EFFECTS OF EQUAL AND UNEQUAL REINFORCER DURATION DURING FUNCTIONAL ANALYSIS

In the functional analysis described by Iwata, Dorsey, Slifer, Bauman, and Richman (1982/1994), reinforcer duration varied across conditions (e.g., brief attention vs. 30 s of escape); this may result in unequal exposure to the establishing operations for aberrant behavior. In this study, we compared the effects of unequal and equal reinforcer duration during a functional analysis. The results showed that reinforcer duration affects the rate of aberrant behavior and may potentially alter functional analysis interpretation.     

Decomposition of a Rasch partial credit item into independent binary and indecomposable trinary items

For each Rasch (Masters) partial credit item, there exists a set of independent Rasch binary and indecomposable trinary items for which the sum of the scores and the partial credit score have identical probability density functions. If each indecomposable trinary item is further expressed as the sum of two binary items, then the binary items are positively dependent and cannot be both of the Rasch type. This paper was written while the author was working with Steve Ferrara and Hillary Michaels on some technical aspects of the Maryland School Performance Assessment Program. The author had been puzzled by the fact that most MSPAP assessment items have three or less score categories. With a psychometric justification now being apparent, this paper is dedicated to both of them.     

Evaluating teaching and students’ learning of academic research ethics

A team of philosophers and scientists at Dartmouth College worked for three years to create, train faculty and pilot test an adequate and exportable class in research methods for graduate students of science and engineering. Developing and testing methods for evaluating students’ progress in learning research ethics were part of the project goals. Failure of methods tried in the first year led to the refinement of methods for the second year. These were used successfully in the pilot course and in one university setting external to Dartmouth. The process of development and justification for the final methods are discussed here.     

Separate Digits tests: A brief history,a literature review,and a reexamination of the factor structure of the test of memory and learning (TOMAL)

Following a brief history of Digit Span, a review of 27 articles, selected from 76, addresses the question of whether to scale Digits Forward and Backward separately. The review begins with studies involving Digits Forward, followed in turn by studies of Digits Backward and of both subtests. Finally, the loadings of four TOMAL subtests, Digits Forward and Backward and Letters Forward and Backward, undergo examination in the context of two, three, and four factor promax solutions, with corresponding varimax solutions provided for comparison. The analysis leads to several conclusions. Though Digits Forward and Backward show similarities, they load differently in the three and four factor solutions; Digits Backward also displays a spatial element, and perhaps a transformative element, not apparent in Digits Forward. Moreover, the differences between the two measures have important neurologic and diagnostic implications.     

In vivo functional assessment and multi-element interventions for problem behaviors of students with disabilities in classroom settings

Persons with developmental disabilities often do not follow instructions or complete tasks in educational settings, thus further disadvantaging themselves as they try to lead more normalized lives. The purpose of this paper was to address the problems of three persons referred for not following instructions and for engaging in associated behavior problems (e.g., crying, hitting, throwing materials) when given instructions. A functional assessment was conducted in the natural school setting without any prescribed conditions as in analogue functional assessments. Results of the assessments showed that problem behaviors for two subjects occurred much more in demand conditions requiring active responses than in demand conditions requiring passive responses. The results for a third subject showed problem behaviors were associated with toileting demands, less so with other demand conditions, but not with conditions in which there were an absence of demands. Individualized multi-element interventions were based on the negative reinforcement hypothesis and were intended to make tasks less aversive and to make instructions easier to understand. Results of the interventions showed increases in task engagement and decreases in problem behaviors during the active tasks and toileting tasks for which interventions were programmed, as well as for the passive tasks and other demand conditions for which no interventions were programmed. Results were discussed in terms of the value of functional assessments in directing therapists to base interventions on hypotheses of the function of the presenting problem.     

Legal and ethical issues in conducting research on alcohol and drug use with children: a reaction to Havey and Dodd

Although research pertaining to alcohol and drug use by children clearly is very important for our field, it also presents a number of difficult ethical and legal challenges. In this article we react to Havey and Dodd's research (1995, this issue), commenting specifically on their use of a passive consent procedure. Problems with this aspect of their methodology are reviewed in relationship to best research practices, the U.S. Constitution, case law, federal statutes, and the ethical codes of the American Psychological Association, the National Association of School Psychologists, and the American Educational Research Association.     

EFFECTS OF SUBJECT- VERSUS EXPERIMENTER-SELECTED REINFORCERS ON THE BEHAVIOR OF INDIVIDUALS WITH PROFOUND DEVELOPMENTAL DISABILITIES

Results from a number of studies have shown that individuals with profound developmental disabilities often show differential approach behavior to stimuli presented in a variety of formats, and that such behavior is a reasonably good predictor of reinforcement effects when these “preferred” stimuli are used subsequently in a contingent arrangement. Recent data suggest that reinforcement effects may be enhanced further by allowing individuals to select, just prior to training sessions, which (of several) preferred stimuli would be used as reinforcers, but whether this method is superior to one based on selection by a teacher or therapist has not been adequately addressed. We compared the effects of these two methods of reinforcer selection on rates of responding on a free-operant task, using stimuli previously identified as potential reinforcers. Results obtained with 4 subjects indicated little or no difference in reinforcement effects when stimuli were selected by subjects rather than experimenters. Implications of these results with respect to choice and its relation to reinforcement are discussed.     

THE DIFFERENTIAL EFFECTS OF TEACHER AND PEER ATTENTION ON THE DISRUPTIVE CLASSROOM BEHAVIOR OF THREE CHILDREN WITH A DIAGNOSIS OF ATTENTION DEFICIT HYPERACTIVITY DISORDER

We conducted functional analyses of classroom disruption during contingent teacher and peer attention conditions for 3 children with attention deficit hyperactivity disorder. Attention provided by peer confederates appeared to function as a distinct form of positive reinforcement for all 3 children.     

The use of the mental development index of the Bayley scale to diagnose language delay in 2-year-old high-risk infants

To determine if a detailed analysis of the language items of the Bayley Scales of Infant Development (BSID) would be useful in detecting language delay, the Bayley Mental Development Index (MDI) and Reynell Developmental Language Scales (RDLS-R) were administered to 137 low-birthweight infants at 2 years of age. In spite of scores in the normal range on the BSID, many of these children had significantly delayed language. However, the children with delayed language could be detected on the basis of detailed analysis of certain language items of the MDI, indicating that these items are more useful than the total MDI score.     

THE REPRESENTATIVENESS OF OBSERVATIONAL SAMPLES OF DIFFERENT DURATIONS

The representativeness of behavioral observation samples with durations of less than the whole time of interest was investigated. A real-time recording system was developed to quantify the behavior of 5 profoundly mentally retarded physically handicapped adult students in an institutional training setting. Behavior was observed using six mutually exclusive and exhaustive categories during 2.5-hr observation sessions. Sample observation sessions with durations ranging from 15 to 135 min were computer simulated from the whole-session (150-min) records. It was found that the representativeness of these samples, when compared to whole-session records, was a function of the relative duration of the behavioral categories and of sample duration. The occurrence of relatively high-duration behaviors (lasting for more than 50% of the session) was estimated to within 20% error by samples of less than 60 min, but low-duration behaviors (1 to 3% of the session) were inadequately quantified even from 135-min samples. Increasing irregularity of bouts of behavior in the low-duration behaviors is suggested as the cause of the functions obtained. Implications of the findings for applied behavior analysis are discussed, with the recommendation that the adequacy of observational session durations be empirically assessed routinely.