The stimulus-response overshadowing phenomenon with VI versus FI schedules of reinforcement     

Roger M. Tarpy  Jean E. Roberts  Stephen E. G. Lea  Marie Midgley 《Learning & behavior》1984,12(1):50-54

Previous research has shown that response rates on a variable interval (VI) schedule of reinforcement decrease if a brief response-produced signal is given prior to reward. One explanation is that the signal overshadows the response because it is a better predictor of reinforcement. The S-R overshadowing effect does not occur with variable ratio (VR) schedules, however. Tarpy, Lea, and Midgley (1983) explained this fact by suggesting that the signal functions to enhance the salience of the temporal interval offset on the VI schedule (a characteristic not possessed by VR schedules), which then overshadows the response. In this experiment, the salience of the temporal interval was enhanced in another way: signaled or unsignaled reward was provided to rats responding on either a VI or fixed interval (FI) reward schedule. As predicted, rates were lowest for animals receiving signaled reinforcement on an FI schedule and highest for those receiving unsignaled reinforcement on a VI schedule.  相似文献   

THE EFFECTIVENESS OF COLOUR IN LEARNING FROM EDUCATIONAL TELEVISION     

Geoffrey Roberts 《Learning, Media and Technology》1978,4(1):21-23

The author reviews recent research comparing both the relative learning gains and relative attitudes of students using colour or monochrome television material. It is concluded that all users of educational television should resist the temptation to spend large sums on colour television equipment merely because colour is now widely preferred by society at large.  相似文献   

Supporting Transgender College Students: Implications for Clinical Intervention and Campus Prevention     

Martin A. Swanbrow Becker  Stacey F. Nemeth Roberts  Sam M. Ritts  William Tyler Branagan  Alia R. Warner  Sheri L. Clark 《Journal of College Student Psychotherapy》2017,31(2):155-176

This study examines the experiences of transgender college students in coping with stress in comparison to their cisgender peers. Undergraduate and graduate students from 73 colleges, totaling 26,292 participants, of which 47 identified as transgender completed an online survey. Transgender students reported greater exposure to trauma and higher rates of suicidal experiences, as well as different precipitants to reported stressful periods and sources of support than their cisgender peers. Implications for individual and group counseling as well as outreach and prevention to better support transgender students are explored.  相似文献   

Pedagogy, Neoliberalism and Postmodernity: Reflections on Freire's later work     

Peter Roberts 《Educational Philosophy and Theory》2003,35(4):451-465

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Risk factors for the perpetration of child sexual abuse: a review and meta-analysis   总被引：1，自引：0，他引：1  

Whitaker DJ  Le B  Karl Hanson R  Baker CK  McMahon PM  Ryan G  Klein A  Rice DD 《Child abuse & neglect》2008,32(5):529-548

OBJECTIVES: Since the late 1980s, there has been a strong theoretical focus on psychological and social influences of perpetration of child sexual abuse. This paper presents the results of a review and meta-analysis of studies examining risk factors for perpetration of child sexual abuse published since 1990. METHOD: Eighty-nine studies published between 1990 and April of 2003 were reviewed. Risk factors were classified into one of the following six broad categories: family factors, externalizing behaviors, internalizing behaviors, social deficits, sexual problems, and attitudes/beliefs. Sex offenders against children (SOC) were compared to three comparison groups identified within the 89 studies: sex offenders who perpetrated against adults (SOA), non-sex offenders, and non-offenders with no history of criminal or sexual behavior problems. RESULTS: Results for the six major categories showed that SOC were not different from SOA (all d between -.02 and .14) other than showing lower externalizing behaviors (d=-.25). Sex offenders against children were somewhat different from non-sex offenders, especially with regard to sexual problems and attitudes (d=.83 and .51). Sex offenders against children showed substantial differences from non-offenders with medium sized effects in all six major categories (d's range from .39 to .58). CONCLUSION: Child sex offenders are different from non-sex offenders and non-offenders but not from sex offenders against adults. PRACTICE IMPLICATIONS: This study suggests that the presence of general risk factors may lead to a variety of negative behavioral outcomes, including the perpetration of child sexual offending. Family factors were strongly related to the perpetration of child sex offending (vs. non-sexual offending or non-offending) and may be valuable intervention points for interrupting the development of child sex offending, as well as other negative behaviors. Other potential points for intervention may focus on the development of appropriate social and emotional skills that contribute to sexual offending.  相似文献   

Long‐Distance and Proximal Romantic Relationship Satisfaction: Attachment and Closeness Predictors     

Amber Roberts  M. Carole Pistole 《Journal of College Counseling》2009,12(1):5-17

Relationship satisfaction was examined in college student long‐distance romantic relationships (LDRRs) and geographically proximal romantic relationships (PRRs). LDRR/PRR attachment style proportions and relationship satisfaction were similar. Multiple regression analyses revealed that low attachment avoidance contributed uniquely to high LDRR satisfaction and that low attachment avoidance, low attachment anxiety, and living apart contributed uniquely to high PRR satisfaction. Relational closeness was not a unique predictor of LDRR or PRR satisfaction.  相似文献   

Tasks, topics and relevance judging for the TREC Genomics Track: five years of experience evaluating biomedical text information retrieval systems     

Phoebe M. Roberts  Aaron M. Cohen  William R. Hersh 《Information Retrieval》2009,12(1):81-97

With the help of a team of expert biologist judges, the TREC Genomics track has generated four large sets of “gold standard” test collections, comprised of over a hundred unique topics, two kinds of ad hoc retrieval tasks, and their corresponding relevance judgments. Over the years of the track, increasingly complex tasks necessitated the creation of judging tools and training guidelines to accommodate teams of part-time short-term workers from a variety of specialized biological scientific backgrounds, and to address consistency and reproducibility of the assessment process. Important lessons were learned about factors that influenced the utility of the test collections including topic design, annotations provided by judges, methods used for identifying and training judges, and providing a central moderator “meta-judge”.  相似文献   

The impact of library services in primary care trusts in NHS North West England: a large‐scale retrospective quantitative study of online resource usage in relation to types of service     

Katherine Bell  Steven William Glover  Colin Brodie  Anne Roberts  Colette Gleghorn 《Health information and libraries journal》2009,26(2):136-142

Background: Within NHS North West England there are 24 primary care trusts (PCTs), all with access to different types of library services. This study aims to evaluate the impact the type of library service has on online resource usage. Methodology: We conducted a large‐scale retrospective quantitative study across all PCT staff in NHS NW England using Athens sessions log data. We studied the Athens log usage of 30 381 staff, with 8273 active Athens accounts and 100 599 sessions from 1 January 2007 to 31 December 2007. Results: In 2007, PCTs with outreach librarians achieved 43% penetration of staff with active Athens accounts compared with PCTs with their own library service (28.23%); PCTs with service level agreements (SLAs) with acute hospital library services (22.5%) and with no library service (19.68%). This pattern was also observed when we looked at the average number of Athens user sessions per person, and usage of Dialog Datastar databases and Proquest full text journal collections. Discussion: Our findings have shown a correlation of e‐resource usage and type of library service. Outreach librarians have proved to be an efficient model for promoting and driving up resources usage. PCTs with no library service have shown the lowest level of resource usage.  相似文献   

‘Please remember we are not all brilliant’: undergraduates’ experiences of an elite,research‐intensive degree at a research‐intensive university     

Susan Howitt  Anna Wilson  Kate Wilson  Pam Roberts 《高等教育研究与发展》2010,29(4):405-420

Undergraduate research experiences are being incorporated into degree programs with increasing frequency. However, there has been little study into their effectiveness in preparing students for research or into the learning gains that students realise from one or more research experiences. We surveyed science students in an elite, research‐based undergraduate degree program at a research‐intensive university. These students complete six research projects during their degree and we aimed to delineate factors that students perceive as leading to either good or bad experiences. Two factors stand out as contributing to a successful research experience: the supervisor, with students reporting both pedagogic and affective benefits of good supervision; and the feeling that they are doing authentic science. Surprisingly, given the research‐intensive nature of this degree, the learning gains students report relate to both an appreciation of what research is like and life skills, such as time management, rather than scientific thinking skills.  相似文献   

Church schools,educational markets and the rural idyll     

Peter J. Hemming  Christopher Roberts 《British Journal of Sociology of Education》2018,39(4):501-517

Researchers have begun to explore the role that faith schools play in contemporary educational markets but the emphasis to date has been on urban rather than rural contexts. This article approaches the issue of marketisation through a qualitative case-study comparison of two Anglican primary schools in contrasting rural localities in England and Wales. Engaging with a range of stakeholders, including parents and pupils, the article explores reasons why the schools were valued, drawing on wider constructions of childhood, religion and rurality. The consequences of the schools’ popularity on factors such as traffic, parking, school ethos and local community ties are also considered. The findings of the study problematise some of the prevalent assumptions about marketisation, including the role of social class and geography in these processes. As such, the article makes an important contribution to the sociological literature on faith schools, rural schools and educational markets.  相似文献