Evolution and human choices

The postmodern world seems to have conclusively lost faith in the heady promises of human emancipation through rational understanding that have pervaded the Western world since the time of the Enlightenment. As the end of the millennium approaches and the evidence of man‐made environmental degradation accumulates nihilism and malaise color the future. This article argues that a clear understanding of both evolutionary forces and human consciousness permits to formulate a guardedly optimistic alternative view. It is advanced that the very sense of despair current circumstances have created may trigger a move toward a new form of psycho‐functional adaptation, simultaneously constituting a first instance of “conscious evolution” and fulfilling the progressive promise intrinsic in the full use of our rational faculties.     

Development of views of life scale

Abstract

The Views of Life Scale (VOLS) was designed to measure perception of well-being in three areas: inherent value of life, effective life management, and sense of health. Items were placed in these three categories by a team of advanced doctoral students; their overall agreement on item placement was 91.8%. These three categories became Subscales I, II and III of the total instrument. Seven hundred and thirty-two participants responded to the 42 item VOLS; subsamples of this group also took various other instruments with which the VOLS was being compared. Reliability assessment yielded very strong test-retest stability (I=0.80, II=0.87, III=0.76, Total=0.86) and high internal consistency (I=0.76, II=0.83, III=0.81, Total=0.91) for the VOLS measures. Relationships between the VOLS and other inventories provided consistent support for the convergent and divergent validity of the VOLS. An oblique rotation factor analysis produced five major quantitative clusters in the VOLS. There was considerable overlap between these factors and the original subscales.     

Juggling roles and expectations: dilemmas faced by women talking to relatives about cancer and genetic testing

Health professionals do not inform their patients’ kin about BRCA1/2 test results or genetic testing without their written consent. Thus, the onus is on women attending genetic counselling to talk to relatives about the family history and their potential increased risk. This communication process within the family is largely unexplored and provides the focus of the present study. Fifteen healthy women attending a genetics clinic for predictive testing were interviewed prior to receiving their test result and again 6 months later. A grounded theory approach was used. Findings illustrate the dilemmas women faced in juggling social roles and expectations, which had an impact on communication within the family in the context of predictive genetic testing. Tensions between responsibilities towards themselves and others and their fulfilment of social roles had an impact on who women informed and on how they did so. These factors should be considered when assigning patients the role of information provider.     

General analytical solution for stress intensity factor of a hypocycloid hole with many cusps in an infinite plate

In this article, the problem for the determination of the displacement functions and the stress intensity factors (SIFs) around a boundary of a hypocycloid hole with cusps in an infinite elastic plate subject to normal and shear stresses are presented. A hole with cusps (hypocycloid) is mapped onto a unit circle and the modified complex potential is used for solving the relevant boundary value problems. An analytical solution for the SIF of a hypocycloid hole is obtained. For a special case, our results agree with others.     

Applied Research and Zoo Education: The Evolution and Evaluation of a Public Talks Program using Unobtrusive Video Recording of Visitor Behavior

ABSTRACT

The provision of high-quality conservation education has become a priority for modern zoos. This can be delivered in a number of differing ways to account for differences in learning styles and prior knowledge of zoo visitors. At Chester Zoo (United Kingdom), a team of full-time and highly trained interpreters (known as presenters) deliver a diverse public talks program every day of the year. Although these talks attract a large audience, little was understood about their impact on the visitor. As a result, an extensive, unobtrusive study using video recording equipment was undertaken to assess visitor behavior. Results suggest that visitor attentiveness was much higher among those individuals who found themselves in a better viewing position (where they could see the animal and presenter). Visitors who were in poor-visibility positions showed less attention than visitors who were observed under control conditions, without an accompanying talk, indicating a high environmental component to learning potential. When interactive elements were included in a talk (such as an animal feed or enrichment activity) attentiveness was dramatically increased. More crucially, however, was that during talks where there was no interactivity or animals were inactive, attentiveness fell to below control levels, suggesting that heightened visitor expectations created by the anticipation for the talk were not being met—a serious barrier to learning. These findings offer a series of measures that can be taken to improve the educational impact of a zoo talks program whilst, at the same time, providing a better quality experience for zoo visitors.     

The Relation of Parent and Child Gender to Parental Tolerance of Child Disruptive Behaviors

Parental tolerance has been defined as the degree to which a parent tends to be annoyed by his or her child’s disruptive behavior. The purpose of the current study is to examine the relation of both parent and child gender to parental tolerance of child disruptive behaviors. Participants were 150 parents with 3–6 year-old at-risk children (47.5 % girls) who sought help with parenting of their child’s oppositional defiant behaviors. Tolerance was measured by the difference between parent ratings of intensity on 36 disruptive behaviors and whether each behavior was identified as a problem (resulting in a score of either high, expected, or low tolerance). A 2 (child gender) by 2 (parent gender) analysis of variance was conducted on the tolerance score. A significant interaction between child and parent gender emerged: Mothers were equally tolerant of boys’ and girls’ oppositional defiant behavior but fathers were more tolerant of boys’ than girls’ oppositional behavior. Exploratory analyses suggested that this interaction may be qualified by clinical status of the child. Implications and future directions are discussed.     

The Role of Contextual Threat in Predicting Self-Reported Distress among Siblings of Children with Cancer

Each year, 14,000 children are diagnosed with cancer in the United States. Prolonged, intensive treatment regimens disrupt the entire family system, but effects on siblings are poorly understood. In this preliminary investigation, we employed a risk and resistance framework to study adjustment among 30 siblings (aged 10–17) of children undergoing cancer treatment. We examined whether or not objective stress associated with the cancer experience (contextual threat) predicted sibling distress and explored demographic and disease-related predictors of sibling adjustment. Contextual threat was positively associated with sibling-reported distress, independent of sibling age, gender, birth order relative to the child with cancer, and cancer treatment intensity. From among the demographic and disease-related factors, only younger birth order relative to the child with cancer was independently associated with sibling distress. These results suggest that a subset of siblings may be at increased risk for elevated distress in the face of their brother’s or sister’s illness.     

Exploring the determinants of dual goal facilitation in a rule discovery task

Wason's standard 2-4-6 task requires discovery of a single rule and leads to around 20% solutions, whereas the dual goal (DG) version requires discovery of two rules and elevates solutions to over 60%. We report an experiment that aimed to discriminate between competing accounts of DG facilitation by manipulating the degree of complementarity between the to-be-discovered rules. Results indicated that perfect rule complementarity is not essential for task success, thereby undermining a key tenet of the goal complementarity account of DG facilitation. The triple heterogeneity account received a good degree of support since more varied triple exploration was associated with facilitatory DG conditions, in line with this account's prediction that task success is associated with the creative search of the problem space. The contrast class account (an extension of Oaksford & Chater's, 1994, iterative counterfactual model) was also corroborated in that the generation of descending triples was demonstrated to be the dominant predictor of DG success. We focus our discussion on conceptual ideas relating to the way in which iterative counterfactual testing and contrast class identification may work together to provide a powerful basis for effective hypothesis testing.     

Dual-goal facilitation in Wason's 2–4–6 task: What mediates successful rule discovery?

The standard 2–4–6 task requires discovery of a single rule and produces success rates of about 20%, whereas the dual-goal (DG) version requests discovery of two complementary rules and elevates success to over 60%. The experiment examined two explanations of DG superiority: Evans' (1989) positivity-bias account, and Wharton, Cheng, and Wickens' (1993) goal-complementarity theory. Two DG conditions were employed that varied the linguistic labelling of rules (either positively labelled Dax vs. Med, or mixed-valence “fits” vs. “does not fit”). Solution-success results supported the goal-complementarity theory since facilitation arose in both DG conditions relative to single-goal tasks, irrespective of the linguistic labelling of hypotheses. DG instructions also altered quantitative and qualitative aspects of hypothesis-testing behaviour, and analyses revealed the novel result that the production of at least a single descending triple mediates between DG instructions and task success. We propose that the identification of an appropriate contrast class that delimits the scope of complementary rules may be facilitated through the generation of a descending instance. Overall, our findings can best be accommodated by Oaksford and Chater's (1994) iterative counterfactual model of hypotheses testing, which can readily subsume key elements of the goal-complementarity theory.