Gradient form and sequential effects during generalization testing in extinction     

Lawrence L. Crawford  Kenneth M. Steele  John C. Malone 《Learning & behavior》1980,8(2):245-252

Four naive pigeons were given six generalization tests in extinction after periods of pretraining in which S+ appeared with food reinforcement and S? appeared in extinction. An analysis of sequential effects among presentations of test stimuli showed that the overall gradient was influenced differently by stimuli at the extremes of the continuum of test stimuli and by S+ and adjacent stimuli. Gradients consisting of responding in each stimulus when it was preceded by an extreme stimulus tended to peak at S+, while gradients produced when each stimulus was preceded by S+ or an adjacent stimulus tended to show a peak shift. This was true whether the overall gradient showed a peak shift or not. Two naive subjects were added and four additional tests were given after pretraining in which unequal frequencies of reinforcement accompanied both S+ and S?. Results of all 10 tests show that sequential effects occur during generalization testing in extinction and that these “local dimensional effects” are unlike local contrast. These stimulus-specific sequential effects may greatly influence overall gradient form.  相似文献   

Motor correlates of ADHD: contribution of reading disability and oppositional defiant disorder   总被引：4，自引：0，他引：4  

Kooistra L  Crawford S  Dewey D  Cantell M  Kaplan BJ 《Journal of learning disabilities》2005,38(3):195-206

This study investigated whether the likelihood of motor impairment in children with attention-deficit/hyperactivity disorder (ADHD) increases with the presence of other disorders, and whether the co-occurring diagnoses of reading disability (RD) and oppositional defiant disorder (ODD) account for the motor deficits seen in ADHD. A total of 291 children (218 boys, 73 girls) participated. Six groups of children were compared: ADHD only (n = 29); RD only (n = 63); ADHD and RD (n = 47); ADHD and ODD (n = 19); ADHD, RD, and ODD (n = 21); and typically developing control children (n = 112). Motor skills were assessed with the Bruininks-Oseretsky Test of Motor Proficiency and the Beery Test of Visual-Motor Integration. We found that the motor skills of the ADHD-only group did not differ from the typical control group. Furthermore, motor impairment in ADHD increased as a function of co-occurring disorders, and the presence of RD rather than ADHD predicted motor impairment.  相似文献   

Second-order sexual conditioning in male Japanese quail (Coturnix japonica)     

Lawrence L. Crawford  Michael Domjan 《Learning & behavior》1995,23(3):327-334

Second-order conditioning of social approach to a female conspecific in male Japanese quail was investigated in four experiments. Subjects that received paired first- and second-order trials acquired second-order conditioning in both Experiments 1 and 2. In contrast, subjects that received paired first-order but unpaired second-order trials, and subjects that received unpaired first-order but paired second-order trials, did not acquire second-order conditioning. In Experiment 3, subjects for whom the first-order conditioned stimulus was presented in extinction showed second-order conditioning comparable to that shown by subjects in a control group that did not receive the extinction procedure. In Experiment 4, subjects approached a second-order stimulus less when sexually satiated than when sexually deprived. These findings suggest that second-order sexual conditioning in quail is mediated by an association of the second-order stimulus with a representation of the unconditioned stimulus.  相似文献   

Extensive reading in English: habits and attitudes of a group of Italian university EFL students     

Belinda Crawford Camiciottoli 《Journal of Research in Reading》2001,24(2):135-153

Although extensive reading is now recognised as an important element of language instruction, it appears that EFL students specialising in business studies do little reading in English beyond course requirements. This study illustrates the findings of a survey of reading frequency and attitudes related to extensive reading in English. A questionnaire administered to 182 Italian EFL students at the University of Florence showed that even if frequency of reading in English is quite low, attitude towards it is clearly favourable. In addition, multiple regression analysis was used to determine potentially influential factors. Reading in Italian and experience abroad were significantly correlated with both reading frequency and attitude. The correlation between past access to English books and reading attitude approached the significance level. A negative correlation was found instead between the number of years of past English study and reading attitude. These findings are useful for defining appropriate instructional actions and identifying areas for further research, with the aim of more effectively promoting extensive reading in English.  相似文献   

Academic artisans in the research university     

Angela Brew  David Boud  Lisa Lucas  Karin Crawford 《Higher Education》2018,76(1):115-127

  相似文献   

Learning to teach science as inquiry in the rough and tumble of practice   总被引：2，自引：0，他引：2  

Barbara A. Crawford 《科学教学研究杂志》2007,44(4):613-642

This study examined the knowledge, beliefs and efforts of five prospective teachers to enact teaching science as inquiry, over the course of a one‐year high school fieldwork experience. Data sources included interviews, field notes, and artifacts, as these prospective teachers engaged in learning how to teach science. Research questions included 1) What were these prospective teachers' beliefs of teaching science? 2) To what extent did these prospective teachers articulate understandings of teaching science as inquiry? 3) In what ways, if any, did these prospective teachers endeavor to teach science as inquiry in their classrooms? 4) In what ways did the mentor teachers' views of teaching science appear to support or constrain these prospective teachers' intentions and abilities to teach science as inquiry? Despite support from a professional development school setting, the Interns' teaching strategies represented an entire spectrum of practice—from traditional, lecture‐driven lessons, to innovative, open, full‐inquiry projects. Evidence suggests one of the critical factors influencing a prospective teacher's intentions and abilities to teach science as inquiry, is the teacher's complex set of personal beliefs about teaching and of science. This paper explores the methodological issues in examining teachers' beliefs and knowledge in actual classroom practice. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 44: 613–642, 2007.  相似文献   

How Valid are the National Board of Professional Teaching Standards Assessments for Predicting the Quality of Actual Classroom Teaching and Learning? Results of Six Mini Case Studies     

Jonelle E. Pool  Chad D. Ellett  Salvatore Schiavone  Charmaine Carey-Lewis 《Journal of Personnel Evaluation in Education》2001,15(1):31-48

Six mini case studies of teachers certified by the National Board of Professional Teaching Standards (NBPTS) were completed using systematic classroom observations, individual teacher interviews, and semi-structured individual and focus group interviews with school site administrators and colleague teachers. Classroom teaching practices of six teachers (2 elementary, 2 middle/Jr. High, 2 High School) in a large southeastern urban district were assessed by two trained observers, and semi-structured interviews with school-site personnel were completed by two additional trained researchers. The findings clearly showed considerable variation among these teachers in the quality of teaching and learning in their daily practices. Two teachers were clearly exemplary, two were rather average, and two were considered rather ineffective in the quality of classroom teaching and learning. Interviews with school-site personnel were somewhat mixed in corroborating findings from actual classroom observations and assessments. Implications of the findings for the validity of NBPTS certification in everyday practice, the meaning of NBPTS certification, and policy decisions such as performance-based pay supplements for NBPTS certified teachers are discussed.  相似文献   

Evaluation of manuscripts in health sciences librarianship.     

S Crawford 《Bulletin of the Medical Library Association》1979,67(4):365-368

  相似文献   

Feminist pedagogy and social change: the impact of the caribbean institute in gender and development     

Charmaine Crawford  Fatimah Jackson-Best 《Gender and education》2017,29(6):709-730

This paper examines the utility of a feminist pedagogical framework in establishing and organising the Caribbean Institute in Gender and Development (CIGAD), which is a biennial intensive gender and development training programme that has taken place in Barbados since 1993. To highlight the major impact that CIGAD has had in educating and empowering Caribbean men and women, the authors will first discuss the importance of feminist pedagogies in teaching, learning and activism in this programme by locating them within an intersectional postcolonial/transnational framework. Secondly, the authors consider the ways in which feminist pedagogy and praxis have been central in training women and men in the Caribbean region in gender analysis, helping them recognise the important role gender plays in development planning and policy as well as how it can be integrated into their work to improve their communities. Finally, through a feminist dialogic, participatory and experiential approach, the authors assess the impact that the CIGAD has had on participants, and community development training will be discussed based on the monitoring and evaluation of the exercise completed in 2014.  相似文献   

Information Warfare: Its Application in Military and Civilian Contexts     

Blaise Cronin  Holly Crawford 《The Information Society》1999,15(4):257-263

  相似文献