Shared activities of grandparents and grandchildren.

Responses of 391 young adult grandchildren to a list of 29 activities gave empirical support to the usefulness of the list by indicating the extent to which each activity was characteristic of their relationship with their most-close grandparent. Analyses of variance indicated the influence of 7 independent variables on the rating of the activities. Information from the study could provide a context to assist in considering the meaning of specific activities as they appear in research directed toward other aspects of the grandparent/grandchild relationship. It could also be helpful in educational programs as part of the anticipatory socialization of grandparents.     

Trends in the measurement of social validity

Since its inception in the mid-1970s, social validity has provided applied behavior analysts with a critical measure of the social impact and importance of their interventions. Recent discussion, however, has questioned the use of this construct in regard to the frequency and types of social validty measures employed in research. Despite the ensuing discussion, virtually no quantitative information has been made available to frame various perspectives and opinions. The purpose of this report is to present a content analysis of social validity measures used over the previous 20 years. Social validity was assessed along three dimensions: (a) type of assessment, (b) focus of assessment, and (c) time of assessment. Articles published in the Journal of Applied Behavior Analysis (1968-1990) and Behavior Modification (1977-1990) were surveyed. The results of the content analysis indicate that current applications of social validation procedures are presented in 20% of the articles surveyed. The majority of articles used subjective evaluation of outcomes following intervention to assess social validity. In addition, the data indicated that normative comparison was a rarely used method of social validation and that its use has been decreasing over time.     

Heart rate—QT relationships during baroreceptor stimulation with diminished autonomic influence on the ventricles

The shortening of the QT interval of the electrocardiogram coincident with acceleration of heart rate and vice versa has been accepted for many years as evidence that the action potential duration and hence QT are necessarily dependant on heart rate. Exceptions to this rule have been attributed to the intervention of counteracting autonomic effects. In order to test this assumption, 26 conscious dogs divided into three groups were tested during baroreceptor stimulation by a bolus injection of phenylephrine. Seventeen dogs had been used in earlier studies in which they had undergone an experimental anterior myocardial infarction with apparent full recovery. A group of those dogs underwent beta-adrenergic blockade by intravenous atenolol 30 min prior to the baroreceptor activation. To test the intactness of the baroreceptor responses in the previously infarcted dogs, a third group of nine dogs that had had no prior myocardial infarction was included. All dogs were adapted to the laboratory environment and were not sedated during experiments. Simultaneous recordings of RR, QT interval, and phasic arterial pressure were made in all dogs before and during baroreceptor stimulation. In the normal group, and the previously infarcted group that received no atenolol, baroreceptor stimulation elicited a small (8/msec), but significant prolongation of the QT associated with a nearly 50% reduction in heart rate. The QT interval of the atenolol-treated dogs, although significantly more prolonged before stimulation, remained unchanged during the reflex. The data indicate that withdrawal of ventricular sympathetic tone may prolong the QT interval, thereby confirming the role of sympathetic innervation in the control of QT. This inference was strengthened by the complete absence of change of QT after atenolol block and the absence of any detectable influence of vagal activity on ventricular repolarization during the reflex. Therefore, in what appeared to be the absence of evidence of autonomic influence, no inverse relationship between heart rate and QT was observed.     

A computer-automated laboratory for studying complex perception-action skills

In this paper, we describe a computer-based laboratory for collecting and analyzing real-time performance and eye-movement data by using video game-like tasks. These tasks assess skills that require the integration of varying numbers of perception and action components. Customized hardware and software are described for configuring tasks, collecting data, reconstructing performance, and organizing, editing, and reducing data. General design considerations are emphasized for solving several of the problems encountered in constructing a real-time data collection system. The paper concludes with examples of data that illustrate the system’s usefulness for studying complex perception-action skills.     

TEACHING CHOICE MAKING DURING SOCIAL INTERACTIONS TO STUDENTS WITH PROFOUND MULTIPLE DISABILITIES

We taught 4 students with profound multiple disabilities to use a microswitch communication system to request a change in recreational stimuli during social interactions with nondisabled peers. In Study 1, we conducted a preference assessment across a range of stimuli for each student. The most and least preferred stimuli were incorporated into microswitch communication system training in Study 2. During the second study, 3 of the 4 students (a) learned to use the microswitch communication system to control stimulus presentation, (b) more clearly differentiated their time among stimuli, and (c) increased their level of general alertness. Study 3 extended the use of the microswitch communication system to social interactions with nondisabled peers. Two students were more engaged in interactions when they chose when to change stimuli; 1 student was more alert when a peer chose when to change activities; a 4th student showed an undifferentiated pattern. The outcomes of the investigation are discussed in terms of the effects of controlling stimulus presentation on the behavior of students with profound multiple disabilities and the stability of preference hierarchies over time.     

EFFECTS OF SETTING EVENTS ON THE PROBLEM BEHAVIOR OF STUDENTS WITH SEVERE DISABILITIES

Two studies analyzed the effects of preceding setting events on the problem behavior of students with severe disabilities. Using ABAB withdrawal designs, the occurrence versus nonoccurrence of preceding setting events was analyzed in relation to the frequency of problem behavior. Data were collected throughout a student's school day, with interventions focusing upon the elimination of setting events that occurred before school. The results indicate that (a) the occurrence of preceding setting events was related to higher frequencies of problem behavior and (b) interventions designed to eliminate preceding setting events were consistently associated with low frequencies of problem behavior.     

The Psychotherapist–Patient Testimonial Privilege

The American Journal of Psychoanalysis -