Visually perceived eye level: changes induced by a pitched-from-vertical 2-line visual field.

The physical elevation corresponding to visually perceived eye level (VPEL) changes linearly with the pitch of a visual field. Deviations from true eye level average more than 0.5 times the angle of pitch over a 65 degrees pitch range. A visual field consisting of 2 dim, isolated vertical lines in darkness is more than 4/5 as effective as that of a complexly structured visual field; 2 horizontal lines have a small and inconsistent effect. Differences in influence on VPEL between pitched-from-vertical and horizontal lines were predicted from an analysis that extracted differences in retinal perspective resulting from changes in pitch. The Great Circle Model (GCM), based on a spherical approximation to the erect, stationary eye, predicts the present results and results of 8 other sets of experiments. The model treats the influence of a single line on VPEL as systematically related to the elevation of the intersection between the great circle containing the image of the line and the central vertical retinal meridian; generalized GCM combines visual inputs with inputs from the body-referenced mechanism and maps onto the central nervous system.     

Visual perception of direction when voluntary saccades occur: II. Relation of visual direction of a fixation target extinguished before a saccade to a subsequent test flash presented before the saccade

Previously reported experiments demonstrated changes in the relation of visual direction to retinal locus for stimulation during voluntary saccades as compared to this relation before saccade initiation. The quantitative features of these results led to the prediction, confirmed in the present experiments, that there are shifts in visual direction for stimulation presented before the saccade itself. In the present report, monotonically increasing shifts were mapped with stimuli presented as early as 240 msec before the saccade up to the saccade itself. Such shifts cannot be accounted for readily by “inflowing” processes, and while “outflowing” processes seem to be implicated, their quantitative characteristics would need to be considerably different from those required by classical outflow theories.     

Variation of the magnitude of the horizontal-vertical illusion with retinal eccentricity

The horizontal-vertical illusion was studied as a function of retinal eccentricity. It was found that the relation of illusion magnitude to vertical eccentricity is described by a U-shaped function with large amounts of reversed illusion for the more eccentric positions. Substantial effects due to horizontal eccentricity were also obtained, but these were not consistent across subjects. It is suggested that the flattening of the peripheral zones of the refracting surfaces of the eye may be involved in the variation of the illusion with retinal position, and that the astigmatic properties of the central portions of these surfaces may be a prime factor in the usual horizontal-vertical illusion.     

Differences in influence between pitched-from-vertical lines and slanted-from-frontal horizontal lines on egocentric localization

The visual field exerts powerful effects on egocentric spatial localization along both horizontal and vertical dimensions. Thus, (1) prism-produced visual pitch and visual slant generate similar mislocalizations of visually perceived eye level (VPEL) and visually perceived straight ahead (VPSA) and (2) in darkness curare-produced extraocular muscle paresis under eccentric gaze generates similar mislocalizations in VPEL and VPSA that are essentially eliminated by introducing a normal visual field. In the present experiments, however, a search for influences of real visual slant on VPSA to correspond to the influences of visual pitch on VPEL failed to find one. Although the elevation corresponding to VPEL changes linearly with the pitch of a visual field consisting of two isolated 66.5°-long pitched-from-vertical lines, the corresponding manipulation of change in the slant of either a horizontal two-line or a horizontal four-line visual field on VPSA did not occur. The average slope of the VPEL-versus-pitch function across 5 subjects was +0.40 over a ±30° pitch range, but was indistinguishable from 0.00 for the VPSA-versus-slant function over a ±30° slant range. Possible contributions to the difference between susceptibility of VPEL and VPSA to visual influence from extraretinal eye position information, gravity, and several retinal gradients are discussed.     

Conditioned tilt naming: A modified absolute judgment method is used to measure the oblique effect

Two naive human observers were conditioned to report on the slant of a 3.8-cpd sinusoidal grating viewed monocularly with a light-adapted eye and presented at various orientations extending from ?45 to +135 deg. The procedures used yielded a baseline measure of performance and measures obtained during conditioning, extinction, and reconditioning of the tilt-naming response. Both subjects learned rapidly, achieving a level of performance that permits efficient measurement of meridional differences in perceived orientation Ithe oblique effect) at a large number of angles.     

Evolution of behavior and the comparative method

The comparative method, that is, the discrimination of similarities and differences in the physical and social aspects of the environment, requires the concept of levels of integration and organization to be useful in the study of the evolution and development of behavior. Comparative studies based on the quasi-scientific theories of the inheritance of behavior and the predominance of genetic processes as causal in evolution and development of all species, including people, — Lorenzian ethology, Wilsonian sociobiology —overlook significant differences among species and reduce quantitative and qualitative differences in behavior to a unitary causal mechanism, which is not sufficient to explain complex behavior. Further, such theories oversimplify genetic processes and their relation to behavior. The comparative method is applicable and useful when the questions to be answered are based on stated assumptions which are testable and when the levels of the phenomena being compared are equivalent.     

Reliability,validity, and prevalence of partner violence measured by the conflict tactics scales in male-dominant nations

This article evaluates whether use of the Conflict Tactics Scales (CTS) with women in male-dominant nations results in reliable and valid data. Tabulation of ten published studies in male-dominant nations found a median alpha coefficient of reliability of .86. For university students in the 32 nation International Dating Violence Study, the median alpha for women is .82 and .78 for males. Similar alpha coefficients were found regardless of the national level of male-dominance. Validity was measured by estimating the sensitivity of the CTS in eliciting data on perpetration of physical assault, by evaluating the degree to which assaults reported by the women were acts of self-defense, and by construct validity analyses to test the hypothesis that being a victim of physical assault as measured by the CTS is associated with physical injury, depressive symptoms, and post-traumatic stress symptoms. The hypothesized relationships were found regardless of the degree of male dominance in a nation. The results support continued use of the CTS to investigate PV in the lives of women worldwide. The discussion suggests that the effort to combat violence against women could be enhanced by using the full CTS to provide data on perpetration by women as well as victimization of women.     

Emotional intelligence and personal growth initiative effects on subjective happiness among university students

This study examined emotional intelligence and personal growth initiative influences on the level of subjective happiness among university students in Ghana. Two hundred and sixty undergraduate students were participants (female = 69.8%; mean age = 21.72 years, SD = 3.61 years). They responded to measures of emotional intelligence, personal growth initiative, and subjective happiness. After controlling for their demographic characteristics, and following hierarchical regression analysis, results indicate emotional intelligence and intentional behaviour domain of personal growth to predict students’ level of subjective happiness. These findings suggest that students’ ability to manage and utilise their emotions, as well as their personal growth initiative contribute significantly to their level of happiness.     

child pornography and the internet: perpetuating a cycle of abuse

Thirteen men convicted of downloading child pornography were interviewed with a view to understanding how these men talked about the photographs and the function such talk played in their accounts. The interviews were informed by earlier work with defended subjects and were analyzed within a discursive framework. Quotations are used from the interviews to illustrate the analysis. Six principal discourses emerged within these accounts in relation to child pornography: sexual arousal; as collectibles; facilitating social relationships; as a way of avoiding real life; as therapy; and in relation to the Internet. These are discussed in the context of previous research. The analysis illustrates the important role that the Internet plays in increasing sexual arousal to child pornography and highlights individual differences in whether this serves as a substitute or as a blueprint for contact offenses. It also draws our attention to the important role that community plays in the Internet and how collecting facilitates the objectification of children and increases the likelihood that in the quest for new images children continue to be sexually abused. Discourses focussing on both therapy and addiction serve to distance the respondent from personal agency and allow for continued engagement with child pornography.     

A second-order factor analysis of reasoning abilities

This article reports a second-order factor analysis of the 13 interpretable first-order factors of Adkins and Lyerly based on 66 variables for 200 Army men. The approach to simple structure for 6 second-order factors was unusually good. Loadings of the original 66 variables on the second-order factors were also obtained. Five of the factors are tentatively interpreted as Precision in Formation and Use of Verbal Concepts, General Verbal Fluency, Visualizing Spatial Constancy During Movement, Speed in Analysis, and Flexibility in Analysis.