NONCONTINGENT ESCAPE AS TREATMENT FOR SELF-INJURIOUS BEHAVIOR MAINTAINED BY NEGATIVE REINFORCEMENT

We extended research on the role of noncontingent positive reinforcement following a functional analysis of attention-maintained self-injurious behavior to self-injury maintained by negative reinforcement in 2 young males with developmental disabilities. During a pretreatment functional analysis, each participant's self-injury was shown to be differentially sensitive to escape from instructional activities as negative reinforcement. During noncontingent escape, escape from learning activities was provided on a fixed-time schedule that was not influenced by the participant's behavior. One participant was also exposed to differential negative reinforcement of other behavior. During this condition, escape from instructional activities was provided contingent on the omission of self-injury for prespecified intervals. Results showed that the provision of escape, even when noncontingent, resulted in significant reductions in self-injury. These results are particularly interesting in light of the experimental history of noncontingent reinforcement as a control rather than as a therapeutic procedure. Noncontingent escape is discussed as a form of extinction that may be less likely than other forms of extinction to produce severe side effects.     

Age-Related Changes in Plasma Catecholamine Responses to Acute Swim Stress

Young adult (3 months) and aged (22 months) Fischer 344 male rats were prepared with chronic tail artery catheters. Three days after surgery, rats were exposed acutely to swim stress at 20, 25, 30, or 35°C for 15 min. Blood samples were obtained from each rat under basal conditions, at the end of the swim stress episode, and 15, 30, and 45 min after swim stress. Basal plasma levels of norepinephrine and epinephrine (EPI) were similar for 3- and 22-month-old rats. In contrast, plasma catecholamine responses of aged rats were significantly greater than those of young adult rats following swim stress at 20 and 25°C. Plasma catecholamine responses were similar for rats of the two ages following swim stress at 30 or 35°C. These findings indicate that aged rats have exaggerated sympathetic-adrenal medullary responses to acute swim stress at the lower water temperatures. Given the modulatory effects of plasma EPI on memory, these age-related alterations in plasma catecholamine responses to acute swim stress may influence spatial memory performance of rats in the Morris water maze.     

NEGATIVE SIDE EFFECTS OF NONCONTINGENT REINFORCEMENT

Noncontingent reinforcement (NCR) has emerged as a treatment package for severe behavior problems. Although concerns about potential side effects (such as incidental reinforcement) have been raised, there have been few reported negative side effects in published studies to date. In this article, we report an NCR treatment evaluation for severe aggression that produced (a) an extinction burst and (b) incidental reinforcement. These side effects were evaluated by examining within-session response patterns and response distributions. As a solution, a brief omission contingency was added to the reinforcement schedule. The omission contingency resulted in decreased aggression rates.     

BERTRAND RUSSELL'S 1897 CRITIQUE OF THE TRADITIONAL THEORY OF MEASUREMENT

Synthese - The transition from the traditional to the representational theory of measurement around the turn of the century was accompanied by little sustained criticism of the former. The most...     

Daydreaming and curiosity: stability and change in gifted children and adolescents

Developmental differences in daydreaming and curiosity based on cross-sectional data have been reported, but longitudinal data are lacking. Patterns of longitudinal stability and change in two intellectual styles, daydreaming and curiosity, in gifted children and adolescents are described in this paper. Seventy-four intellectually gifted children attended a special program during two consecutive summers. Self-reports of their frequency of and attitudes toward daydreaming and two measures of their curiosity were obtained each year. The findings suggest a pattern of both change and stability in intellectual styles over time. Measures which tap the content of daydreams changed over time, but measures of process or ways of relating to the environment, such as curiosity and frequency of daydreaming, were fairly stable.     

Sex-role preferences in four age levels

Brown's (1956a; 1956b) influential finding that girls of all ages exhibit masculine rather than feminine sex-role preferences has been challenged by the argument that the scale used in his studies—the It Scale for Children (ITSC)—is masculine biased. The present investigation reexamined this issue with an instrument designed to be free of the limitations inherent in the ITSC. Boys and girls from grades 2, 5, 8, and 11 examined drawings of activities scaled for sex-role stereotypy and selected those activities they would like to engage in. Consistent with Brown's earlier work, boys exhibited strong masculine preferences at all ages. Contrary to Brown, however, girls did not show similar masculine preferences. Instead, their choices reflected strong feminine preferences throughout the spectrum of ages tested.     

The effects of dialogue-based task allocation on system performance in a computer-aided air traffic control task

The present study investigated dialogue-based human-computer task allocation. Five levels of allocation mode, four command strategies and a control condition, were examined in a high-task-load situation using a Latin square design. Five male participants acted as controllers in a simplified representation of an air traffic control system, sharing their task with a computer controller. Performance measures were metered on-line, and subjective ratings were recorded between trials. There were significant differences among the groups in the percentage of planes landed by the human-computer system, the total number of commands executed, and the number of allocation commands used. Other variables suggested for further study include comparisons of input mode, dialogue-initiation style, and degraded performance levels of the computer controller.     

Creative problem solving as a result of majority vs minority influence

A comparison of influence processes exerted by a majority versus a minority is made, both theoretically and empirically. In this study, comparing the two processes in the same experimental setting, it was hypothesized that subjects would ‘follow’ the majority more than the minority, that is, they would be more influenced to adopt the exact same position. However, it was predicted that subjects exposed to the minority would be stimulated to find new solutions to the problem, solutions that were not offered by the minority but that the subjects would not have found by themselves. Further, these solutions would tend to be correct rather than incorrect. Results support these predictions.