AD/HD Symptoms and Conduct Problems: Similarities and Differences in Maternal Perceptions

Several theories attempt to explain the high co-occurrence of Attention Deficit/ Hyperactivity Disorder (AD/HD) and Conduct Problems (CP). A strong possibility is that AD/HD behaviours lead to the development of CP, due to family coercive interaction patterns, maintained through parental false beliefs regarding child problem behaviour. We compared maternal perceptions about AD/HD behaviors and CP, and the possible reactions elicited by such behaviours. The sample consisted of 317 mothers of boys and girls aged 4–6. Four versions of The Parental Account of the Causes of Childhood Problems Questionnaire were used, in which a vignette was ascribed to either a boy or a girl displaying some of the major AD/HD behaviours or CP. The results showed that CP were perceived as significantly more severe than AD/HD behaviours. Moreover, AD/HD behaviours were attributed to biological causes more often than CP, and less strict rearing practices were chosen for AD/HD symptoms. Our findings provide evidence that mothers usually perceive AD/HD behaviours and CP as separate entities and may behave accordingly with their children.     

THE EFFECTS OF RECIPROCAL PEER TUTORING AND GROUP CONTINGENCIES ON THE ACADEMIC PERFORMANCE OF ELEMENTARY SCHOOL CHILDREN

We evaluated the effects of reciprocal peer tutoring combined with group reinforcement contingencies on the arithmetic performance of 12 underachieving fifth-grade students. Results indicated that the intervention increased the students' arithmetic performance to a level indistinguishable from their classmates during treatment and 12-week follow-up phases. Pre-, post-, and follow-up sociometric data indicated that the students who participated in the treatment groups increased their amount of peer affiliation with other treatment group members.     

Was heißt es,eine empirisch-wissenschaftliche Theorie zu konstruieren?

Journal for General Philosophy of Science - While the logical reconstruction of empirical theories is, in principle, no longer a matter of dispute, the possibility and, furthermore, the procedure...     

Effects of required rates of responding upon choice

Pigeons' responses in the presence of two concurrently available (initial-link) stimuli produced one of two different (terminal-link) stimuli according to identical but independent variable-interval schedules. Responses in the presence of each terminal-link stimulus produced equal frequencies of food reinforcement, but in the presence of one of the stimuli, food depended upon the emission of a response rate either higher or lower than a specified value (differential reinforcement of rates). The measure of preference, the dependent variable, was the distribution of responses in the presence of the concurrently available stimuli of the initial links. Each pigeon, the responding of which was appropriately controlled by the response-rate requirements in the two terminal-link stimuli, consistently preferred the stimulus not associated with a response-rate requirement.     

Matrix operations and the properties of networks and directed graphs

Matrix multiplication is frequently used to derive properties and quantitative features of directed graphs and networks from their adjacency or value matrices. In many cases, a “modified” matrix multiplication is employed, where other binary operations replace ordinary addition and multiplication. In this paper, a set of conditions for permissible value domains, “addition” and “multiplication” operations, and value matrices is developed under which generalized matrix multiplication directly yields properties of a digraph or network. An additional condition ensures that the properties are related to paths of the structure rather than sequences in general. Finally, a number of applications of generalized matrix multiplication are discussed.     

Self-punitive behavior in humans: Effects of a self-fulfilling prophecy

Human subjects were exposed to contingencies which programmed aversive tones (100 db). Two types of contingencies were employed: self-confirming (i.e., self-fulfilling prophecies), in which the aversive tone was occasioned by the prediction it was about to occur; and self-disconfirming, in which the tone was probable when subjects predicted it would not occur. Experiments 1 and 2 used a modified classical conditioning paradigm, and demonstrated that a self-confirming contingency maintained reliable self-punitive responding, i.e., subjects consistently predicted and therefore obtained tones on every trial. Subjects in Experiment 3 were instructed to express predictions continuously throughout four sessions to ensure adequate sampling of the various predictions. Subjects exposed to a self-disconfirming contnngency reliably evidenced awareness of the contingency in effect (judged by answers on a postexperimental questionnaire), whereas subjects exposed to a self-confirming contingency failed to show effective avoidance behavior or contingency awareness. Experiment 4 investigated free-operant self-punitive behavior, utilizing a single prediction response button, which subjects depressed repeatedly. Subjects were exposed to either periodic or aperiodic punishment schedules over as many as four sessions. In general, more persistent self-punitive responding was found in the groups receiving periodic punishment. The results from the four experiments show that self-confirming contingencies can effectively prolong self-punitive responding in human subjects. The findings are consistent with a blocking interpretation of self-punitive behavior, which asserts that when an aversive event is already predicted by stimuli in the situation (including temporal cues), the association between a response and punishment is impaired, and self-punitive responding is likely to be maintained. An integration of human and animal self-punitive research is proposed.     

Philosophy of medicine as the source for medical ethics

The article offers an approach to inquiry about, the foundation of medical ethics by addressing three areas of conceptual presupposition basic to medical ethical theory. First, medical ethics must presuppose a view about the nature of medicine. it is argued that the view required by a cogent medical morality entails that medicine be seen both as a healing relationship and as a practical art. Three ways in which medicine inherently involves values and valuation are presented as important, i.e., in being aimed at the good of health, in being a cognitive art evaluating towards that good, and as a manifestation of a virtuous disposition concerning that good. Finally, a value ontology drawn from these considerations is seen as necessarily underlying medical ethics. A set of three such basic values are promoted as crucial: the value of health; the value of the individual patient; and the value of altruism that mediates the class of potential patients.