Beyond artificial, sex-linked distinctions to conceptualize female sexuality: comment on Baumeister (2000)

The authors comment on three aspects of R. F. Baumeister's (2000) theoretical article on female sexuality. Questioning the predominance of nature versus cultural factors in accounting for sexual outcomes for men and women, the authors draw attention to the similarities (as opposed to differences) in the sexual attitudes, behaviors, and responses of men and women, and directly question the suggestion of "controlling" women's sexual attitudes, behaviors, responses, etc. to meet social needs for change.     

Assessing stress in cancer patients: a second-order factor analysis model for the Perceived Stress Scale

Using the Perceived Stress Scale (PSS), perceptions of global stress were assessed in 111 women following breast cancer surgery and at 12 and 24 months later This is the first study to factor analyze the PSS. The PSS data were factor analyzed each time using exploratory factor analysis with oblique direct quartimin rotation. Goodness-of-fit indices (root mean square error of approximation [RMSEA]), magnitude and pattern of factor loadings, and confidence interval data revealed a two-factor solution of positive versus negative stress items. The findings, replicated across time, also indicate factor stability. Hierarchical factor analyses supported a second-order factor of "perceived stress." This alternative factor model of the PSS is presented along with observations regarding the measure's use in cancer research.     

The discrimination of heading from optic flow is not retinally invariant

Three experiments were conducted to determine whether the discrimination of heading from optic flow is retinally invariant and to determine the importance of acuity in accounting for heading eccentricity effects. In the first experiment, observers were presented with radial flow fields simulating forward translation through a three-dimensional volume of dots. The flow fields subtended 10° of visual angle and were presented at 0°, 10°, 20°, and 40° of retinal eccentricity. The observers were asked to indicate whether the simulated movement was to the right or the left of a target that appeared at the end of the display sequence. Eye movements were monitored with an electrooculogram apparatus. In a second experiment, static acuity thresholds were derived for each of the observers at the same retinal eccentricities. There was a significant increase in heading detection thresholds with retinal eccentricity (from 0.92° at 0° retinal eccentricity to 3.47° at 40°). An analysis of covariance indicated that the variation in sensitivity to radial flow, as a function of retinal eccentricity, is independent of acuity. Similar results were obtained when the Vernier acuity of observers was measured. These results suggest that the discrimination of heading from radial flow is not retinally invariant.     

Sex-role typing as related to acceptance of self, acceptance of others, and discriminatory attitudes toward women

This study examines four hypotheses relating sex-role typing to self-acceptance, acceptance of others, and sexist attitudes toward women. University students completed the Bem Sex-Role Inventory, the Berger Self-Acceptance Scale, and the Macho Scale. Findings showed more self-acceptance than acceptance of others among masculine-typed subjects and more acceptance of others than self-acceptance among feminine-typed subjects. Feminine-typed males and masculine-type females showed least self-acceptance among the six groups, while androgynous subjects showed highest self-acceptance. Masculine-typed males were least accepting of others and scored highest in discriminatory attitudes toward women. Male subjects showed greater variability than did female subjects on all scales, and Bem's measure of sex-role typing proved a more efficient moderator of scores of males than of those of females. Additional personality and behavioral research with sex-role typing variables is proposed.     

Estimating the parameters of the latent population distribution

Under consideration is a test battery of binary items. The responses ofn individuals are assumed to follow a Rasch model. It is further assumed that the latent individual parameters are distributed within a given population in accordance with a normal distribution. Methods are then considered for estimating the mean and variance of this latent population distribution. Also considered are methods for checking whether a normal population distribution fits the data. The developed methods are applied to data from an achievement test and from an attitude test.     

Detection of three-dimensional surfaces from optic flow: The effects of noise

Previous research (Andersen, 1989) has suggested that the recovery of 3-D shape from nonsmooth optic flow (motion transparency) can be performed by segregating surfaces according to the distributions of velocities present in the flow field. Five experiments were conducted to examine this hypothesis in a surface detection paradigm and to determine the limitations of human observers to detect 3-D surfaces in the presence of noise. Two display types were examined: a flow field that simulateda surface corrugated in depth and a flow field-that simulated a random volume. In addition, two types of noise were examined: a distribution of noise velocities that overlapped or did not overlap the velocity distribution that defined the -surface. Corrugation frequency and surface density were also examined. Detection performance increased with decreasing corrugation frequency, decreasing noise density, and decreasing surface density. Overall, the subjects demonstrated remarkable tolerance to the presence of noise and, for some conditions, could discriminate surface from random conditions when noise density was twice the-surface density. Discrimination accuracy was greater for the nonoverlapping than for the overlapping noise, providing support for an analysis based on the distribution of velocities.     

Interaction between theory and practice in the surgical treatment of ulcer disease in the period of 1880–1920

Newly developed techniques for anaesthesia and asepsis made it possible for surgeons to attempt operative attacks on diseases which had been previously incurable. The period around the turn of the century is sometimes portrayed as one of very active development of new surgical methods. This activity has been seen as a result of fertile scientific thinking. It is demonstrated in the paper that it was in fact a barren period with a prolonged adherence to an anatomical concept as the basis for problem solving. It is described in terms of Kuhnian periods of normal activity and crisis. It took about fifty years before theory and practice were harmonized under a physiological concept and real progress was made.     

Perceived internal depth in rotating and translating objects

Previous research has indicated that observers use differences between velocities and ratios of velocities to judge the depth within a moving object, although depth cannot in general be determined from these quantities. In four experiments we examined the relative effects of velocity difference and velocity ratio on judged depth within a transparent object that was rotating about a vertical axis and translating horizontally, examined the effects of the velocity difference for pure rotations and pure translations, and examined the effect of the velocity difference for objects that varied in simulated internal depth. Both the velocity difference and the velocity ratio affected judged depth, with difference having the larger effect. The effect of velocity difference was greater for pure rotations than for pure translations. Simulated depth did not affect judged depth unless there was a corresponding change in the projected width of the object. Observers appear to use the velocity difference, the velocity ratio, and the projected width of the object heuristically to judge internal object depth, rather than using image information from which relative depth could potentially be recovered.