Active heading control in simulated flight based on vertically extended contours

In two experiments, we manipulated the properties of 3-D objects and terrain texture in order to investigate their effects on active heading control during simulated flight. Simulated crosswinds were used to introduce a rotational component into the retinal flow field that presumably provided the visual cues used for heading control An active control task was used so that the results could be generalized to real-world applications such as flight simulation. In Experiment 1, we examined the effects of three types of terrain, each of which was presented with and without 3-D objects (trees), and found that the presence of 3-D objects was more important than terrain texture for precise heading control In Experiment 2, we investigated the effects of varying the height and density of 3-D objects and found that increasing 3-D object density improved heading control, but that 3-D object height had only a small effect. On the basis of these results, we conclude that the vertical contours improved active heading control by enhancing the motion parallax information contained in the retinal flow.     

A behaviour modification technique for the hyperactive child

This paper describes a procedure for the conditioning of attending behaviour in a brain-injured hyperactive boy.

Observations of the behaviour of two hyperactive children were made in the classroom setting. These observations were made from an observation bootn adjoining the classroom and provided data on the frequency of occurrence of the following high rate responses: walking, talking, distraction, “wiggling”. Each child was observed for a minimum of ten minutes a day, four days a week. Following several weeks of baseline observation, the conditioning procedure was begun with the expel imental subject. The conditioning trials took place in the classroom setting. During each time interval in which one of the high rate responses did not occur, S received an auditory stimulus (secondary reinforcer). This auditory stimulus had previously been paired with the delivery of candy and pennies. The stimulus was dispensed by a radio device which activated an earphone worn by the subject. At the end of each conditioning trial, S received whatever candy or pennies he had “earned”.

The data show that the control subject showed no significant change in the frequency of occurrence of the high rate responses during the three month period. The experimental subject showed a significant decrease in non-attending behaviour. This reduction in rate was maintained over a four week extinction period.     

The development of antisocial behaviour patterns in childhood and adolescence

A developmental model of antisocial behaviour is presented in this paper. Arguments and evidence are presented for the position that although many factors such as parent criminality, social and economic disadvantage, child temperament, and marital discord systematically affect the development of antisocial child behaviour, their influence is mediated by the extent to which they disrupt day-to-day parenting practices. Particularly, it is argued that irritable, ineffective discipline and poor parental monitoring are the most proximal determinants of the early development and maintenance of antisocial behaviour. The implications of this model for prevention and intervention in child conduct problems are discussed, using examples of promising clinical work that focuses on direct parent training.     

Attitudes held by members of the clergy about alcohol

Alcohol, tobacco and other drug abuse continue to cause major threats to the physiological, psychological, sociological and spiritual health of the nation. According to recent statistics, over 80% of the illegal drugs used by youth, both male and female, is marijuana, with cocaine, opium and their derivatives comprising at least 15% of the drugs used by youth. When considering the ill effects of drug abuse, it is the legal one, alcohol that is responsible for the greatest impact on society. While it remains imperative that allied health professionals understand the many ramifications of substance abuse, it is also critical that leaders of faith communities have the knowledge and skills to meet this challenge competently. Due to the relevance of ministries as a possible resource, the focus of this exploratory study is to assess the knowledge, skills and attitudes of clergy about substance use and abuse and to determine their confidence of clergy in assisting their congregation with need related to this area.     

Factor structure of the Eyberg Child Behavior Inventory: a parent rating scale of Oppositional Defiant Behavior Toward Adults, Inattentive Behavior, and Conduct Problem Behavior

Used the Eyberg Child Behavior Inventory (ECBI) to measure disruptive behavior problems in children and adolescents. A controversy exists, however, on the dimensional structure of the ECBI. To evaluate this issue, an exploratory factor analysis was first performed on a sample of 1,263 children and adolescents. This analysis identified 3 meaningful factors (i.e., Oppositional Defiant Behavior Toward Adults, Inattentive Behavior and Conduct Problem Behavior) and a fourth, poorly defined factor. A confirmatory factor analysis (CFA) evaluated the fit of the 3 meaningful factors in a second sample of 1,264 children and adolescents. The 3-factor model with 2 correlated errors provided a excellent fit. This 3-factor model also provided a significantly better fit than 2- and 1-factor models. Multiple group CFA indicated that the factor pattern, item-factor loadings, factor correlations, and correlated errors were equivalent across the samples. The CFA on sex yielded similar results. Initial normative information is presented for boys (n = 1,322) and girls (n = 1,205) within 4 age ranges (i.e., 2-5, 6-9, 10-13, 14-17) for the 3 factors. The use of these 3 factors, especially Oppositional Defiant Behavior and Conduct Problem Behavior, should make the ECBI more useful as a screening and outcome measure.     

Chronically increased Gsalpha signaling disrupts associative and spatial learning

The cAMP/PKA pathway plays a critical role in learning and memory systems in animals ranging from mice to Drosophila to Aplysia. Studies of olfactory learning in Drosophila suggest that altered expression of either positive or negative regulators of the cAMP/PKA signaling pathway beyond a certain optimum range may be deleterious. Here we provide genetic evidence of the behavioral and physiological effects of increased signaling through the cAMP/PKA pathway in mice. We have generated transgenic mice in which the expression of a constitutively active form of Gsalpha (Gsalpha* Q227L), the G protein that stimulates adenylyl cyclase activity, is driven in neurons within the forebrain by the promoter from the CaMKIIalpha gene. Despite significantly increased adenylyl cyclase activity, Gsalpha* transgenic mice exhibit PKA-dependent decreases in levels of cAMP due to a compensatory up-regulation in phosphodiesterase activity. Interestingly, Gsalpha* transgenic mice also exhibit enhanced basal synaptic transmission. Consistent with a role for the cAMP/PKA pathway in learning and memory, Gsalpha* transgenic mice show impairments in spatial learning in the Morris water maze and in contextual and cued fear conditioning tasks. The learning deficits observed in these transgenic mice suggest that associative and spatial learning requires regulated Gsalpha protein signaling, much as does olfactory learning in Drosophila.     

The effects of age and task context on Stroop task performance

In this study, we investigated the impact of age and task context on Stroop task performance, using error scores, response latencies, and process dissociation estimates (e.g., Lindsay & Jacoby, 1994). Across three experiments, the findings showed that although older adults were able to evaluate Stroop task demands and modify their representations of task context in response to this knowledge, they were less able to maintain and update these representations on a trial-by-trial basis in tasks with high stimulus uncertainty or ambiguity. Moreover, although there was no age-related decline in the ability to modulate print color information, older adults were consistently less able to control the activation of conflicting word information. Together, these findings suggest that whereas age differences in the Stroop task may be magnified under conditions that promote transient failures to maintain task context, the primary source of these differences seems to be a more enduring decline in the efficiency of processes that are responsible for suppressing the activation of irrelevant lexical information.