Titration of schedule parameters by pigeons

Pigeons were tested in a computer-controlled two-key chamber. A standard (nonchanging) schedule of reinforcement was in force on one key, and an adjusting schedule on the other. The schedules were available concurrently after each reinforcement, but after the first peck on either key (the choice peck), the schedule on the other key was made inoperative. The parameter of the adjusting schedule was decreased when the standard schedule was chosen and increased when the adjusting schedule was chosen. The standard schedule was changed only between sessions. Fixed intervals and fixed ratios were used as standard schedules, and intervals and ratios were used as adjusting schedules. When standard and adjusting schedules were of the same type, median parameters on the adjusting key equalled those of the standard schedules, at four values of each standard schedule. For four of five birds, and for the group median, similar curves could be plotted through the indifference points obtained from a standard ratio with an adjusting interval, and from a standard interval with an adjusting ratio. These points showed consistent individual differences, but they could be predicted by assuming that the median time from the choice peck to reinforcement should be the same on both keys. This is equivalent to treating the schedule as a concurrent chain and assuming that Herrnstein's quantitative law of effect applies.     

Discrimination of polymorphous stimulus sets by pigeons

Pigeons were trained to perform a visual discrimination between stimulus sets in which the presence of any two of three positive features made a stimulus positive, while any two of three negative features made it negative (there were thus three different positive and three different negative stimuli). After training, the birds were exposed to test stimuli that contained either all three positive or all three negative features. In Experiment I three pigeons were successfully trained by a successive method, and subsequently responded to the test stimuli as though they were positive or negative respectively. In Experiment II four pigeons were trained by a simultaneous method. Three learned the discrimination and generalized appropriately to the test stimuli, but they showed no preference between positive test and positive training stimuli, nor any consistent difference in speed of response to them; and similar results were found for negative stimuli. It is argued from this that the pigeons learned to respond to the stimuli as patterns (configurations of features) rather than to the constituent features, but that they generalized to the test stimuli by using the common features. The experiments show that pigeons could in principle learn to discriminate natural polymorphous classes (such as “pigeon” or “person”) without using any single feature, but neither the present experiments nor earlier ones demonstrating discriminations of such natural classes establish that pigeons make use of polymorphous concepts in the same way as people.     

Developing Effective Prevention Services for the Real World: A Prevention Service Development Model

A Prevention Service Development Model (PSDM) is presented as an approach to develop prevention programs that are both effective and that are readily adopted for implementation in community settings. The model is an integration of concepts and methods from two fields, prevention research and marketing research as applied to new service development. Questions that are posed at each stage of the PSDM are described. Studies from the development of two preventive interventions are presented to illustrate research at several of the stages of the model.     

What's Fair When a Child Testifies?1

Undergraduates (N = 385) watched a 2-hr, videotaped, mock trial of a child sexual abuse case. The child testified in open court, with a barrier between the child and the defendant, or via closed circuit television. Students enacted the role of a juror, sibling of the defendant, or sibling of the mother of the victim. The judge either did or did not warn jurors that the barrier or video should not be considered evidence of the defendant's guilt. Use of the barrier or video did not influence guilty votes, the credibility of witnesses, nor the perceived fairness of the trial for jurors. Siblings of the defendant perceived these procedures to be biased and their use as unfair. Increased publicity about the use of barriers and closed-circuit television when children testify is recommended to reduce objections to these procedures.     

Job skill discretion and emotion control strategies as antecedents of recovery from work

Recovery from work protects employees’ health and well-being, and therefore it is important to understand its antecedents. The aim of this study conducted among 183 middle-aged participants drawn from the Finnish Jyväskylä Longitudinal Study of Personality and Social Development was to examine whether job skill discretion and emotion control strategies (emotional rumination and emotional inhibition) are related to psychological aspects of recovery from work (subjective recovery evaluation, psychological detachment and relaxation). The results of hierarchical general linear models confirmed the hypothesis that job skill discretion is positively associated with subjective recovery evaluation and relaxation. As expected, high emotional rumination predicted difficulties in psychological detachment and relaxation. Emotional inhibition moderated the relationship between job skill discretion and psychological detachment: where emotional inhibition was at a moderate level, job skill discretion was positively related to psychological detachment. The findings suggest that not only job characteristics but also individual factors contribute to recovery, revealing practical implications for employees, employers and occupational health care professionals seeking to promote employees’ work ability, health and well-being.     

Evaluation of a counselling skills course for health professionals

A counselling skills course run by a London hospital for 11 health professionals was evaluated. The course covered family counselling skills and child management techniques. Qualitative and quantitative measures were used at five times of testing over a period of 10 months. It was found that participants improved self-perceptions of their counselling ability, increased their knowledge of counselling theories, and considered the course to be helpful in their subsequent work with families. There was no significant change in trainees' self-concept scores. Regular supervision was regarded as helpful in consolidating skills and exploring aspects of practice in a safe environment. Issues relating to evaluation research are discussed.     

Unemployment and Psychological Distress: Mediator Effects

The study concerned possible mediators and moderators in the relationship between unemployment and psychological distress. The sample consisted of 58 unemployed and 177 employed 36-year-old Finnish people drawn from the ongoing Jyväskylä Longitudinal Study of Personality and Social Development. Data were gathered by means of a mailed questionnaire, a semistructured interview, and personality inventories. The results showed that poor economic situation, and poor self-esteem as measured by Rosenberg's Self-Esteem Scale, mediated the relationship between unemployment and psychological distress even after controlling for the prior level of self-esteem. Psychological distress was defined as psychological ill-health (the General Health Questionnaire), depressive symptoms (the General Behavior Inventory), and anxiety (the Karolinska Scales of Personality). However, support was also found for an alternative model, in which depressive symptoms functioned as a mediator between long unemployment and poor self-esteem, suggesting that individuals may react to unemployment in different ways.     

A Big Five personality inventory in two non-Indo-European languages

In this study we report on two successful replications of a five-factor personality inventory in two non-Indo-European languages, Estonian and Finnish, which both belong to the group of Uralic languages. Costa and McCrae's (1985) NEO Personality Inventory was adapted to these two languages. By all relevant psychometric parameters neither developed construct differs from the original construct: the reliabilities of only 11 per cent for the Estonian and 36 per cent for the Finnish subscale were lower than those of the respective NEO-PI scales. The factor structure of both Estonian and Finnish inventories was very close to the five-factor structure of the NEO-PI, accounting for 71.7 per cent and 67.0 per cent of the variance, respectively. In spite of this generally good agreement, some language- or culture-dependent differences were observed. Both Estonian and Finnish women were more extroverted and conscientious than men, compared with their English-speaking counterparts. Also, some differences exist in the need for other people's company and excitement seeking. In the Balto-Fennic culture gregariousness appears to presuppose some emotional stability and openness and excitement seeking is conceptualized more as a tool of rescuing from anxiety, depression, and low self-esteem. This study is considered as a step towards determination of which parts of the most popular instrument for the measurement of the Big Five personality dimensions are truly universal and which parts of it are specific to a particular language and culture.     

A SCALING METHOD FOR MEASURING COLOR CONSTANCY

Recently developed types of indirect psychophysical scaling method served as starting point in finding a handy procedure for measuring differences in the degrees of 'color constancy'. A design for carrying out categorical comparisons with color paper proofs was constructed. The raw scores, given as percentage distributions, prove transformable into standard scale values. These demonstrate the shifted positions of the colors in question when presented in alternating conditions of illumination.