Binocular vision enhances phase discrimination by filtering the background

Previous studies have shown that the detectability of a noise-masked target can be enhanced under stereoscopic viewing when the target’s interocular disparity differs from that of the noise. This enhanced detectability can be accounted for by a model postulating that the binocular system linearly sums the left-eye and right-eye views of a visual scene. This model also predicts enhanced phase discrimination under specifiable interocular disparities of target and noise. Two experiments were conducted in which subjects were asked to discriminate between two luminance patterns (target and foil) that differed only in phase. The target patterns were constructed by summating two vertical sinusoidal gratings in which the phase difference between the higher and the lower spatial frequency gratings was 45°. The foils contained the same two component frequencies, with a phase difference of ?45°. Thus, targets and foils were mirror images of one another. The ability of subjects to Discriminate between these stereoscopically viewed mirror-image patterns was investigated under two sets of interocular disparities: those that, according to our model, would unmask one or both spatial frequency components, and those that would leave both components masked by the noise. Phase discrimination was enhanced only when both component frequencies of the target and foil were unmasked. The implications of these findings for template-matching and phase-discrimination models of pattern discrimination are considered.     

Compulsive and addictive sexual disorders and the family

In the treatment of sexual addiction and compulsivity, the family unit is often neglected. Yet this disorder has a major impact not only on the identified patient, but also on the spouse or partner (the coaddict) and on the family as a whole. Moreover, the family unit is the context in which the sexual addict continues to live, and the mental health of the partner has a significant impact on the sexual addict's recovery. Increasing evidence points to a family history of addiction or dysfunction as a primary contributor to both sexual addiction and coaddiction in adulthood. When compulsive sexual behaviors are present within a family, treatment of both members of the couple improves the couple's relationship as well as the mental health of each partner. In addition, treatment of children in such a family can help break the cycle of sexual addiction and prevent its perpetuation into the next generation.     

Adaptive Dynamics of the Leg Movement Patterns of Human Infants: II. Treadmill stepping in Infants and Adults

Infant treadmill steps have many temporal and kinematic similarities to adult walking. Kinematic similarities can result from different patterns of underlying torque, however. In this study, we used inverse dynamics to compare the patterns and contributions of active (muscle) and passive (gravity and motion-dependent) torques in the swing phase of treadmill stepping in 7-month-old infants and adults. Results indicated that adults consistently used muscle torque to initiate and terminate swing, but that passive torques accounted for leg motion during most of the swing phase. Infants, in contrast, displayed multiple patterns of torque contributions during swing. In the most frequently occurring infant pattern, muscle torque remained flexor throughout swing and joint reversals were due to the dominant passive gravitational torque. The kinetic data suggest that the temporally and kinematically similar treadmill steps produced by adults and infants do not emanate from a unique set of neural commands to the muscles, but from a flexible interplay between multiple internal as well as external elements. These data suggest that the intrinsic dynamics of the human system provide a medium out of which, given a supportive context, stable patterns can emerge spontaneously. During development, voluntary controlled movement patterns must build on these intrinsic dynamics.     

Effects of victim gender and physical vs. psychological trauma/injury on observers' perceptions of sexual assault and its aftereffects

Researchers have examined many underlying attitudes toward rape. Studies have focused on female victims while an increasing number of reported male rape victims has been overlooked. This study compared observers' attribution of guilt toward rape victims and their rapists. It also specified the trauma inflicted by either physical or psychological concomitants of rape victimization and compared the effect of such information on both blame and expectation of recovery. Participants were university students, primarily Caucasian, with mean ages 20.56 and 21.21 years for males and females, respectively. Female victims were judged more harshly than male victims. Length of imprisonment considered appropriate for guilty assailants was found to be greater when injury was done to one's own gender. Recovery was expected to be a lengthy process. Implications for social gender stereotyping and public attitudes concerning aftereffects of traumatic stress are discussed.

     

Does stimulus context affect loudness or only loudness judgments?

Marks (1988) reported that when equal-loudness matches were inferred from magnitude estimates of loudness for tones of two different frequencies, the matches were affected by changes in the stimulus intensity range at both frequencies. Marks interpreted these results as reflecting the operation of response biases in the subjects' estimates; that is, the effect of range was to alter subjects' judgments but not necessarily the perception of loudness itself. We investigated this effect by having subjects choose which of two tone pairs defined the larger loudness interval. By using tones of two frequencies, and varying their respective intensity ranges, we reproduced Marks' result in a procedure devoid of numerical responses. When the tones at one frequency are all soft, but the tones at the other frequency are not all soft, cross-frequency loudness matches are different from those obtained with other intensity range combinations. This suggests that stimulus range affects the perception of loudness in addition to whatever effects it may have on numerical judgments of loudness.     

Correctly responding to reasons while being means-end incoherent

This paper argues that Reason Responsiveness (RR) accounts of rationality, proposed for example by Benjamin Kiesewetter and Error Lord, fail to explain structural irrationality (i.e., the irrationality involved in holding incoherent attitudes). Proponents of RR hold that rationality consists in correctly responding to available reasons. Structural irrationality, they argue, is just a “by-product” of incorrect reason-responding. Applying this idea to cases of means–end incoherence, this paper shows that RR accounts must rely on a certain transmission principle. Roughly, this amounts to the principle that necessarily, if (1) A has decisive available reason to intend to E and (2) A has decisive available reason to believe that intending to M is necessary for E-ing, it follows that (3) A has decisive available reason to intend to M. By considering an example, this paper argues that even the most plausible version of this transmission principle does not hold true. It follows that one can correctly respond to one's available reasons while being means–end incoherent.     

The role of neuroticism on psychological and physiological stress responses

This study examined the influence of personality on stressor appraisals and emotional, physiological, and behavioral responses to psychosocial stress. Appraisals were used to classify participants as threatened (they believed their coping resources were inadequate relative to stressor demands) or challenged (they believed their coping resources were commensurate with stressor demands). Neuroticism predicted threat appraisals, and both were related to negative emotional experience and poor task performance. The influence of neuroticism on negative emotions and poor performance was mediated by threat appraisals. High neuroticism confers stress vulnerability, but only when conditions are construed as threatening.     

An Approach to Teaching Ethics Courses in Human Services and Counseling

This article presents multiple facets of a team approach to teaching and facilitating an ethics course for undergraduate human services students and a graduate ethics course for students majoring in counseling. Starting with general points, this article describes a specific, week‐to‐week approach to a 1‐semester course, concluding with sample student evaluative comments and an experienced professor/author's processing of the experience of preparing and teaching this course for many years.     

Distinctions Among Stigmatized Groups1

This research investigated how individuals classify and distinguish among stigmatized groups. In Study 1, participants sorted 54 stigmas based on perceived similarity and then provided evaluations. Cluster analysis revealed 7 stigma clusters, including physical disability, mental disability, economically disadvantaged, social deviants, physical appearance, sexual identity, and racial identity. Multidimensional scaling showed that the stigmas differed on dimensions of social undesirability, controllability, and general pity. In Study 2, participants provided evaluation ratings of stigmas across 6 situations. Results confirmed the validity of the 7‐cluster solution.