Periodicities within a fixed-interval session

Within-session periodicities in number of responses per interval and postreinforcement pauses were investigated on fixed-interval schedules of 1, 2, and 3 minutes with rats. Postreinforcement pause values and the number of responses in successive intervals were not systematically related. The direction of change of these variables from one pair of intervals to the next revealed periodicities in that the direction of change varied more than would be expected by chance. A response prevention technique used to manipulate the length of time spent responding in an interval had little effect on the postreinforcement pause value of the next interval except when only a single response was permitted in an interval. This procedure tended to reduce the postreinforcement pause value of the next interval to an abnormally low level.     

Maximum information per time unit designs for continuous online item calibration

Previous designs for online calibration have only considered examinees’ responses to items. However, the use of response time, a useful metric that can easily be collected by a computer, has not yet been embedded in calibration designs. In this article we utilize response time to optimize the assignment of new items online, and accordingly propose two new adaptive designs. These are the D-optimal per expectation time unit design (D-ET) and the D-optimal per time unit design (D-T). The former method uses the conditional maximum likelihood estimation (CMLE) method to estimate the expected response times, while the latter employs the nonparametric k-nearest-neighbour method to predict the response times. Simulations were conducted to compare the two new designs with the D-optimal online calibration design (D design) in the context of continuous online calibration. In addition, a preliminary study was carried out to evaluate the performance of CMLE prior to its application in D-ET. The results showed that, compared to the D design, the D-ET and D-T designs saved response time and accrued larger calibration information per time unit, without sacrificing item calibration precision.     

A Reader’s Guide to al-Shāfiʿī’s Epistle on Legal Theory (al-Risāla)

Al-Shāfi?ī’s famous Epistle on Legal Theory (al-Risāla) has long been hailed as formative for the discipline of Islamic legal theory (u?ūl al-fiqh), but its structure and the wording of some of its most important passages remain a puzzle. This essay is intended as an aide for the study of the Risāla’s Arabic text. It surveys scholarly disagreements about the work’s significance and structure, and argues that it is best understood as a sequence of three distinct compositions, the second and third having been appended to address issues raised by opponents during discussions about the first. Each ‘book’ makes a separate argument, has its own internal structure, and is distinguished by terminological and stylistic features. Most of the article consists of a detailed analytical outline that spells out what point al-Shāfi?ī is trying to make with each of his concrete legal examples, and shows how they fit together into a sequence of three related but separately organized arguments.     

Understanding injuries in sports: Self-reported injury and perceived risk of injury among adolescents

IntroductionAlthough exposure and perceived risk of injury in sports among adolescents is a well-known phenomenon today, their understanding remains poorly explored.ObjectiveThis study examines the relationships between demographics, sport motives, and sport-related characteristics in a sample of French adolescents involved in sports.MethodsThe sample included 394 adolescents involved in sports, between 13 and 19 years old. The adolescents filled out a questionnaire requesting information about their age, sex, sport motives, sport-related characteristics, the number of injuries, and perceived risk of injury in their preferred sport.ResultsThe findings showed that the number of injuries was related to age, sex, type of sport and the participant's motives. The will to play to the limit increased with the exposure to injury. Participation in risky sports and the will to play to the limit were predictors of the adolescents’ risk of exposure to sports injuries. Time devoted to sports appears to be a confounding factor. Moreover, boys exhibited higher number of injuries than girls, and they perceived their preferred sport as riskier.ConclusionExposure to the risk of injury in sports and the exacerbated perception of that risk may provide a means of enhancing one's self-image, procuring an emotional experience, and constructing one's masculinity.     

Organizational silence,organizational commitment and creativity: The case of directors of Islamic Azad University of Khorasan Razavi

IntroductionToday, one issue that arose in human resource discussions is the phenomenon of organizational silence (OS).ObjectiveSince it has not been carried extensive research out on this phenomenon in Iran, the purpose of this study was to investigate the relationship between OS and Organizational Commitment (OC) and Organizational Creativity (OCR) among managers of the Islamic Azad University of Khorasan Razavi.MethodsWe based the theoretical framework of this study on the OS scale of Morrison and Milliken (2003) and the Allen and Myers’ (1990) Three-Component OC Scale and OCR questionnaire of Randsip (1979). The questionnaire's internal reliability by Cronbach's alpha for OS, OC, and OCR was 0.81, 0.89, and 0.84 respectively. Also, 200 executives, deputies, managerial and administrative directors were tested. The Pearson correlation coefficient and structural equations were used to analyze the data.ResultsThe findings illustrate that in this organization, there is a significant and an inverse relationship between OS and OC and OCR. So, the more is the OS, the greater is the lack of OCR and OC.ConclusionThe results show that OCR is moderate and downward. OCR can be because of different factors, but is more affected by the dimensions of OC. OCR and continuous commitment could explain 0.84 of the variance of dependent variables. Also, all the research hypotheses were approved and 0.89 of the total variance of the dependent variable was illustrated in terms of effective factors.     

La croyance au monde juste comme facteur explicatif de diverses réactions à des injustices professionnelles

The belief in a just world is defined as the tendency to consider that “people get what they deserve and deserve what they get”, i.e. to consider that the world is, globally, a place of justice. Facing an individual unjustly victim of negative events and for whom it seems impossible to restore the justice objectively, we frequently deny the existence of the unjustice, even if we say the responsible of what he gets. But if we can react by adopting “passive” reactions (using the victim’s moral or behavioral responsibility, as in Lerner, or evocating a future favoring the victim,..), we can also adopt “active” strategies which can lead to an objective re-establishment of the justice. In the present study, we examined the influence of the degree of the belief in the just world on the selected strategy facing professional injustices. And effectively, our results indicate a some preferences in the use of such or strategy, preferences accentuated by the gender and the professional statute.     

Interlocking schedules: the relationship between response and time requirements.

Rats were exposed to an interlocking fixed-ratio 150 fixed-interval 5-minute schedule of food reinforcement and then to yoked variable-ratio schedules in which individual ratios corresponded exactly to the ratios of responses to reinforcement obtained on the interlocking schedule. After additional training with the interlocking schedule, the rats were exposed to yoked variable-interval schedules in which intervals corresponded to the intervals between successive reinforcements obtained on the second interlocking schedule. Response rates were highest in the yoked VR condition and lowest in the yoked VI, while intermediate rates characterized the interlocking schedule. Break-run patterns of responding were generated by the interlocking schedule for all subjects, while both the yoked VR and VI schedules produced comparatively stable local rates of responding. These results indicate that responding is sensitive to the interlocking schedule's inverse relationship between reinforcement frequency and responses per reinforcement.     

Justice and employee attitudes during organizational change: The mediating role of overall justice

IntroductionSeveral studies have investigated the mediating role of overall justice (OJ) in the relationships between specific dimensions of justice and employee attitudes. However, prior research has neglected to examine OJ during the process of organizational change, as suggested in fairness heuristic theory (FHT).ObjectiveThis study aims to replicate the results of previous studies and expand them by examining, in two contexts of organizational change implementation, the mediating role of OJ in the relationships between procedural, interpersonal, and informational justice (PJ, ITJ, and IFJ, respectively) and employee attitudes (job satisfaction, turnover intentions, and organizational commitment).MethodologyWe surveyed 537 employees experiencing a company reorganization (Study 1) and 188 employees experiencing a merger (Study 2).ResultsEach dimension of justice is related to OJ, which in turn is associated to employee attitudes. Furthermore, bootstrap results indicated that OJ mediates the effects of PJ, ITJ, and IFJ on job satisfaction and turnover intentions (in both studies), and on affective, normative, and continuance commitment (in Study 2).ConclusionOur findings show the importance of fairness during organizational change. Treating employees fairly in times of change is crucial for managers.