Orientation tuning of shapefrom shading

Four experiments were performed to assess the effect of different orientations and direction of lighting on the visual processing of shaded or bipartite disks. In the first two experiments, observers were presented with nine different shading orientations from 0° to 180°. Targets were detected in a rapid and parallel fashion for shaded disks when the orientation of the shading gradient was not horizontal (90°) or oriented at 67.5°. Search asymmetries favoring the detection of “pock” targets over “ball” targets were found for all orientations. The search rates for bipartite disks were similar to the shaded disks at 0°, 22.5°, and 90° but not for intermediate orientations, and no search asymmetries were found. These differences suggest that shaded displays and bipartite displays are processed by different underlying mechanisms. The third experiment showed that the direction of the light source (left or right) had no influence on search asymmetries around the 90° point. Shading gradient orientation affected magnitude estimates of depth in the fourth experiment. These experiments show that the visual system’s “as-sumption” of overhead lighting is broadly tuned.     

Transcendence,transmission and transformation: the transcendent function in infant observation

Abstract: This article discusses the activation of the transcendent function as it operates through a series of complex parallel processes occurring within a Tavistock Model Infant Observation Group whose location is Palo Alto, California. We follow the observer, a seasoned female analyst, through her final two observations as she is caught initially in the central family complex that does not allow for a conscious ending to this three‐year observational period. Subsequently through the work of the transcendent function within the group, a discussion of the observer's ensuing paradoxical enactment takes place as we watch how this observer becomes able to help the family reach a termination not previously possible. Moving within a dynamic field that includes the infant observation group, the observed baby and his family, we experience the numinosity of the transformation that is activated. We will explore the ongoing encounter between the group mind, the observer and the observed as mutations within this dynamic field enable a genuine experience of mourning that has a profound effect on the observed baby and family.     

Effect of initial texture on deformation-induced grain growth in pulsed electrodeposited microcrystalline copper

Owing to the presence of large fraction of grain boundaries, deformation-induced grain growth is commonly observed in fine-grained electrodeposited metals. Here we demonstrate that microcrystalline copper (d～1–10?µm) with different textures produced by electrodeposition exhibit significant deformation-induced grain growth in tension by coalescence along with twin boundary migration and detwinning. Oriented growth with the formation of a cube texture was noted in the deformed samples. There was an increased fraction of twin boundaries with large angular deviation from Brandon's criterion during deformation.     

Psychophysical investigation of vigilance decrement in jumping spiders: overstimulation or understimulation?

The inability to maintain signal detection performance with time on task, or vigilance decrement, is widely studied in people because of its profound implications on attention-demanding tasks over sustained periods of time (e.g., air-traffic control). According to the resource depletion (overload) theory, a faster decrement is expected in tasks that are cognitively demanding or overstimulating, while the underload theory predicts steeper decrements in tasks that provide too little cognitive load, or understimulation. Using Trite planiceps, a jumping spider which is an active visual hunter, we investigated vigilance decrement to repetitive visual stimuli. Spiders were tethered in front of two stimulus presentation monitors and were given a polystyrene ball to hold. Movement of this ball indicates an attempt to turn towards a visual stimulus presented to a pair of laterally facing (anterior lateral) eyes for closer investigation with high acuity forward-facing (anterior median) eyes. Vigilance decrement is easily measured, as moving visual stimuli trigger clear optokinetic responses. We manipulated task difficulty by varying the contrast of the stimulus and the degree of ‘noise’ displayed on the screen over which the stimulus moved, thus affecting the signal:noise ratio. Additionally, we manipulated motivation by paired testing of hungry and sated spiders. All factors affected the vigilance decrement, but the key variable affecting decrement was stimulus contrast. Spiders exhibited a steeper decrement in the harder tasks, aligning with the resource depletion theory.     

Tolerating Distress After Trauma: Differential Associations Between Distress Tolerance and Posttraumatic Stress Symptoms

Distress tolerance has been implicated in disorders of emotional regulation, such as eating disorders and borderline personality disorder; however, much less attention has been given to distress tolerance in the context of posttraumatic stress (PTS). Several conceptual linkages between distress tolerance and PTS exist. Low distress tolerance may increase negative appraisals, reducing an individual’s propensity to deal with distressing mental symptoms immediately after a trauma. Relatedly, a perceived inability to cope with the distress brought on by trauma-related memories and cues may engender maladaptive coping strategies. The few published studies examining the relationship between distress tolerance and PTS have demonstrated that lower distress tolerance was associated with increased PTS symptomatology, including increased avoidance, hyperarousal, and re-experiencing. The current study sought to replicate and extend the emerging empirical base by examining the relationship between distress tolerance and the four distinct PTS symptom clusters, while controlling for time since the index trauma and depressive symptoms. Results indicated that distress tolerance accounted for significant unique variance in re-experiencing and avoidance but not negative emotionality and hyperarousal symptoms. There was also a strong positive association between the number of traumas endorsed by participants, depression, and PTS symptoms. Findings suggest that distress tolerance is associated with PTS, lending further support to the putative relationship between PTS and distress tolerance. Accordingly, developing treatment protocols designed to increase distress tolerance in individuals affected by PTS may reduce symptom severity and increase coping abilities.     

A Study of Some Factors Involved in Place Learning

Through the technique of Goodman's log linear method, longitudinal data are analyzed to clarify the relationship between depressive mood and illicit drug use among youths. A representative sample of adolescents (N = 8206) from New York State secondary schools was followed over one academic year. At one point in time, users of illicit drugs other than marihuana (multiple drug users) were significantly more depressed than either nonusers or users of marihuana only. Differing interactive relationships were found over time depending upon the drugs involved. Depressive mood was related to the onset of marihuana use among nonusers and to the termination of marihuana use among users. Depressive mood also predicted the use of other illicit drugs by marihuana users. While the beginning use of illicit drugs other than marihuana was positively associated with increased depressive mood, continued multiple drug use was related to reduced depressive mood.     

Explanatory models for mental illness endorsed by Christian clergymen: The development and use of an instrument in Singapore

Researchers have attempted to elicit the explanatory models used by different populations to understand mental illness, since these models can influence how populations use mental-health treatment. However, little effort has been made to understand the explanatory models used by Christian clergymen. This is despite their important role as providers of mental-health care in many Asian and Western societies. Neither are there suitable instruments to conduct such investigations. This study attempts to present a suitable instrument for such research and explore the belief structure of this population by administering a modified version of the Opinions about Psychological Problems to a representative sample of Singaporean Christian clergymen. Factor-analytic techniques revealed five factors which were explained as (1) a Traditional Christian and (2) a Deliverance etiology, both models implicating religious causes for mental illness, (3) a Poor Coping and (4) Internal Conflicts etiology, essentially being psychological explanations and an (5) Organic etiology model. The Traditional Christian model received the greatest endorsement, followed by the Poor Coping model, while the Organic model had the least acceptance. The belief structure used by nearly half of the respondents was noted to be complex, involving a combination of religious, psychological, and organic explanations.