Parallel processing in visual search asymmetry

The difficulty of visual search may depend on assignment of the same visual elements as targets and distractors-search asymmetry. Easy C-in-O searches and difficult O-in-C searches are often associated with parallel and serial search, respectively. Here, the time course of visual search was measured for both tasks with speed-accuracy methods. The time courses of the 2 tasks were similar and independent of display size. New probabilistic parallel and serial search models and sophisticated-guessing variants made predictions about time course and accuracy of visual search. The probabilistic parallel model provided an excellent account of the data, but the serial model did not. Asymptotic search accuracies and display size effects were consistent with a signal-detection analysis, with lower variance encoding of Cs than Os. In the absence of eye movements, asymmetric visual search, long considered an example of serial deployment of covert attention, is qualitatively and quantitatively consistent with parallel search processes.     

The DRD4 VNTR polymorphism influences reactivity to smoking cues

Recent research has indicated that craving for tobacco can be reliably elicited by exposure to smoking cues, suggesting that cue-elicited craving for tobacco may be a useful phenotype for research on genetic factors related to nicotine dependence. Given the potential role of dopamine in cue-elicited craving, the authors examined whether the DRD4 VNTR polymorphism is associated with cue-elicited craving for tobacco. Participants who were homozygous or heterozygous for the 7 repeat (or longer) allele were classified as DRD4 L, and all other participants were classified as DRD4 S. Participants were exposed to smoking cues before smoking either high-nicotine cigarettes or control cigarettes. Analyses suggested that participants in the L group demonstrated significantly greater craving, more arousal, less positive affect, and more attention to the smoking cues than did the participants in the S group.     

Tangible pictures: viewpoint effects and linear perspective in visually impaired people

Perception of raised-line pictures in blindfolded-sighted, congenitally blind, late-blind, and low-vision subjects was studied in a series of experiments. The major aim of the study was to examine the value of perspective drawings for haptic pictures and visually impaired individuals. In experiment 1, subjects felt two wooden boards joined at 45 degrees, 90 degrees, or 135 degrees, and were instructed to pick the correct perspective drawing from among four choices. The first experiment on perspective found a significant effect of visual status, with much higher performance by the low-vision subjects. Mean performance for the congenitally blind subjects was not significantly different from that of the late-blind and blindfolded-sighted subjects. In a further experiment, blindfolded subjects drew tangible pictures of three-dimensional (3-D) geometric solids, and then engaged in a matching task. Counter to expectations, performance was not impaired for the 3-D drawings as compared with the frontal viewpoints. Subjects were also especially fast and more accurate when matching top views. Experiment 5 showed that top views were easiest for all of the visually impaired subjects, including those who were congenitally blind. Experiment 5 yielded higher performance for 3-D than frontal viewpoints. The results of all of the experiments were consistent with the idea that visual experience is not necessary for understanding perspective drawings of geometrical objects.     

Perception of self-tilt in a true and illusory vertical plane

A tilted furnished room can induce strong visual reorientation illusions in stationary subjects. Supine subjects may perceive themselves upright when the room is tilted 90 degrees so that the visual polarity axis is kept aligned with the subject. This 'upright illusion' was used to induce roll tilt in a truly horizontal, but perceptually vertical, plane. A semistatic tilt profile was applied, in which the tilt angle gradually changed from 0 degrees to 90 degrees, and vice versa. This method produced larger illusory self-tilt than usually found with static tilt of a visual scene. Ten subjects indicated self-tilt by setting a tactile rod to perceived vertical. Six of them experienced the upright illusion and indicated illusory self-tilt with an average gain of about 0.5. This value is smaller than with true self-tilt (0.8), but comparable to the gain of visually induced self-tilt in erect subjects. Apparently, the contribution of nonvisual cues to gravity was independent of the subject's orientation to gravity itself. It therefore seems that the gain of visually induced self-tilt is smaller because of lacking, rather than conflicting, nonvisual cues. A vector analysis is used to discuss the results in terms of relative sensory weightings.     

Predicting premature termination from counseling using the Butcher Treatment Planning Inventory

This investigation examined the extent to which premature termination from counseling could be predicted from selected scales on the Butcher Treatment Planning Inventory (BTPI). Ninety-five new clients at a university counseling center agreed to participate in the study and completed the BTPI as part of the intake evaluation. Premature termination occurred when a participant missed a scheduled appointment and unilaterally dropped out of counseling. Higher scores on Closed-Mindedness, Problems in Relationship Formation, Somatization of Conflict, Self-Oriented/Narcissism, Perceived Lack of Environmental Support, and the Treatment Difficulty Composite were associated with premature termination. The General Pathology Composite, a general index of symptomatic distress, also enhanced the prediction of premature termination by suppressing irrelevant variance in other BTPI scales. The results provide support for the validity of the BTPI in identifying clients at risk for premature termination from counseling.     

Stochastic catastrophe analysis of switches in the perception of apparent motion

Dynamical phenomena such as bistability and hysteresis have been found in a number of studies on perception of apparent motion. We show that new developments in stochastic catastrophe theory make it possible to test models of these phenomena empirically. Catastrophe theory explains discontinuous changes in responses caused by continuous changes in experimental parameters. We propose catastrophe models for two experimental paradigms on perception of apparent motion and present experiments that support these models. We test these models by using an algorithm for fitting stochastic catastrophe models. We derive from catastrophe theory the prediction that a dynamical phenomenon called divergence is necessary when hysteresis is found. This new prediction is supported by the data.     

The influence of therapist attention on self-injury during a tangible condition

This study investigated the effects of therapist attention on the self-injurious behavior (SIB) of a 6-year-old girl with developmental disabilities. After results of a functional analysis indicated that SIB was maintained by attention and tangible reinforcement, tangible conditions with and without contingent verbal attention were compared. Results suggested that the inclusion of verbal attention in a tangible condition may confound functional analysis outcomes for behavior that is maintained by attention.     

Reduction of work-family conflict through the use of selection, optimization, and compensation behaviors

Prior research has examined both the antecedents to and outcomes of work-family conflict. However, little is known about the existence and efficacy of behavioral strategies that may be used by individuals to reduce the amount of stressors experienced both on the job and at home, which result in work-family conflict. The purpose of this study was to examine the role of selection, optimization, and compensation (SOC) behaviors in relation to both job and family stressors and work-in-family (WIF) conflict and family-in-work (FIW) conflict. Results suggest that the use of general SOC behaviors in both the work and family domains are related to lower amounts of job and family stressors and subsequently lower amounts of WIF conflict and FIW conflict. In general, these results held true even when additional variables (e.g., hours worked, gender, job involvement, family involvement, social support, and supervisor support) were controlled. Implications of these results are discussed.     

青少年社会行为对同伴关系的影响

以349名初中一至三年级青少年为被试,采用同伴提名法和"班级戏剧"量表收集数据,考察社会行为对同伴关系的影响。结果表明:(1)"班级戏剧"量表中的30种社会行为可划分为亲社会行为、攻击行为、退缩行为和有争议行为四个方面;(2)亲社会行为和有争议行为能够正向预测同伴的正向提名,攻击和退缩行为能够正向预测同伴的反向提名,亲社会行为能正向预测社会喜好程度,而社会影响程度则主要是由亲社会、攻击和有争议行为预测的。(3)受欢迎组青少年的亲社会行为和有争议行为较多;被拒绝组的攻击和退缩行为较多;被忽视组的退缩行为最多;有争议组青少年的攻击行为、有争议行为和亲社会行为均较多,退缩行为最少。其中,受欢迎组和被拒绝组又可以根据被欢迎和拒绝的理由而划分出亚类型。     

Self-mutilation: a spiritual endeavor

This article explores the phenomenon of self-mutilatory behaviors among practitioners both today and throughout history with the intent of exposing what the author finds to be a radical correlation between mental illness and spirituality. It is the author's belief that today's strong focus on the biology of mental illness, though essential, will extend us only so far in our comprehension of mental pathology; and that an investigation into the spiritual needs of humankind may serve to round out our understanding.