The problem-solving strategies of kindergarten and first-grade children during discrimination learning

Kindergarten and first-grade children (6 and 7 years of age, respectively) were given specially designed discrimination tasks with introtact probes preceding each trial. One group (CON) was given the criterion task without prior training. A second group (LTL) received three pretraining tasks of the same type as the criterion task. A third group (HYP) received the same pretraining tasks, but with explicit instructions designed to teach a simple hypothesis-testing strategy. Several indices, designed to reflect the use of win-stay and lose-shift rules, as well as memory for disconfirmed hypotheses, were computed from the protocols of the criterion task. The indices for Group CON suggested that most of these children were using a guessing strategy that involved quite frequent changes in hypotheses. Moreover, many of these children restricted their hypotheses to the irrelevant cues. The indices for Group LTL revealed a spontaneous use of the hypothesis-testing strategy by nearly half of the children. The results for Group HYP indicated that over four-fifths of these children became highly efficient in the use of the problem-solving strategy.     

Laboratory and field interview methods for the study of shiftworkers

Gordon, Tepas, Stock, and Walsh (1979) describe the manner in which shiftworkers were selected as research subjects through the cooperation of labor union organizations. In this paper, we describe the methods used to select and orient the workers to serve in a laboratory study involving measurement of the psychophysiological correlates of sleep. Procedures used for field interviews with the same subjects are also described. Some of the advantages and disadvantages of using a multimethod (laboratory and field interview) approach to the study of shiftwork effects are detailed.     

The spouse subsystem in the family context: couple interaction categories

Within a semi-structured family interview (the McMaster Stuctured Interview of Family Functioning), several questions focus on intimate areas of the marital relationship. How couples answer these questions provides a window into their style of communication around potentially stressful issues. Viewing their videotaped interactions while noting their gaze patterns, dialogue, tension, and attitude, produced the following categories: Adaptive, Stable, Co-operative, Disengaged/anxious, Parallel, or Failing. Inter-observer relability was high, and the categories were related in meaningful ways to a self-report questionnaire, the McMaster Family Assessment Device, completed independently by each parent.     

The human genome project: A public forum. Report on a model conference for genetics professionals and consumers

This paper reports on the rationale, objectives, and outcome of a conference titled The Human Genome Project: A Public Forum. One of the distinguishing features of this conference was that it included both genetics professionals and consumers of genetics services in a dialogue about the potential ethical, legal, and social implications of learning more about one's genes. The conference was planned to yield two products: (1) a set of recommendations for planners of future educational, research, and public policy efforts related to the Human Genome Project; and (2) an assessment of participants' pre- and post-conference knowledge and opinions about the Human Genome Project.     

Methylphenidate Does Not Modify the Impact of Response Frequency or Stimulus Sequence on Performance and Event-Related Potentials of Children with Attention Deficit Hyperactivity Disorder

Twenty-six children with attention deficit/hyperactivity disorder (ADHD) participated in a double-blind trial consisting of 2 consecutive weeks each of placebo and methylphenidate (M = 26.92 mg/day = 0.78 mg/kg/day). As expected, stimulant therapy resulted in moderate weight loss, increased somatic complaints, and teacher and parent reports of reduced inattentiveness, aggression, and oppositionality. In both phases of the trial, patients were tested in a choice reaction time task assessing two aspects of the task that presumably affect response selection: response frequency (ratio of targets/nontargets = 25/75 vs. 50/50) and stimulus sequence (alternations vs. repetitions). Both manipulations yielded expected results on performance and event-related potentials (ERPs). Stimulant treatment increased accuracy and speed among younger children and curtailed variability of reaction time for the sample as a whole. However, methylphenidate did not affect ERPs. In combination, the results imply that the enhancement of performance by methylphenidate does not involve the demands of response selection examined in this study.     

Interpretation of the personality inventory for children-revised (PIC-R): Influence of cognitive impairment

The Personality Inventory for Children-Revised (PIC-R) is a parent-report measure of social-emotional adjustment for children 3 to 16 years of age. The present study examined the clinical value of the PIC-R by exploring the impact of age and developmental status on PIC-R profiles, particularly on the Psychosis (PSY) scale, within a sample of preschool and school-age children referred for assessment of suspected cognitive impairment and learning problems. Compared to school-age children, significantly more preschoolers obtained elevated scores on the Psychosis scale; those preschoolers with cognitive impairments were even more likely to obtain significantly elevated Psychosis scale scores, despite the absence of diagnosed childhood psychosis. No significant relationship was found between Psychosis scale elevations and cognitive impairment in the school-age group. The PIC-R was moderately accurate in identifying cognitively impaired preschoolers but only minimally accurate in identifying cognitively impaired school-age children.     

Comprehension and production of the /−ez/ plural allomorph

Children's knowledge of morphological elements has traditionally been tested using Berko-type production tasks. Failure to respond correctly in this task may reflect production constraints independent of underlying linguistic knowledge. Accordingly, a detailed comparison of the comprehension of one morphological unit the /–ez/ plural allomorph, was investigated. Two groups of subjects were tested: (1) those who produced this allomorph correctly and (2) those who failed to produce it. For the subjects as a group, the results indicated that children who could produce the /–ez/ allomorph in nonsense word contexts performed significantly better than children who were unable to produce this allomorph. An analysis of individual performance indicated that almost all of the subjects who produced the /–ez/ allomorph correctly reliably comprehended it. A little more than half of the subjects who failed to produce it evidenced reliable comprehension. The conclusion was drawn that comprehension learning precedes production learning and that production-type tasks may consistently underestimate linguistic knowledge.This paper was supported by the Graduate College, University of Missouri, Kansas City.