Laterality differences and shifts as a function of tactile temporal pattern complexity: Implications for differential processing strategies of the cerebral hemispheres

Summary The ability of subjects with a right-hand or left-hand preference to report accurately the number of tactile pulses in temporal sequences presented to preferred and nonpreferred hands was investigated as a function of temporal pattern complexity which varied in terms of intrinsic temporal relations among successive pulses and ranged from slow regular (periodic) sequences of small numbers of pulses to fast irregular (aperiodic) sequences of large numbers of pulses. As the complexity of the pattern increased in terms of pulse number, presentation rate, pulse density, and pulse aperiodicity, all subjects, for both preferred- and nonpreferred-hand stimulation, were increasingly less accurate in reporting the number of pulses in a temporal pattern. Most interesting was the finding that although hand-preference groups did not differ reliably in overall report accuracy, both groups showed a consistent shift in report accuracy from preferred- to nonpreferred-hand stimulation when patterns had more than seven pulses; furthermore, these shifts occurred for all presentation rates and pulse periodicities. A possible relationship between hand preference and cerebral psychological organization is suggested and the data are discussed in terms of the laterality differences reflecting basic underlying cerebral asymmetries in stimulus processing.These investigations were supported by Grant A8621 from the National Research Council of Canada. This paper was prepared while the author was a Visiting Researcher at the Department of Psychology, University of Stockholm, and supported, in part, by a Leave Fellowship awarded by the Social Sciences and Humanities Research Council of Canada. I would like to thank Gordon Tanne for his assistance in data collection and analysis. Requests for offprints should be sent to E.C. Lechelt, Department of Psychology, University of Alberta, Edmonton, Alberta, Canada T6G 2E9.     

A typology of mid-life career changers

This study examines the motivations for and the outcomes of mid-life career change among a sample of 73 men who had left professional and managerial careers between the ages of 34 and 54. Measures of personal desire for change and external pressure to leave were dichotomized to produce a typology of career changers: Drift-outs, Opt-outs, Force-outs, and Bow-outs. The four types of changers were found to differ on a number of variables, including: amount of education completed, additional schooling undertaken to change careers, time taken to make the change, radicalness of change, and the importance of personal values in deciding to leave their former careers. Overall, respondents were found to be highly satisfied with their career redirection.     

The informational basis of social judgments: Memory for informative and uninformative arguments

This study investigates the encoding and retrieval of arguments in an opinion formation task. It is based on a model of opinion formation that partitions the latter process into initial encoding, elaborative encoding, integration, and decision. According to this model elaborative encoding depends on two factors: (i) the informativeness of the arguments and (ii) their thematic relatedness. Since it is reasonably well established that the likelihood of retrieving an argument is an increasing function of the amount of elaboration performed on it, the first hypothesis is straightforward, namely, that the memory for an argument will increase with its informativeness and with its thematic relatedness to other arguments. The second hypothesis assumes that by dint of their closer association with the decision, informative arguments occupy a more central position in the representation of an opinion than uninformative ones. This implies that an informative argument should be accessed and reported prior to an uninformative argument, even when differences in retrievability (i.e., probabilities of recall) are controlled. The findings were consistent with such an analysis.     

Memory for words in prose and their locations on the page

Two experiments are reported that establish that the recall of the within-page spatial location and the content of words from a prose passage are not functionally independent, i.e., that each can serve to cue recall of the other. Depriving college students of the spatial-location cues on a page by having them read a passage in the continuous form from a scroll significantly lowered word recall, whereas providing them with cues that reinstated the within-page location of material at time of test significantly raised recall of words. Providing the content of answers to the questions at time of recall was found to increase memory for location. The data are consistent with a conception of memory as a constellation of features such that recall of one of these features serves a cuing function to facilitate recall of other features.     

Training Genetic Counselors to provide teratogen counseling

Provision of teratogen counseling requires acquisition of knowledge and skills from several disciplines. Traditionally, training in teratogen counseling has occurred on the job. We describe a formal, didactic and experiential curriculum for teratogen counseling as an integral part of the Graduate Program in Genetic Counseling leading to the master of science degree at Northwestern University. All students complete a 5-week rotation with the Coordinator of the Illinois Teratogen Information Service (TIS). This provides them with an opportunity to evaluate a spectrum of teratogen exposures, to interpret teratogen studies in a manner useful for patients, and to develop skills in assessing and addressing psychosocial issues associated with fetal exposure to potential teratogens. Students also learn first hand about how a TIS functions and when and how to refer to TIS specialists. The goal of the program is to provide genetic counseling students with the opportunity to gain experience in accessing and interpreting teratology research and in communicating teratogen information to patients and health professionals in a sensitive, effective manner.     

Non-equilibrium dynamics as an indispensable characteristic of a healthy biological system

Healthy systems in physiology and medicine are remarkable for their structural variability and dynamical complexity. The concept of fractal growth and form offers novel approaches to understanding morphogenesis and function from the level of the gene to the organism. For example, scale-invariance and long-range power-law correlations are features of non-coding DNA sequences as well as of healthy heartbeat dynamics. For cardiac regulation, perturbation of the control mechanisms by disease or aging may lead to a breakdown of these long-range correlations that normally extend over thousands of heartbeats. Quantification of such long-range scaling alterations are providing new approaches to problems ranging from molecular evolution to monitoring patients at high risk of sudden death. We briefly review recent work from our laboratory concerning the application of fractals to two apparently unrelated problems: DNA organization and beat-to-beat heart rate variability. We show how the measurement of long-range power-law correlations may provide new understanding of nucleotide organization as well as of the complex fluctuations of the heartbeat under normal and pathologic conditions.     

Technology and civil disobedience: Why engineers have a special duty to obey the law

Summary Engineers have a greater responsibility than many other professionals not to commit civil disobedience in performing their jobs as engineers. It does not follow that engineers have no responsibility for their company’s actions. Morally, engineer may be required to speak out within the company or even publicly against her company. An engineer may be required to work on a project or quit her job. None of these acts, generally, are against the law. An engineer may be morally required to commit civil disobedience as a private citizen. But, given the institutional character of engineering and the division of labor in the modern world, very rarely will conscience require an engineer to violate the law in the performance of her job as an engineer.     

Some nontraditional (Unconventional and/or innovative) sychosocial treatments for children and adolescents: Critique and proposed screening principles

Five examples of nontraditional psychosocial treatments used for children/adolescents are reviewed: eye movement desensitization and reprocessing, electroencephalographic (EEG) biofeedback, deep pressure/touch therapies, stress-challenge treatments, and confrontational scare treatments. The generic recommendations from the September 1992 National Institutes of Health Conference on Unconventional Medical Treatments are summarized. Additional screening principles specific for psychosocial treatments are proposed and applied to the five treatments. The screens do not validate treatment efficacy or evaluate the quality of any previous research, but only facilitate decisions as to whether treatments deserve controlled investigation. Scientific evaluation of the nontraditional treatments reviewed could in general benefit from blinds (at least for assessment); control conditions matched for intensity, frequency, and duration (double blind where feasible); dose-response studies; testing of generalization and endurance supplements or boosters for quick, cheap treatments with time- or domain-limited effects; and comparing cost-effectiveness with established treatments. Two unscientific pitfalls must be avoided: embracing new treatments uncritically and rejecting them without fair examination. These pitfalls must be skirted without dissipating scarce research resources.The views and proposals in this article are those of the author, and do not in any way reflect any official National Institute of Mental Health (NIMH) position. Further, mention or review of any particular treatment does not constitute endorsement of that treatment by either NIMH or the author.     

Computer-Based Assessment: A NATO Survey

The purpose of this paper is to provide a brief summary of developments in NATO nations in order to bring these developments to a wider audience. The basis of the survey provided is the information collated by NATO Research Study Group 15 Computer-Based Assessment of Military Personnel as given in its report to NATO Headquarters in 1993.     

Of Nobel class: A citation perspective on high impact research authors

The purpose of this paper was to determine if quantitative rankings of highly cited research authors confirm Nobel prize awards. Six studies covering different time periods and author sample sizes were reviewed. The number of Nobel laureates at the time each study was published was tabulated, as was the number of high impact authors who later became laureates. The Nobelists and laureates-to-be were also compared with non-Nobelists to see if they differed in terms of impact and productivity. The results indicate that high rankings by citation frequency identify researchersof Nobel class — that is, a small set of authors that includes a high proportion of actual Nobelists and laureates-to-be. Also, the average impact (citations per author) of Nobelists and laureates-to-be is sufficiently high to distinguish them from non-Nobelists in these rankings. In conclusion, a simple, quantitative, and objective algorithm based on citation data can effectively corroborate —and even forecast — a complex, qualitative, and subjective selection process based on human judgement.