Stimulus devaluation and extinction of chain schedule performance

Pigeons were trained on a two-component multiple schedule in which each separate component consisted of a three-link chain schedule. After initial baseline training, the stimuli correlated with the terminal links of each chain were presented in a successive discrimination, with one stimulus continuing to be associated with reinforcement while responses to the alternative stimulus were extinguished. Subjects were then returned to the original chain schedule, but with extinction in effect in both components of the multiple schedule. In two separate experiments, extinction of initial-link responding was not affected by which terminal link had been extinguished during the separate discrimination training, indicating that devaluation of the terminal link was not transmitted directly to the initial link of the chain. There was also no effect of the devaluation procedure during the first session of testing on responding in the middle link of the chain, but an effect did develop with continued extinction of the entire chain when the terminal components were presented during extinction. When the terminal components were omitted, however, the latter effect did not occur. Also, when the terminal link was omitted, extinction occurred more rapidly in the middle component than in the initial component, indicating a backward pattern of extinction.     

Cooperation in Teacher Education in the European Community

During 1977, the Commission of the European Communities offered for the first time a limited number of grants for short study visits in member states. These grants were introduced to enable teaching and administrative staff and researchers to undertake studies of aspects of the organization and administration of European Community higher education institutions. The central intention was the promotion of cooperation. This paper describes the strategies adopted in operating a study visit programme involving one institution in the United Kingdom and fourteen institutions in six member states of the European Community, i.e. Belgium, Denmark, France, Holland, Italy and West Germany, and presents an interim evaluation of the outcomes of this project.     

Engineering Education as the Development of Critical Sociotechnical Literacy

Science & Education - Recent policy documents position engineering as a way to broaden participation for students in STEM fields. However, a recent review of the literature on engineering...     

The question of sign-language and the utility of signs in the instruction of the deaf: two papers by Alexander Graham Bell (1898)

Alexander Graham Bell is often portrayed as either hero or villain of deaf individuals and the Deaf community. His writings, however, indicate that he was neither, and was not as clearly definite in his beliefs about language as is often supposed. The following two articles, reprinted from The Educator (1898), Vol. V, pp. 3-4 and pp. 38-44, capture Bell's thinking about sign language and its use in the classroom. Contrary to frequent claims, Bell does not demand "oral" training for all deaf children--even if he thinks it is the superior alternative--but does advocate for it for "the semi-deaf" and "the semi-mute." "In regard to the others," he writes, "I am not so sure." Although he clearly voices his support for oral methods and fingerspelling (the Rochester method) over sign language, Bell acknowledges the use and utility of signing in a carefully-crafted discussion that includes both linguistics and educational philosophy. In separating the language used at home from that in school and on the playground, Bell reveals a far more complex view of language learning by deaf children than he is often granted. (M. Marschark).     

Two-choice,observational learning and reversal in the rat: S-S versus S-R effects

In Experiment 1, male rats were trained to press both bars in a two-choice apparatus and were then given observational training of a go/no-go discrimination in which the observed operation of two inaccessible, dissimilar bars by a hidden experimenter constituted S+ and S?. After discrimination was established, individual rats were permitted access to the two bars. Six of the seven rats consistently pressed the S+ bar on 10 test trials, but failed to reverse bar preference after observational training was reversed. In Experiment 2, nine naive males received the same observational training as in Experiment 1, but without any pretraining to press either bar. All rats pressed the S+ bar on initial test and did so consistently throughout the 10 trials. Six of these rats received reversal training of the go/no-go discrimination after the 10 test trials. As in Experiment 1, all rats failed to press the new S+ bar. However, five of six rats in another group, which received reversal trainingprior to any test trials, did reverse and press the new S+ bar. In Experiment 3, controls for possible confounding effects of overtraining trials were conducted. These manipulations had no effect; the rats tested before reversal still failed to press the S+ bar, and the rats reversed before testing all reversed or pressed the most recent S+ bar. That is, S-R learning predominated over S-S learning if active, though unreinforced, responding to a particular bar intervened. In contrast, however, a cognitive (S-S) interpretation of directed response learning was supported by the results of Experiment 4, in which the rats that learned the go/no-go discrimination without responding (only by auditory and light cues) failed to press the S+ bar consistently.     

Designing for expansive science learning and identification across settings

In this study, we present a case for designing expansive science learning environments in relation to neoliberal instantiations of standards-based implementation projects in education. Using ethnographic and design-based research methods, we examine how the design of coordinated learning across settings can engage youth from non-dominant communities in scientific and engineering practices, resulting in learning experiences that are more relevant to youth and their communities. Analyses highlight: (a) transformative moments of identification for one fifth-grade student across school and non-school settings; (b) the disruption of societal, racial stereotypes on the capabilities of and expectations for marginalized youth; and (c) how youth recognized themselves as members of their community and agents of social change by engaging in personally consequential science investigations and learning.     

Identified spouse abuse as a risk factor for child abuse

CONTEXT: There are limited data on the extent to which spouse abuse in a family is a risk factor for child abuse. OBJECTIVE: To estimate the subsequent relative risk of child abuse in families with a report of spouse abuse compared with other families. DESIGN: Cohort study. SETTING: Analysis of a centralized US Army database PARTICIPANTS: Married couples with children with at least one spouse on active duty in the US Army during 1989-95. MAIN OUTCOME MEASURES: The US Army Family Advocacy Program's Central Database was used to identify child and spouse abuse. The exposure was an episode of identified spouse abuse and the main outcome was a substantiated episode of subsequent child abuse.RESULTS: During the study period of an estimated 2,019,949 person years, 14,270 incident child abuse cases were substantiated. Families with an incident case of spouse abuse identified during the study period were twice as likely to have a substantiated report of child abuse compaired with other military families, rate ratio, 2.0, (95% confidence interval [CI] 1.9-2.1). Young parental age had the highest rate ratio, 4.9 (95% CI 4.5-5.3) in the subgroup analysis controlling for rank. Identified spouse abuse was associated with physical abuse of a child, rate ratio 2.4 (95% CI 2.2-2.5), and with sexual abuse of a child, rate ratio 1.5 (95% CI 1.3-1.7). Identified spouse abuse was not associated with child neglect or maltreatment, rate ratio, 1.0 95% CI 0.9-1.1) CONCLUSION: An identified episode of spouse abuse in a family appears to be associated with an increased risk of subsequent child abuse and serves as an independent risk factor. Therefore. care providers should consider the potential risk to children when dealing with spouse abuse.     

Gestalt imagery: A critical factor in language comprehension

Gestalt imagery—the ability to create imaged wholes—is a critical factor in oral and written language comprehension. Despite good decoding, good vocabulary, and adequate background experiences, many individuals experience weak gestalt imagery, thus processing “parts” rather than “wholes,” from verbal stimuli, spoken or written. This contributes to a Language Comprehension Disorder that may be accompanied by a commonality of symptoms: weak reading comprehension, weak oral language comprehension, weak oral language expression, weak written language expression, difficulty following directions, and a weak sense of humor. Sequential stimulation using an inquiry technique develops gestalt imagery and results in significant improvement in reading comprehension.     

Cinderella in the Classroom. Children's Responses to Gender Roles in Fairy‐tales

The project described in this paper was designed to test the feminist hypothesis that the Cinderella‐style fairy‐tales promoted by Anglo‐American society harmfully reinforce restrictive images of girlhood and womanhood. The research was based on work with over 100 boys and girls aged 9‐11 in five Cornish primary schools. Responses came from the children through group discussion, drawing pictures and writing stories. Although the figure of the pretty princess predominated in the girls’ pictures, it was apparent through the children's discussion and stories that few girls identified with this image. The girls favoured ‘upside‐down’ fairy‐tale scenarios that gave their heroines independence, while the boys clung to the traditional image of the prince for the same reason. These results indicate that girls of this age are ‘resisting readers’, able to criticise and manipulate — as well as enjoy — the gender images presented to them in the dominant fairy‐tales of our culture.     

Double Visions: Educational Technology in Standards and Assessments for Science and Mathematics

For educational technology integration in content disciplines to succeed, teachers and teacher educators need clear standards delineating why, how, where, and how much educational technology they should include in their teaching. This paper examines the visions offered by current science, mathematics, and educational technology standards for educational technology integration in K-12 schools. Since national assessments exert a profound influence on what teachers and students choose to teach and learn, the vision of educational technology use supported by national assessments is also examined. The National Council of Teachers of Mathematics Standards (NCTM, 2000. Principles and Standards for School Mathematics. Retrieved April 6, 2002 from http://standards.nctm.org), the National Science Education Standards (National Research Council (NRC) 1996. National Science Education Standards. Available at http://books.nap.edu/catalog/4962.html), and the National Educational Technology Standards (International Society for Technology in Education (ISTE) 2000. National Educational Technology Standards for Students: Connecting Curriculum and Technology, ISTE, Eugene, Oregon) provide different visions of educational technology use in the classroom. In addition, the current technology use policies for national assessments in science and mathematics, in particular the college admission tests (ACT, SAT I and SAT II subject area tests), Advanced Placement (AP) course assessments, and the Praxis Series assessments indicate that while mathematics assessments often recommend or require the use of educational technology, few science assessments permit the use of educational technology by students. Recommendations are offered for science educators regarding teacher preparation for the technology-rich classrooms of the future.