Progress of the Merit Scholar: An Eight-Year Follow-up

Merit scholars from 1956 through 1959 were followed up in 1964 to obtain information about their academic and vocational achievement, current activities, hobbies and interests, future plans, and miscellaneous demographic information.     

Pigeons' preference for variable-interval water reinforcement under widely varied water budgets.

Water budget of pigeons was varied to assess the dependence of risk-sensitive preferences upon economic context such as has been reported for energy-budget manipulations with small animals in behavioral ecology research. Fixed- and variable-interval terminal-link water schedules reinforced choice between equal variable-interval initial-link schedules arranged on two pecking keys. While keeping a severely restrictive budget the same across three phases of the experiment, a contrasting distinct ample budget was arranged in each. To mimic typical methods in behavioral ecology studies, in each ample budget a more than three-fold increase in amount of water per reinforcer presentation was instituted simultaneously with significantly increased overall access to water. Total choice response rates plummeted in the ample budgets, and body weights either increased significantly or remained unchanged in different phases as expected by the nature of the different manipulations. Clear preferences for the variable-interval schedule were found throughout the experiment, except for rare instances of key bias. The results agree with similar operant food-reinforcement studies and extend conditions under which risk preference apparently does not depend upon economic context.     

Identifying Salient Beliefs About Leisure Activities: Frequency of Elicitation Versus Response Latency1

Sets of 16 beliefs about the consequences of each of 6 leisure activities were selected in a pilot study by means of free elicitation. The beliefs varied in salience (salient vs. nonsalient), valence (positive vs. negative), and type (instrumental vs. effective). In the main study, 69 college students expressed their agreements with each belief, evaluated the consequences involved in the beliefs, and rated each leisure activity on 4 evaluative scales as a standard measure of attitude. The latencies of these responses were used to assess accessibilities of beliefs and attitudes in an effort to quantify degree of salience. Accessibility of beliefs was found to increase significantly with frequency of elicitation in the pilot study (salience) and with the judged favorability of the consequences. Salience was further found to be related to degree and extremity of agreement. Accessibility was also found to moderate the correlation between beliefs and attitudes posited in the expectancy-value model of attitude. The correlation between a given belief and the direct attitude measure increased with the belief's accessibility, and the correlation between a measure of attitude based on the set of salient beliefs and the standard attitude measures increased with the accessibility of the attitude. Implications for the identification and measurement of perceived benefits and costs of leisure are discussed.     

Developmental perspectives and family therapy: The marital life cycle

Developmental perspectives have been part of family therapy for more than two decades with a primary focus on the family life cycle and individual development. Most efforts at recognizing a marital life cycle have subsumed marital tasks under rubrics based primarily on parental roles. This paper offers a marital life cycle based on marital development with specific tasks for each of four stages-the marital breakup and remarriage phases are not included here-and provides implications for therapy.     

An approach to integrating “professional responsibility” in engineering into the capstone design experience

ABET 2000 Criteria encourages development of proficiency in professional responsibility in engineering as part of the undergraduate curriculum. This paper discusses the use of industrially sponsored capstone design projects to encourage active discussion of professional responsibility in engineering that naturally occurs during the engineering design process. The paper also discusses student participation in designing responses and approaches to issues such as engineering ethics. The paper includes specific examples of topics addressed by students and the approaches developed (by students) in addressing these issues. An earlier version of this paper was presented at the International Conference on Ethics in Engineering and Computer Science, Case Western Reserve University, Cleveland, March 21–24, 1999.     

Evolution: Journey or Random Walk?

Though early ideas of evolution saw it as progressive, most modern theories see it as a random walk. The theories of Richard Dawkins, Stephen Jay Gould, Edward O. Wilson, Stuart Kauffman, Steven Rose, and Robert Wesson are surveyed, showing their agreement on the fact of evolution but not on the mechanism. Evolution is an incomplete theory. Any theology should therefore be based only on its broadest features. Generally, evolution is the development of complex forms from simple ancestors. Within a Christian context, it can be seen as a journey toward the unification of all things in Christ, the ultimate complexity.     

Do development and learning really decrease memory? On similarity and category-based induction in adults and children

In a recently published study, Sloutsky and Fisher [Sloutsky, V. M., & Fisher, A.V. (2004a). When development and learning decrease memory: Evidence against category-based induction in children. Psychological Science, 15, 553-558; Sloutsky, V. M., & Fisher, A. V. (2004b). Induction and categorization in young children: A similarity-based model. Journal of Experimental Psychology: General, 133, 166-188.] demonstrated that children have better memory for the items that they generalise to than do adults. On the basis of this finding, they claim that children and adults use different mechanisms for inductive generalisations; whereas adults focus on shared category membership, children project properties on the basis of perceptual similarity. Sloutsky & Fisher attribute children's enhanced recognition memory to the more detailed processing required by this similarity-based mechanism. In Experiment 1 we show that children look at the stimulus items for longer than adults. In Experiment 2 we demonstrate that although when given just 250ms to inspect the items children remain capable of making accurate inferences, their subsequent memory for those items decreases significantly. These findings suggest that there are no necessary conclusions to be drawn from Sloutsky & Fisher's results about developmental differences in generalisation strategy.     

Deciding between theories of how reasoning develops is hard

Although Sloutsky agrees with our interpretation of our data, he argues that the totality of the evidence supports his claim that children make inductive generalisations on the basis of similarity. Here we take issue with his characterisation of the alternative hypotheses in his informal analysis of the data, and suggest that a thorough Bayesian analysis, although practically very difficult, is likely to result in a more finely balanced outcome than he suggests.