Effects of varying sucrose reinforcers and amobarbital sodium on positive contrast in rats

The effect of quantity and quality of reinforcement on performance change following a shift to uniform high reward was studied in four groups of rats. Twenty or 200 licks of a 5% or 20% sucrose solution constituted the four incentive conditions. Two additional subject groups were run in the high (20%–200 licks) and low (5%-20 licks) reward conditions to determine how amobarbital sodium, an emotional depressant, influences incentive shift performance. All six groups received 60 preshift runway trials (6/day), followed by 30 high reward trials. Twenty-four extinction trials contrasted drugged and normal performance relating to high and low reward Postshift positive contrast appeared in all nondrugged groups. An emotional base for positive contrast is considered.     

Religious justification,elitist outcome: are religious schools being used to avoid integration?

Despite ongoing efforts to promote ethnic, racial and socio-economic integration, segregation continues to challenge education administrators and legal scholars. Privileged parents seeking to avoid integration employ various strategies such as attending private schools or buying houses in neighbourhoods with good school. This paper offers a combined empirical and legal research of another such strategy: the resort to religious schools. The research is conducted within one specific context, that of Israeli Religious State Schools. The empirical study examines whether “Torani” religious state schools (a category of religious schools that offer enhanced Jewish studies and a strict religious environment) induce socio-economic segregation. The findings indicate that “Torani” schools are indeed socio-economically segregated and serve children from higher socioeconomic class than regular religious state schools. It also shows that “Torani” schools are less reflective of their surroundings than regular religious state schools, and are more likely to be established by privileged parents in poor areas, where they are dissatisfied with the local state schools. The legal research offers an explanation of how legal regulation can determine whether religious schools will become a means for avoiding integration. Specifically, it points to three areas in which “Torani” schools are regulated differently than regular religious state schools – the rules regarding the establishment of new schools; the rules concerning school funding; and the rules concerning student enrolment – and argues that special treatment meant to protect religious interests is responsible for making “Torani” schools socially segregated.     

Hope,optimism and loneliness among first-year college students with learning disabilities: a brief longitudinal study

The goals of the study were to examine personal resources and social distress during the first month in college among students with learning disabilities (LD) and to compare their experiences with non-LD peer. The sample consisted of 335 first-year undergraduate students falling into two groups: 85 students with LD and 250 non-LD students. Questionnaires assessed hope, dispositional optimism and loneliness. We hypothesised that, after participation in a single-session hope intervention workshop, the hope and optimism levels of both students with LD and without LD would increase, while their loneliness would decrease. However, after a month of facing the academic and social demands of their new college environment, we expected that the hope and optimism scores of students with LD would be lower than their peers without LD and that their loneliness scores would be higher. As hypothesised, both groups reported enhanced hope and optimism, as well as lower loneliness, immediately after the workshop. However, students with LD – but not their peers – returned to baseline levels of hope and loneliness after a month. Loneliness after a month predicted lower hope, after controlling predictors from the beginning of the year.     

A study of the integration of passage-, document-, and cluster-based information for re-ranking search results

Cluster-based and passage-based document retrieval paradigms were shown to be effective. While the former are based on utilizing query-related corpus context manifested in clusters of similar documents, the latter address the fact that a document can be relevant even if only a very small part of it contains query-pertaining information. Hence, cluster-based approaches could be viewed as based on “expanding” the document representation, while passage-based approaches can be thought of as utilizing a “contracted” document representation. We present a study of the relative benefits of using each of these two approaches, and of the potential merits of their integration. To that end, we devise two methods that integrate whole-document-based, cluster-based and passage-based information. The methods are applied for the re-ranking task, that is, re-ordering documents in an initially retrieved list so as to improve precision at the very top ranks. Extensive empirical evaluation attests to the potential merits of integrating these information types. Specifically, the resultant performance substantially transcends that of the initial ranking; and, is often better than that of a state-of-the-art pseudo-feedback-based query expansion approach.     

Integrating actual time usage into the assessment of examination time extensions provided to disabled college engineering students

Abstract

In this study, we suggest combining the monitoring of actual examination time used with grades in order to assess examination time extensions in terms of access provision and expected outcome. Using naturally-occurring data collected from a large sample (N?=?2315) of undergraduate engineering students, we argue that extended examination time may be regarded as providing equal access when a disabled student actually utilizes more examination time than a normally achieving student, regardless of the grade obtained. We further argue that extended examination time may be regarded as resulting in the expected outcome when a disabled student either (a) utilizes less or equal examination time and achieve grades that are lower than a normally achieving student, or (b) utilizes more examination time and achieve grades that are equal to a normally achieving student. In our data, equal access was provided in all courses (i.e. disabled students utilized more time than normal achievers), but the expected outcome (i.e. equal grades) was not observed in software and English examinations. The results of this study emphasize the importance of monitoring actual time usage in addition to performance measures when assessing examination time extensions.     

Online versus traditional teaching evaluation: mode can matter

Using an experimental mixed design, this study compared the traditional paper‐and‐pencil method for evaluating teaching with the online method. Replicating previous findings, the comparison revealed similar evaluation means of the two methods. However, the stability of teaching evaluations using paper‐and‐pencil twice was substantially higher than the corresponding stability using different methods—online and paper‐and‐pencil. One possible explanation for this finding is the different visual presentation of the scales: a typical form of the paper‐and‐pencil method presents the scale horizontally, enabling the subjects to examine the profile of their answers that might result in an artificially lower variability of the evaluations. In contrast, an electronic answering form can abolish this artificial answering effect.     

Definition and Measurement of Selection Bias: From Constant Ratio to Constant Difference

Despite its intuitive appeal and popularity, Thorndike's constant ratio (CR) model for unbiased selection is inherently inconsistent in n -free selection. Satisfaction of the condition for unbiased selection, when formulated in terms of success/acceptance probabilities, usually precludes satisfaction by the converse probabilities of rejection/failure, and vice versa. This paper suggests that this inconsistency is unavoidable due to the (negative) linear relation between "percent accepted" ( P ) and "percent rejected" (1 – P ), which does not preserve ratios and, thus, invalidates the conceptualization and measurement of selection bias in ratio terms. Therefore, we propose to substitute the CR model with a constant difference (CD) model for the definition and measurement of selection bias, and show the latter's underlying rationale and its applicability in both n -free and fixed- n selection.