Spatial suppression promotes rapid figure-ground segmentation of moving objects.

Segregation of objects from their backgrounds is a fundamental visual function and one that is particularly effective when objects are in motion. Theoretically, suppressive center-surround mechanisms are well suited for accomplishing motion segregation. This longstanding hypothesis, however, has received limited empirical support.

Persistent Biases in Binocular Rivalry Dynamics within the Visual Field.

Binocular rivalry is an important tool for measuring sensory eye dominance-the relative strength of sensory processing in an individual's left and right eye. By dichoptically presenting images that lack corresponding visual features, one can induce perceptual alternations and measure the relative visibility of each eye's image. Previous results indicate that observers demonstrate reliable preferences for several image features, and that these biases vary within the visual field.

Perceptual training profoundly alters binocular rivalry through both sensory and attentional enhancements.

The effects of attention, as well as its functional utility, are particularly prominent when selecting among multiple stimuli that compete for processing resources. However, existing studies have found that binocular rivalry-a phenomenon characterized by perceptual competition between incompatible stimuli presented to the two eyes-is only modestly influenced by selective attention. Here, we demonstrate that the relative resistance of binocular rivalry to selective modulations gradually erodes over the course of extended perceptual training that uses a demanding, feature-based attentional task.

Individual differences in sensory eye dominance reflected in the dynamics of binocular rivalry.

Normal binocular vision emerges from the combination of neural signals arising within separate monocular pathways. It is natural to wonder whether both eyes contribute equally to the unified cyclopean impression we ordinarily experience. Binocular rivalry, which occurs when the inputs to the two eyes are markedly different, affords a useful means for quantifying the balance of influence exerted by the eyes (called sensory eye dominance, SED) and for relating that degree of balance to other aspects of binocular visual function.

Does visual attention drive the dynamics of bistable perception?

How does attention interact with incoming sensory information to determine what we perceive? One domain in which this question has received serious consideration is that of bistable perception: a captivating class of phenomena that involves fluctuating visual experience in the face of physically unchanging sensory input. Here, some investigations have yielded support for the idea that attention alone determines what is seen, while others have implicated entirely attention-independent processes in driving alternations during bistable perception. We review the body of literature addressing this divide and conclude that in fact both sides are correct-depending on the form of bistable perception being considered.

Motion-induced blindness continues outside visual awareness and without attention.

Visual phenomena demonstrating striking perceptual disappearances of salient stimuli have fascinated researchers because of their utility in identifying neural processes that underlie subjective visibility and invisibility. Motion-induced blindness (MIB) is appealing for such purposes because it, like a class of ostensibly related paradigms such as binocular rivalry, features periods of unequivocal subjective disappearances despite constant physical stimulation. It remains unclear, however, exactly how the mechanisms that cause MIB are related to subjectively observed fluctuations in visual awareness.

The role of sensory ocular dominance on through-focus visual performance in monovision presbyopia corrections.

Monovision presbyopia interventions exploit the binocular nature of the visual system by independently manipulating the optical properties of the two eyes. It is unclear, however, how individual variations in ocular dominance affect visual function in monovision corrections. Here, we examined the impact of sensory ocular dominance on visual performance in both traditional and modified monovision presbyopic corrections.

When can attention influence binocular rivalry?

Attentional influence over perception is particularly pronounced when sensory stimulation is ambiguous, where attention can reduce stimulus uncertainty and promote a stable interpretation of the world. However, binocular rivalry, an extensively studied visual ambiguity, has proved to be comparatively resistant to attentional modulation. We hypothesize that this apparent inconsistency reflects fluctuations in the degree of unresolved competition during binocular rivalry.

Kinesthesis can make an invisible hand visible.

Self-generated body movements have reliable visual consequences. This predictive association between vision and action likely underlies modulatory effects of action on visual processing. However, it is unknown whether actions can have generative effects on visual perception.

Assessing the financial impact of an inpatient acute palliative care unit in a tertiary care teaching hospital.

Background: Evidence suggests palliative care consult services yield cost improvements; few studies have examined the impact of an inpatient palliative care unit on hospital costs.

Objective: This study estimates the cost avoidance of a single hospital's acute palliative care unit (APCU), building upon previous studies (1) by limiting pre-APCU costs to two days pre-APCU transfer, thereby minimizing bias from higher-cost first days of admission, and (2) by not limiting the study to cancer patients or patients who died, thereby presenting more comprehensive APCU costs.

Design: This retrospective study compares direct costs of care on an APCU with costs pre-APCU transfer from general medical units, intensive care units (ICU), and the emergency department (ED), and compares the direct costs of APCU patients with those of control patients.

Understanding attentional modulation of binocular rivalry: a framework based on biased competition.

Starting from early scientific explorations of binocular rivalry, researchers have wondered about the degree to which an observer can exert voluntary attentional control over rivalry dynamics. The answer to this question would not only reveal the extent to which we may determine our own conscious visual experience, but also advance our understanding of the neural mechanisms underlying binocular rivalry. Classic studies, intriguingly, reached contradictory conclusions, ranging from an absence of attentional control, as advocated by Breese, to nearly complete control of rivalry dynamics, as reported by Helmholtz.

A 4-year integrated curriculum in palliative care for medical undergraduates.

In order to graduate physicians prepared to effectively address clinical issues in palliative medicine and to comply with LCME requirements, the Northeastern Ohio Universities Colleges of Medicine and Pharmacy (NEOUCOM) integrated a coordinated four-year palliative care (PC) curriculum. This report describes the development of the longitudinal curriculum and provides helpful resources and strategies to guide clinicians and administrators undertaking similar efforts. This is a retrospective, descriptive report based on data collected throughout development of the new curriculum.