Developing realistic stimuli for assessing observers' perceptions of male and female body types.

The goal of this research was to create more realistic stimuli for research in assessing observers' perceptions of male and female body types. Stimuli were developed by classifying large samples of photographs and using representative photographs to illustrate body types. Resultant stimuli go beyond current stereotypic stimuli to provide realistic representations of commonly occurring body types among men and women ages 18 ro 40 years. Realistic stimuli can be used in a wide range of research both to understand observer perceptions and to teach the reality of human variation.     

Psychometric functions and a correlation model of binaural detection

Sets of psychometric functions for the detection of tone in noise are reexamined for several interaural listening conditions. Best-fit sets of functions are determined for a “correlation” model of binaural masking level differences (MLDs). Based on only three parameters, this model predicts both the forms and relative positions of all such functions. The finding that MLDs are relatively independent of the detection level chosen for their determination is predicted by the model, and the sets of theoretical functions describe the data nearly as well as a previously determined empirical relation which requires M + 1 parameters for M curves.     

Let's pretend: The role of motoric imagery in memory for sentences and words

A number of theories suggest that for young children, concepts should have an important motoric (or sensory-motor) component. A levels-of-processing theory is proposed which predicts that processing on motoric imagery should facilitate memory for both isolated words and for sentences. Experiment 1 examined the effects of motoric enactment (viz., pretend play) of sentences on memory for the sentences. Motoric imagery facilitated memory for both children (5 to 7 years of age) and adults, though, contrary to expectations, the effects were weaker for the children than for the adults. Further, it was found that motoric imagery affected the initial acquisition, but was not important as a retreival cue. Experiment 2 examined the effects of motoric imagery on free recall of lists of unrelated words. Under these conditions, motoric imagery facilitated memory for both children (7 to 9 years of age) and adults equally; in contrast, visual imagery instructions had no effect on memory. These results indicate that motoric imagery may facilitate memory under conditions in which visual imagery has no effect. Theoretical implications are explored for previous experiments on pretend play which suggest that training for pretent enactment can facilitate cognitive development.     

Contribution of age, genes, and environment to the relationship between perceptual speed and cognitive ability

The aim of this study was to examine genetic influences on cognitive ability in adulthood in the context of the relationship between perceptual speed and cognitive aging. Quantitative genetic analysis of data from the Swedish Adoption/Twin Study of Aging allowed for estimation of the contribution of age, genetic, and environmental effects to the variance in a latent cognitive factor and to the covariance between the cognitive factor and perceptual speed. The sample included 292 pairs of monozygotic and dizygotic twins. both reared together and reared apart, ranging in age from 40 to 84 years. Analysis of components of total variance in the cognitive factor indicated that 90% of the age-related variance in the cognitive factor was shared with perceptual speed and 70% of the genetic variance in the cognitive factor was shared with perceptual speed. The correlation between the speed and cognitive factors was primarily genetically mediated.     

Heidegger and Korsgaard on Death and Freedom: The Implications for Posthumanism

Prominent advocates of posthumanism such as Nick Bostrom and Ray Kurzweil make the case that a drastic increase in the human lifespan (or healthspan) would be intrinsically good. This question of the value of an extended lifespan has perhaps become more pressing as medical and scientific advances are seemingly bringing us closer and closer to being able to extend our lives in the way posthumanists envision. In this paper I intend to use Martin Heidegger’s work on death and freedom to develop a potential objection to the claim that an indefinite healthspan is intrinsically desirable. The basic plan will be to make the case that the structure of human agency is such that truly free action is possible only on the basis of the essential finitude of our existence. Assuming that we take this sort freedom to be an important good, we would lose something of crucial importance if we were to radically extend the human healthspan. I am not claiming to present an entirely conclusive argument against posthumanism, or even enhancing the human healthspan to posthuman proportions, but rather, I see my argument here as adding another currently valued dimension of human existence that could very well be lost if we move decisively in the posthumanist direction.     

Urban Aboriginal‐Australian and Anglo‐Australian children: in‐group preference,self‐concept,and teachers' academic evaluations

The in‐group preference and self‐concepts of urban Aboriginal‐Australian and Anglo‐Australian children have never been compared, nor their relationships to teachers' evaluations of academic performance. In this study, 60 Aboriginal (primarily local Nyoongah) and 60 Anglo children aged 6–12 years were tested on in‐group preference; children aged 8+ were tested on self‐concept. Also, their teachers evaluated them on their general academic performance. Results indicated that Anglo children showed greater in‐group preference and scored higher on teacher evaluations than Aboriginal children, although there was no difference on self‐concept. No correlation existed between in‐group preference and self‐concept. It was concluded that the problems faced by Aboriginal children are only likely to be alleviated by a great deal of structural change. Copyright © 2000 John Wiley & Sons, Ltd.     

Identification of Matrices in Science and Engineering

Engineering science is a scientific discipline that from the point of view of epistemology and the philosophy of science has been somewhat neglected. When engineering science was under philosophical scrutiny it often just involved the question of whether engineering is a spin-off of pure and applied science and their methods. We, however, hold that engineering is a science governed by its own epistemology, methodology and ontology. This point is systematically argued by comparing the different sciences with respect to a particular set of characterization criteria. This revised version was published online in August 2006 with corrections to the Cover Date.