Extinction produces context inhibition and multiple-context extinction reduces response recovery in human predictive learning

Two experiments with human participants were used to investigate recovery of an extinguished learned response after a context change using ABC designs. In an ABC design, the context changes over the three successive stages of acquisition (context A), extinction (context B), and test (context C). In both experiments, we found reduced recovery in groups that had extinction in multiple contexts, and that the extinction contexts acquired inhibitory strength. These results confirm those of previous investigations, that multiple-context extinction can produce less response recovery than single-context extinction, and they also provide new evidence for the involvement of contextual inhibitory processes in extinction in humans. The foregoing results are broadly in line with a protection-from-extinction account of response recovery. Yet, despite the fact that we detected contextual inhibition, predictions based on protection-from-extinction were not fully reliable for the single- and multiple-context group differences that we observed in (1) rates of extinction and (2) the strength of context inhibition. Thus, although evidence was obtained for a protection-from-extinction account of response recovery, this account can not explain all of the data.     

Telecommunications

MISUNDERSTANDING MEDIA by Brian Winston (New York: Oxford University Press, 1986---$22.50)

SERVICES IN TRANSITION: THE IMPACT OF INFORMATION TECHNOLOGY ON THE SERVICE SECTOR edited by Gerald Faulhaber, et al. (Cambridge, MA: Ballinger, 1986---$29.95)

BUSINESS TELEMATICS: CORPORATE NETWORKS FOR THE INFORMATION AGE by Byron Belitsos and Jay Misra (Homewood, IL: Dow, Jones-Irwin, 1986---$25.00)

COMPUTER & TELECOMMUNICATIONS ACRONYMS edited by Julie Towell and Helen Sheppard (Detroit: Gale Research, 1986---$60.00)

Three recent publications from the Program on Information Resources Policy (200 Aiken, Harvard University, Cambridge, MA 02138---inquire of publisher for prices, paper)

COMPUTER III: A NEW ERA—A GUIDE TO THE FCC'S LANDMARK DEREGULATORY RULING edited by Dick Stirba (Telecom Publishing Group, Capitol Publications, 1101 King St., Alexandria, VA 22314---$140, paper)

MARKET AND STRATEGIC IMPACTS OF BYPASS by the Bethesda Research Institute (Phillips Publishing, 7811 Montrose Rd., Potomac, Md. 20854---price not given, paper)

SATELLITE COMMUNICATION SYSTEMS ENGINEERING by Wilbur Pritchard and Joseph Sciulli (Englwood Cliffs, NJ: Prentice-Hall, 1986---$42.95)

GUIDE TO SATELLITE TELEVISION INSTALLATION by John E. Traister (Englewood Cliffs, NJ: Prentice-Hall, 1986---$24.95)     

Negative video as structure: Emotion,attention, capacity,and memory

This paper uses a limited capacity information processing theory of television viewing to investigate the effects of graphic negative video at four levels of processing (attention, capacity, encoding, and retrieval) and on two dimensions of emotional experience (arousal and valence). Results indicate that the presence of negative video in news stories increases attention, increases the amount of capacity required to process the message, increases the ability to retrieve the story, facilitates recognition of information presented during the negative video and inhibits recognition for information presented before the negative video. Results also indicate that the introduction of negative video increases the self‐reported negative emotional impact of the story — making it more arousing and more negative.     

The Fate of Early Experience Following Developmental Change: Longitudinal Approaches to Individual Adaptation in Childhood

2 strategies were used to investigate the continued impact of early experience and adaptation given subsequent experience and/or developmental change in a poverty sample (N = 190). Groups were defined whose adaptation was similar during the preschool years but consistently different earlier; then these 2 groups were compared in elementary school. In addition, a series of regression analyses was performed in which variance accounted for by near-in or contemporary predictors of adaptation in middle childhood was removed before adding earlier adaptation in subsequent steps. Children showing positive adaptation in the infant/toddler period showed greater rebound in the elementary school years, despite poor functioning in the preschool period. Regression analyses revealed some incremental power of early predictors with intermediate predictors removed. The results were interpreted as supporting Bowlby's thesis that adaptation is always a product of both developmental history and current circumstances. While this research cannot resolve such a complicated issue, it does point to the need for complex formulations to guide research on individual development.     

Selective attention of impulsive and reflective children

Kagan's Matching Familiar Figures Test was used to select 36 impulsive and 36 reflective children at each of three grade levels: kindergarten, second, and fifth. An incidental learning paradigm was used to assess the child's recall of central and incidental information. Reflective subjects recalled more central and incidental information than impulsives, suggesting that impulsives have difficulty encoding information for storage. Central recall increased with grade level but incidental learning remained constant, a finding consistent with the developmental trend found in previous investigations. A task order effect was found in the recall of central information with more errors made when the central recall task was presented after the incidental. This order effect may account for the higher central recall scores found in previous investigations. Other problems with the incidental learning paradigms raise questions about the validity of the task for inferring selective attention. Despite the problems associated with the task, the results offer further evidence to support the notion that impulsive and reflective children differ on dimensions other than response latency.     

The microeconomics of the allocation of teachers' time and student learning

The authors use a microeconomic theory of schools and highly detailed panel data on time allocations to examine student learning curves for reading and mathematics. In addition to examining the factors that affect student achievement, they investigate the role teachers' values play in allocating scarce learning time to students, and the subsequent effects on the distribution of learning across those students. They test hypotheses about the productivity of teachers in teaching mathematics and reading, whether marginal products vary across a sample of teachers, and whether the marginal products of time in alternate types of classroom organization significantly differ. The authors' findings are consistent with the view that more time on a subject does increase learning, but suggest that the size of the effects is small and subject to diminishing returns. With respect to teacher preferences, the results show that teachers in the sample overwhelmingly employed compensating strategies in allocating resources to the students. Teachers tend to prefer narrower distributions of learning across students than wider ones.     

The role of Aboriginal literacy in improving English literacy in remote Aboriginal communities: an empirical systems analysis with the Interplay Wellbeing Framework

Indigenous language endangerment is critical in Australia, with only 120 of 250 known languages remaining, and only 13 considered strong. A related issue is the gap in formal education outcomes for Aboriginal and Torres Strait Islander people compared with other Australians, with the gap wider in remote regions. Little empirical research exists in Australia to explore the role of developing Aboriginal literacy through bilingual education to address these combined issues. As a ‘shared space’ collaboration between remote communities, government, and scientists, the Interplay Wellbeing Framework and associated Survey were designed to represent community values and priorities in a quantifiable system to inform policy and practice. A cohort of 842 Aboriginal people aged 15–34 years from four remote communities completed individual surveys designed and administered by Aboriginal community researchers. We applied structural equation modelling to this data to understand the role of cultural indicators on education outcomes. Results confirmed the importance of strong relationships between community and schools. Furthermore, learning about culture and learning literacy in ones first language in schools to develop Aboriginal literacy, is established as a necessary step to improve English literacy in remote schools. This suggests bilingual education and strengthening culture and community involvement in schools are necessary to improve both education outcomes and language preservation.