Hierarchical motion organization in random dot configurations

Motion organization has 2 aspects: the extraction of a (moving) frame of reference and the hierarchical organization of moving elements within the reference frame. Using a discrimination of relative motions task, the authors found large differences between different types of motion (translation, divergence, and rotation) in the degree to which each can serve as a moving frame of reference. Translation and divergence are superior to rotation. There are, however, situations in which rotation can serve as a reference frame. This is due to the presence of a second factor, structural invariants (SIs). SIs are spatial relationships persisting among the elements within a configuration such as a collinearity among points or one point coinciding with the center of rotation for another (invariant radius). The combined effect of these 2 factors--motion type and SIs-influences perceptual motion organization.     

Tool use affects perceived distance, but only when you intend to use it

Recent research demonstrates neurologic and behavioral differences in people's responses to the space that is within and beyond reach. The present studies demonstrated a perceptual difference as well. Reachability was manipulated by having participants reach with and without a tool. Across 2 conditions, in which participants either held a tool or not, targets were presented at the same distances. Perceived distances to targets within reach holding the tool were compressed compared with targets that were beyond reach without it. These results suggest that reachability serves as a metric for perception. The 3rd experiment found that reachability only influenced perceived distance when the perceiver intended to reach. These experiments suggest that the authors perceive the environment in terms of our intentions and abilities to act within it.     

Distances appear different on hills

When walking effort is increased due to manipulations such as wearing heavy backpacks, people perceive hills to be steeper and distances to be farther (Bhalla & Proffitt, 1999; Proffitt, Stefanucci, Banton, & Epstein, 2003). On the basis of these findings, we expected people to overestimate distances on steep hills relative to the same distances on flat ground, because of the increased effort required to ascend or descend them. This hypothesis is in contrast to the belief that distances are specified solely by optical and oculomotor information related to the geometry of the environment. To test the hypothesis, we investigated distance estimation on hills and flat terrains in natural and virtual environments. We found that participants judged steep uphill and downhill distances to be farther than the same distances on flat terrain. These results are inconsistent with the idea that spatial layout is perceived solely in terms of geometry, lending partial support to an effort hypothesis.     

Seeing big things: overestimation of heights is greater for real objects than for objects in pictures

In six experiments we demonstrate that the vertical-horizontal illusion that is evoked when viewing photographs and line drawings is relatively small, whereas the magnitude of this illusion when large objects are viewed is at least twice as great. Furthermore, we show that the illusion is due more to vertical overestimation than horizontal underestimation. The lack of a difference in vertical overestimation between pictures and line drawings suggests that vertical overestimation in pictures depends solely on the perceived physical size of the projection on the picture surface, rather than on what is apparent about an object's represented size. The vertical-horizontal illusion is influenced by perceived physical size. It is greater when viewing large objects than small pictures of these same objects, even when visual angles are equated.     

Visual-motor recalibration in geographical slant perception.

In 4 experiments, it was shown that hills appear steeper to people who are encumbered by wearing a heavy backpack (Experiment 1), are fatigued (Experiment 2), are of low physical fitness (Experiment 3), or are elderly and/or in declining health (Experiment 4). Visually guided actions are unaffected by these manipulations of physiological potential. Although dissociable, the awareness and action systems were also shown to be interconnected. Recalibration of the transformation relating awareness and actions was found to occur over long-term changes in physiological potential (fitness level, age, and health) but not with transitory changes (fatigue and load). Findings are discussed in terms of a time-dependent coordination between the separate systems that control explicit visual awareness and visually guided action.     

Seeing mountains in mole hills: geographical-slant perception

When observers face directly toward the incline of a hill, their awareness of the slant of the hill is greatly overestimated, but motoric estimates are much more accurate. The present study examined whether similar results would be found when observers were allowed to view the side of a hill. Observers viewed the cross-sections of hills in real (Experiment 1) and virtual (Experiment 2) environments and estimated the inclines with verbal estimates, by adjusting the cross-section of a disk, and by adjusting a board with their unseen hand to match the inclines. We found that the results for cross-section viewing replicated those found when observers directly face the incline. Even though the angles of hills are directly evident when viewed from the side, slant perceptions are still grossly overestimated.     

Judeo-Christian Clergy and Personal Crisis: Religion,Posttraumatic Growth and Well Being

This study investigated the psychological impact of personal traumatic events in a sample of 30 Judeo-Christian clergy. Use of religion-based coping strategies following a difficult life event was expected to facilitate posttraumatic growth, and posttraumatic growth was, in turn, expected to result in greater current well being. Both predictions were supported. In addition, higher levels of rumination soon after the event were associated with greater posttraumatic growth. The results indicated that clergy benefited from both positive and negative styles of religious coping, and that posttraumatic growth was not associated with greater well being for this sample. Deborah Proffitt, M.A., is in private practice in Charlotte, North Carolina. Arnie Cann, Ph.D., is a Professor in the Psychology Department at the University of North Carolina Charlotte. A social psychologist, he is involved in research on posttraumatic growth and interpersonal relationships. Lawrence G. Calhoun, Ph.D., is a Professor in the Psychology Department at the University of North Carolina Charlotte. A clinical psychologist, he has studied posttraumatic growth and responses to crises. Richard G. Tedeschi, Ph.D., is a Professor in the Psychology Department at the University of North Carolina Charlotte. A clinical psychologist, he has studied posttraumatic growth and bereavement issues.     

Referrers' Perceived Utility and Outcomes of Clinical Neuropsychological Assessment in an Adolescent and Young Adult Public Mental Health Service

Despite frequent informal or anecdotal acknowledgement of the usefulness of neuropsychological services within various settings, including mental health settings, few studies have formally investigated the satisfaction, perceived utility, or outcomes associated with such a service. This survey‐based study evaluated referring clinicians’ (n = 35) perceptions of the usefulness and outcomes associated with the provision of clinical neuropsychological assessment and feedback within an adolescent and young adult public mental health service in Melbourne, Australia. The results suggest that referrers perceive the neuropsychological service, including formal neuropsychological assessment report and verbal and written feedbacks, as a highly useful adjunct to their clinical practice. In addition, referrers frequently reported clinically meaningful outcomes in association with the neuropsychological service, including diagnostic changes or additions (11% of clients referred), changes to approaches in treatment (52% of clients referred), and increased or appropriate access to services, education, or work (33% of clients referred). Referrers also reported that almost 60% of neuropsychological assessment reports were forwarded to other services or clinicians involved in the client's care. The findings suggest that mental health settings are likely to benefit from routine inclusion of specialist neuropsychology services. However, future research should also examine client and family perceptions regarding the satisfaction and usefulness of neuropsychological services.