Learning to search: From weak methods to domain-specific heuristics

Learning from experience involves three distinct components—generating behavior, assigning credit, and modifying behavior. We discuss these components in the context of learning search heuristics, along with the types of learning that can occur. We then focus on SAGE, a system that improves its search strategies with practice. The program is implemented as a production system, and learns by creating and strengthening rules for proposing moves. SAGE incorporates five different heuristics for assigning credit and blame, and employs a discrimination process to direct its search through the space of rules. The system has shown its generality by learning heuristics for directing search in six different task domains. In addition to improving its search behavior on practice problems, SAGE is able to transfer its expertise to scaled-up versions of a task, and in one case, transfers its acquired search strategy to problems with different initial and goal states.     

Ethical leadership,person-organizational fit,and productive energy: a South African sectoral comparative study

ABSTRACT

Research suggests that ethical leadership (EL) affects employee behavior and organizational functioning. This study aimed to determine the relationship between EL and productive energy (PE), as mediated by person-organizational fit (POF). The study used assumptions of the social learning and social exchange theories that posit that leadership has a direct impact on employee behavior, mainly through role modeling and the reciprocal nature thereof. An empirical paradigm using a cross sectional quantitative design was used. The PE instrument (developed in the USA) was assessed for construct validity within the South African context (exploratory and confirmatory factor analysis). The analysis included a comparison between the private and public sectors, emphasizing the importance of context as differentiator. Relatively high, statistically significant correlations were found between the variables for both sectors and the combined sample. The hierarchical regression analysis indicated that 18% of the variance in PE is explained by EL. This model was improved by the inclusion of POF (total variance of 32% explained). The conceptual model was confirmed with structural equation modeling (SEM). The findings of this study suggest that EL has a significantly positive effect on PE and POF, which mediates the relationship between EL and PE. Sectoral differences were reported.     

Identification and conceptualization of procedural chunks in chess

When it comes to cognitive architecture and human information processing, chunks are one of the best known and most recognized constructs. Nevertheless, the nature of chunks is still very elusive, especially when it comes to chunks in procedural knowledge. This study deals with basic features of procedural information processing and examines the manifestation of chunks in procedural knowledge. The participants' task was to reconstruct sequences of chess moves. Chess was chosen as an experimental domain, because of its complexity, well-defined rules and standardized measure of chess player strength. From the results we conclude that short-term memory capacity is determined by the combination of the size and amount of procedural chunks recalled to the short-term memory. We have shown that on average, participants with more specialized knowledge operated faster and with larger chunks of procedural information than participants with less specialized knowledge. We have shown that in procedural information processing, the level of expertise and the sorting order of the retrieved information are important factors that influence the amount of procedural chunks retained in the short-term memory. Therefore, the capacity of short-term memory in complex situations cannot be expressed as a simple concept.     

The international financial crisis and the north‐south dialogue

The author describes several origins of current international financial problems. Shortcomings of current solutions are analyzed, and solutions which the author thinks are more appropriate are presented.     

The Influence of Unrestricted Information Exchange on Willingness to Share Information With Outsiders

This study addressed how engaging in different forms of information exchange within a group is related to group members' willingness to share risk information with outsiders. Drawing from social exchange theories, we focused on 3 unrestricted forms of information exchange: pure‐generalized, group‐generalized, and productive. We hypothesized that individuals' intentions to share information with outsiders would be associated positively with engagement in pure or group‐generalized exchanges and negatively with productive exchange. The hypotheses were supported with data from a national survey of U.S. growers (N = 452) that examined their information‐sharing behaviors with other parties inside and outside their local region. The findings have broad implications for understanding information sharing within and across groups.     

The relationship between information processing style and information seeking,and its moderation by affect and perceived usefulness: Analysis vs. procrastination

We examined the relationship between information processing style and information seeking, and its moderation by anxiety and information utility. Information about Salmonella, a potentially commonplace disease, was presented to 2960 adults. Two types of information processing were examined: preferences for analytical or heuristic processing, and preferences for immediate or delayed processing. Information seeking was captured by measuring the number of additional pieces of information sought by participants. Preferences for analytical information processing were associated positively and directly with information seeking. Heuristic information processing was associated negatively and directly with information seeking. The positive relationship between preferences for delayed decision making and information seeking was moderated by anxiety and by information utility. Anxiety reduced the tendency to seek additional information. Information utility increased the likelihood of information seeking. The findings indicate that low levels of anxiety could prompt information seeking. However, information seeking occurred even when information was perceived as useful and sufficient, suggesting that it can be a form of procrastination rather than a useful contribution to effective decision making.     

Factors affecting perceived safety and enjoyment based on driver experience

A positive driving experience, especially for older drivers, increases the attention to the emotional dimensions of driving, such as the driver’s perceived safety. Therefore, this study empirically presents factors affecting driver experience and compares them between older and younger drivers. Consequently, we conducted a face-to-face survey on elderly and young drivers and analyzed the data of 246 drivers using structural equation modeling. The analysis presented measurements and structural model evaluations. Considering the analysis, it was found that driving-related information and car-exterior context affect the perceived safety and enjoyment of a driver’s experience. Additionally, car-exterior context exerts a greater influence on the perceived safety and enjoyment of the elderly drivers’ group than the young drivers’ group. The results of this study will empirically contribute to the satisfaction of driver experience and perceived safety improvement in the future. It also provides a basis for the development of driving interfaces to improve the quality of the driving experience of the elderly.     

Affective commitment,trust, and the psychological contract: contributions matter,too!

ABSTRACT

Employees’ receipt of inducements is associated with trust and affective commitment, and employees pay for their inducements with their contributions (e.g., time, and physical and intellectual effort). Yet this relationship does not fully mirror events as they occur in an employment relationship where employees’ promises and delivery of inducements and contributions are ongoing, and relatively continuous. Our premise is that promising and delivering contributions may enhance or reduce employees’ trust in and commitment to the organization depending on how well they fulfill psychological needs. We tested a social exchange theory model and our alternative model. Survey results favoured our alternative model and suggested that employees’ contributions were related to trust and commitment, independent of the role of inducements. Tests of the social exchange model exhibited worse fit to the data. Breach and fulfilment results from polynomial regression and response surface analyses revealed that commitment was higher when delivered contributions equal promised contributions and declined when delivered amounts were deficient of, or exceeded, promised amounts. Employees’ promised and delivered contributions to organizations may constitute a path to their feelings of commitment, but commitment was highest when delivered contributions were within close range of promised amounts.