Effects of reinforcement on concept identification in hyperactive children

The effects of continuous and partial reward on the performance of hyperactive and normal children on a concept identification task were compared. Because reduction in information feedback is usually associated with partial reward schedules, the study was designed to yield information regarding the contribution of reduced feeback to performance in the partial reward condition. Previous findings of a performance deficit in hyperactives under partial reward were replicated. The findings help rule out an information feedback explanation for this deficit. The authors suggest that a motivational factor involving the elicitation of frustration when expected rewards fail to appear may be responsible for the poor performance of hyperactives on the partial schedule.This research was supported by Grant No. 943-03-34 from the Social Sciences Research Fund, McGill University.     

Assessment of a cognitive training program for hyperactive children

Modeling, self-verbalization, and self-reinforcement techniques were used to train hyperactive children in more effective and less impulsive strategies for approaching cognitive tasks, academic problems, and social situations. Eighteen hyperactive children took part in the training program. The control group, which received no training, consisted of 11 children, matched with the experimental group on age, IQ, and measures of hyperactivity and impulsivity. Several tests and measures, some of which have been shown to differentiate between hyperactive and normal children, were administered prior to training, at the end of the 3- month training period, and after a further 3- month period in which no training took place. The trained group showed significantly greater improvement on several of the measures, both at the time of posttesting and on the follow-up evaluation.This research was supported by Canada Council Grant #S74-0750, principal investigator, Virginia I. Douglas.     

Preselection and response biasing in short-term motor memory

Two experiments were performed comparing preselected (subject defined) and constrained (experimenter defined) movements. In the first experiment, subjects made reproduction responses immediately or under unfilled and filled 15-sec retention intervals. Results indicated that recall of preselected movements was clearly superior until the interpolation of information processing activity. In addition, preselected movements demonstrated no forgetting over a 15-sec retention interval while constrained movements evidenced spontaneous memory lass, suggesting that preselected movements possess a stronger representation in memory. The second experiment examined this interpretation in a response biasing paradigm. Subjects made criterion responses under preselected or constrained conditions, while the interpolated movement was always in the constrained mode and ± 40 deg from the criterion. The subjects' task was to attend to both movements and recall each when instructed. While preselected recall was clearly superior' to constrained recall, response biasing was clearly evident in both. The failure to find differential biasing effects was discussed in terms of the relative trace strength hypothesis (Stelmach & Welsh, 1972).     

Effects of War-Induced Maternal Separation on Children's Adjustment During the Gulf War and Two Years Later1

Military personnel deployed to the Middle East included an unprecedented number of women, many of whom were mothers. Using a structural equation modeling approach, we examined the predictors of children's adjustment problems in data collected from a representative sample of 263 Air Force mothers 2 years after the Gulf War. Using a retrospective survey, we found that the main predictors of children's adjustment problems at the time of the war were mothers' difficulties in providing for the care of the children, mothers' deployment in the theater of the war (vs. deployment elsewhere), and degree of change in children's lives. Most important, war-related adjustment problems were not related to children's adjustment 2 years later, suggesting that the effects of maternal separation during the war were transient.     

The allocation of memory resources during sentence comprehension: Evidence from the elderly

Two experiments were carried out to examine the ability of elderly subjects to establish syntactically governed dependency relations during the course of sentence comprehension. The findings reveal the manner in which memory constraints operate during syntactic processing.     

Rousseau's Political Defense of the Sex-roled Family

We argue that Rousseau's defense of the sex-roled family is not based on biological determinism or simple misogyny. Rather, his advocacy of sexual differentiation is based on his understanding of its ability to bring individuals outside of themselves into interdependent communities, and thus to counter natural independence, self'absorption and asociality, as well as social competitiveness and egoism. This political defense of the sex-roled family needs more critique by feminists.