluative comments, apart from students' academic status, were shown to be an important influence in not only social knowledge production but also in individual internalization. Our explanation focuses on the particular discursive practices as intellectual resources of urban students, but we are also mindful of the cognitive complexity of the material and the developmental abilities of the students. © 2005 Wiley Periodicals, Inc. J Res Sci Teach 42: 1032–1061, 2005     

Evaluation of a Statewide Science Inservice and Outreach Program: Teacher and Student Outcomes

Journal of Science Education and Technology -     

Healthy Families New York (HFNY) randomized trial: effects on early child abuse and neglect

OBJECTIVE: To evaluate the effects of a home visiting program modeled after Healthy Families America on parenting behaviors in the first 2 years of life. METHODS: A sample of 1173 families at risk for child abuse and neglect who met the criteria for Healthy Families New York (HFNY) was randomly assigned to either an intervention group that was offered HFNY or a control group that was given information and referrals to other services. Data were collected through a review of CPS records, and maternal interviews at baseline and the child's first birthday (90% re-interviewed) and second birthday (85% re-interviewed). RESULTS: HFNY mothers reported committing one-quarter as many acts of serious abuse at age 2 as control mothers (.01 versus .04, p<.05). Two sets of interactions were tested and found to have significant effects (p<.05). At age 2, young, first-time mothers in the HFNY group who were randomly assigned at 30 weeks of pregnancy or less were less likely than counterparts in the control group to engage in minor physical aggression in the past year (51% versus 70%) and harsh parenting in the past week (41% versus 62%). Among women who were "psychologically vulnerable," HFNY mothers were one-quarter as likely to report engaging in serious abuse and neglect as control mothers (5% versus 19%) at age 2. CONCLUSIONS: These findings suggest that who is offered home visitation may be an important factor in explaining the differential effectiveness of home visitation programs. Improved effects may be realized by prioritizing the populations served or by enhancing the model to meet program objectives for hard-to-serve families.     

Investigation of science faculty with education specialties within the largest university system in the United States

Efforts to improve science education include university science departments hiring Science Faculty with Education Specialties (SFES), scientists who take on specialized roles in science education within their discipline. Although these positions have existed for decades and may be growing more common, few reports have investigated the SFES approach to improving science education. We present comprehensive data on the SFES in the California State University (CSU) system, the largest university system in the United States. We found that CSU SFES were engaged in three key arenas including K-12 science education, undergraduate science education, and discipline-based science education research. As such, CSU SFES appeared to be well-positioned to have an impact on science education from within science departments. However, there appeared to be a lack of clarity and agreement about the purpose of these SFES positions. In addition, formal training in science education among CSU SFES was limited. Although over 75% of CSU SFES were fulfilled by their teaching, scholarship, and service, our results revealed that almost 40% of CSU SFES were seriously considering leaving their positions. Our data suggest that science departments would likely benefit from explicit discussions about the role of SFES and strategies for supporting their professional activities.     

Using collaborative two‐stage examinations to address test anxiety in a large enrollment gateway course

Large enrollment foundational courses are perceived as “high stakes” because of their potential to act as barriers for progression to the next course or admittance to a program. The nature of gateway courses makes them ideal settings to explore the relationship between anxiety, pedagogical interventions, and student performance. Here, two‐stage collaborative examinations were implemented to improve test‐taking skills and address widespread test anxiety in an introductory human anatomy course. Test anxiety data were collected (using the Motivated Strategies for Learning Questionnaire) before the first examination and last examination. Most students experienced decreased test anxiety over the course of the semester; however, some students may have experienced performance limiting conditions due to test anxiety at the end of the semester based on academic ability in the course (in “C” students when compared to “A” students: P < 0.00006 and “B” students: P < 0.05), overall academic ability (in academically weaker students: P < 0.025), and demographic factors (in women: P < 0.025). The strongest performances on examinations were primarily observed in already academically strong students (mean individual performance: P < 0.000, mean group performance: P < 0.000). Furthermore, changes in test anxiety were not significantly associated with the group portion of the examinations. Patterns of changes in test anxiety over the course of the semester underscore a complex interaction between test anxiety, student background, and student performance. Results suggest that pathways for test anxiety in “high stakes” courses may be separate from the mechanisms responsible for the benefits of collaborative testing. Anat Sci Educ 10: 409–422. © 2017 American Association of Anatomists.