Genetic research,adolescents, and informed consent

The participation of adolescents in genetic research engenders unusual problems concerning the nature of their informed consent. In this study we analyze 70 consent documents collected from genetics investigators in the United States who conduct research with children and adolescents. We find that many consent documents do not reflect either the current or the developing ethical and legal standards for research with adolescents and that in many cases the documents are simply confusing or unclear. We make recommendations for change to reflect more adequately the changing perspective concerning the autonomous decision-making capacity of adolescents.     

Social inferences concerning male and female homeowners who use a gun to shoot an intruder

Two experiments were performed to test the hypothesis that gender stereotypes influence social inferences about homeowners who use a gun to shoot an intruder. It was predicted that homeowners who violate stereotypical norms would be perceived more negatively, and would be perceived as more responsible for the consequences of their weapon use than would homeowners of both genders who represent stereotype-consistency. The data from the first experiment provided some support for this notion. Male homeowners who shot incompetently were perceived more negatively than were men who shot the intruder with competence. The opposite trend was observed for female homeowners. The second experiment tested a refinement of this hypothesis and revealed how attitudes toward guns, specifically degree of acceptance of the notion that guns provide their owners with protection, moderates the social judgments formed about homeowners who use weapons as a means of defending their property during a burglary, Persons for whom the event is inconsistent with their attitude-based expectancies blamed the stereotype-inconsistent homeowners more than the gender stereotype-consistent homeowners, particularly the skillful female shooters. Individuals with relatively negative attitudes toward guns, in contrast, tended to perceive the skillful female shooters more positively than the other homeowners. Perceptions of weapons users who find themselves and their actions scrutinized by the media and the court system may depend upon perceivers' pre-existing category expectations and attitudes. © 1993 Wiley-Liss, Inc.     

Developmental differences in understanding of balance scales in the United States and Zimbabwe

This cross-cultural, developmental study of understanding of the physics of a balance scale involved 2 age groups (5- and 22-year-olds) in 2 countries (the United States and Zimbabwe). A factorial design was used. Each participant solved 6 types of balance scale problems, and the patterns of errors for these problem types were analyzed to determine which rules and concepts the participant used (e.g., whether number of weights was considered). As expected, on average, older participants were more accurate than younger participants, although significant age differences in the Zimbabwean sample were not found for problems solved by weight or distance cues. One finding differing from earlier research was that problems in which the beam balanced were more difficult for all participants. Generally, understanding of the physics of a balance scale appeared fairly similar in the 2 countries. Some cultural practices may account for the findings--in particular, the availability of preschool and age at time of academic specialization in higher education.     

Once a boring task always a boring task? Interest as a self-regulatory mechanism.

A process was proposed through which individuals regulate their motivation to perform necessary but uninteresting activities over time. If committed to continuing, individuals may engage in interest-enhancing strategies that can change the activity into something more positive to perform. In Study 1 Ss performed novel tasks and generated strategies to make regular performance interesting. In Study 2 Ss actually used these strategies primarily in conditions indicating a self-regulatory attempt: The task was currently boring, there was a perceived reason to continue (alleged health benefit), and a relevant strategy was available. Strategy use was associated with a change in activity definition and greater likelihood of subsequently performing the activity. In Study 3 Ss beliefs about how to maintain motivation to perform more everyday activities emphasized the importance of regulating interest relative to other self-regulatory strategies.     

Auditory frequency sensitivity in the neonate: a signal detection analysis.

Using signal detectability theory, an analysis was performed on some auditory frequency sensitivity data obtained in 1968 by Hutt et al. on human neonates. The d′-values over the frequencies from 70 Hz to 2kHz formed a significant cubic function. No state of arousal effects were found on sensitivity, as had been found in 1968. The β-values did not vary systematically with state, which suggests that levels of arousal should be studied separately. It is also suggested that the complex sensitivity found may provide a mechanism by which neonates may monitor their own vocalizations.     

Auditory frequency sensitivity of

Two studies were performed where five sinusoids, 125 Hz, 250 Hz, 500 Hz, 2 kHz, and 4 kHz, were presented to babies up to 9 days old along with several no-signal trials. Although variability in responding was the key result, a flat curve was representative of the intensities required for motor responding 50% of the time across the frequencies studied. In the second experiment, fixed intensities were chosen for each signal frequency, so d’ values could be estimated. The d’s differed over frequency. Evidence is cited that responding in the auditory response cradle which was used here varies with acoustic parameters. Some reasons are suggested as to why the newborns exhibit such variability.     

The effects of object weight on the kinematics of prehension

The purpose of these experiments was to determine the effects of object weight and condition of weight presentation on the kinematics of human prehension. Subjects performed reaching and grasping movements to metal dowels whose visible characteristics were similar but whose weight varied (20, 55, 150, 410 g). Movements were performed under two conditions of weight presentation, random (weight unknown) and blocked (weight known). Three-dimensional movements of the thumb, index finger, and wrist were recorded, using a WATSMART system to obtain information regarding the grasp and transport components. The results of the first experiment indicated that object weight and condition of presentation affected the temporal and kinematic measures for both the grasp and transport components. In conjunction with the results of a second experiment, in which time in contact with the dowel was measured, it was shown that the free-motion phase of prehension (i.e., up to object contact) was invariant over the different conditions, however. The changes were observed in the finger-object interaction phase (when subjects applied forces after contact with the dowel), prior to lift-off. These results were interpreted as indicating (a) object weight does not influence the planning and execution of the free-motion phase of prehension and (b) there are at least two motor control phases involved in prehension, one for making contact with the object and the other for finger-object interaction. The changing contributions of visual, kinesthetic, and haptic information during these two phases is discussed.     

Development of a measure of symptoms in chronic fatigue syndrome: The profile of fatigue-related symptoms(pfrs)

Abstract

Chronic fatigue syndrome (CFS) is a disorder of uncertain aetiology which attracts increasing research interest. This paper describes the development of a multidimensional measure incorporating the diverse symptoms associated with the illness. The Profile of Fatigue-Related Symptoms (PFRS) has four scales: emotional distress, cognitive difficulty, fatigue and somatic symptoms. These showed good convergence with comparison measures, high reliability and high internal consistency. CFS patients had markedly elevated scores compared with a student comparison group, and these scores correlated with indices of illness severity. The PFRS is a short and easily administered measure which, it is suggested, may be used to assess patients in terms of the severity and pattern of their disorder, to relate subjective symptoms to immunological and other findings, to evaluate the effects of treatments, and to compare the symptomatology of CFS with that in other fatiguing illnesses.