Evaluation of a preventive intervention for a self-selected subpopulation of children

Evaluated an experimental preventive intervention developed for children who perceived their parents as problem drinkers. The 8-session program was designed to improve children's coping, self-esteem, and social competence, and modify alcohol expectancies which were specified as mediators of the effects of parental alcohol abuse on child mental health. Participants were 271 self-selected 4th-, 5th-, and 6th-grade students in 13 schools. The children were randomly assigned to treatment or delayed treatment conditions and the program was given to three successive cohorts of students. A meta-analysis across three different cohorts indicated significant program effects to improve knowledge of the program content and the use of support- and emotion-focused coping behaviors for the full sample. A slightly stronger range of effects was found for a high-risk subsample. This research was funded by the National Institute of Mental Health Grant P50-MH39246 to support a Preventive Intervention Research Center and Prevention Training Grant T32-MH18387-02.     

Differential thresholds for limb movement measured using adaptive techniques.

Differential thresholds for limb movement were measured in 10 subjects, using the transformed up-down procedure. Subjects were required to indicate which of two random displacement perturbations delivered to their forearms had the larger standard deviation (SD). The SD of the reference signal was fixed for each experimental condition at one of seven values ranging from 0.05 to 3.2 mm. THe SD of the other signal varied depending on the subject's response. Using this procedure, the differential threshold for limb movement was calculated to be 8%, which is very similar to the thresholds estimated previously for changes in limb position (9%) and force (7%). The sensitivity of the human proprioceptive system to changes in limb displacement was much greater than anticipated, with subjects being able to resolve a 5-microns difference between two perturbations delivered to their arms.     

A Behavior Analytic Interpretation of the Therapeutic Relationship

The paper examines, from a behavior analytic perspective, the mechanisms through which change occurs within the context of the therapeutic relationship in individual psychotherapy. The analysis focuses upon the therapist’s shaping of the client’s behavior through subtle nonverbal cues and explicit verbal analyses. In the relationship, therapists modify behavior that has created difficulties for the client in the natural environment, and clinical change is dependent upon the extent to which those in the natural environment will reinforce functionally similar response classes. Ferster’s distinction between natural and arbitrary reinforcement and Skinner’s distinction between contingency-shaped and rule-governed behavior are also used to describe the manner through which change occurs. The goal of the paper is to stimulate behavior therapists to look more closely at the therapeutic relationship as a mechanism of clinical change and to help those of other perspectives see how their effectiveness within the relationship can be understood using the principles of learning.

     

Duration of visible persistence in relation to stimulus complexity

Visible persistence refers to the phenomenal impression that a stimulus is still present after its offset. A dispute exists whether visible persistence is due to temporal sluggishness in the visual pathway (neural hypothesis) or whether it is a byproduct of information-extraction processes under cognitive control (process hypothesis). This was investigated by manipulating stimulus complexity in five temporal integration experiments and one recognition memory experiment. According to the process hypothesis, complex stimuli should persist longer than simple stimuli because they require more information extraction. This prediction was not confirmed; in all six experiments, complexity was found to have no reliable effect on the duration of visible persistence. By contrast, and in accordance with earlier findings, complexity was shown to have a significant effect on a short-lived, nonvisible form of memory known as schematic persistence. This pattern of results supports two major conclusions: First, that the effects of complexity reported in earlier research were probably on schematic—rather than visible—persistence; and second, that visible persistence must be regarded as a residual neural trace of an extinguished stimulus, rather than as a byproduct of information-extraction processes.     

Information integration across saccadic eye movements

The visual world contains more information than can be perceived in a single glance. Consequently, one's perceptual representation of the environment is built up via the integration of information across saccadic eye movements. The properties of transsaccadic integration were investigated in six experiments. Subjects viewed a random-dot pattern in one fixation, then judged whether a second dot pattern viewed in a subsequent fixation was identical to or different from the first. Interpattern interval, pattern complexity, and pattern displacement were varied in order to determined the duration, capacity, and representational format of transsaccadic memory. The experimental results indicated that transsaccadic memory is an undetailed, limited-capacity, long-lasting memory that is not strictly tied to absolute spatial position. In all these respects it is similar to, and perhaps identical with, visual short-term memory. The implication of these results for theories of perceptual stability across saccades are discussed.     

The use of structural equation modeling in generative research: Toward the design of a preventive intervention for bereaved children

Describes a generative study of processes which may lead to symptomatology in children who have experienced the death of a parent. Based on existing literature, four putative mediating variables were identified: parental demoralization, family warmth, negative family events, and positive stable family events. Structural equation modeling techniques were used to compare several potential causal models involving these variables. The results were most consistent with a model in which bereavement was not directly related to the child symptomatology, but rather its effects were transmitted through these four mediational mechanisms. The implications of the results of the structural modeling for the design and evaluation of preventive interventions are discussed briefly.     

Stability and quality of life events and psychological symptomatology in children of divorce

Studied the relations between postdivorce events and maladjustment of children of divorce using a two-dimensional model of events. One dimension concerned the stability of events and included whether they were increases, decreases, or the continuation of stable conditions. The second dimension was quality, and included whether they had a positive or negative valence. Two samples of children of divorce (ns = 142 and 64) ages 8-15 were studied. Children's overall maladjustment as reported by children and parents were the criterion variables. Scores were derived from a life events schedule for children of divorce to assess the occurrence and stability of positive and negative divorce-related events. The relations between event scores and maladjustment were different when children's self-reports and parent reports were used as criterion. In predicting children's self-reported maladjustment (a) stable positive events but not changes in positive events were related to lower maladjustment (b) increased negative events were related to higher maladjustment, and (c) change for the worse was related to higher maladjustment. In predicting parent reports of children's maladjustment, only the relations of the change for the worse score were replicated. Implications of the results for the design of preventive interventions and for the study of children in stressful situations are discussed.     

Small theory and the strategic choices of prevention research

Our comments on the discussion of mediational screening for prevention research highlight two issues: (a) There are advantages to giving a high priority to theory in a strategic sequence of prevention research studies. (b) Screening to identify a subgroup that is experiencing problems on processes the program is designed to change may be useful in accomplishing specific goals within an overall strategy of prevention research studies.     

An area theorem for thesame-different experiment

If observers in a same-different experiment base their decisions on the absolute difference between observations on a trial, the area under the receiver operating characteristic equals the maximum proportion of correct decisions that an unbiased independent-observations observer could attain. Even though the differencing strategy is suboptimal,the area measure yields an index of optimal performance.