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The static form of the size-distance invariance hypothesis asserts that a given proximal stimulus size (visual angle) determines a unique and constant ratio of perceived-object size to perceived object distance. A proposed kinetic invariance hypothesis asserts that a changing proximal stimulus size (an expanding or contracting solid visual angle) produces a constant perceived size and a changing perceived distance such that the instantaneous ratio of perceived size to perceived distance is determined by the instantaneous value of visual angle. The kinetic invariance hypothesis requires a new concept, an operating constraint, to mediate between the proximal expansion or contraction pattern and the perception of rigid object motion in depth. As a consequence of the operating constraint, expansion and contraction patterns are automatically represented in consciousness as rigid objects. In certain static situations, the operation of this constraint produces the anomalous perceived-size-perceived-distance relations called the size-distance paradox.  相似文献   
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Abstract

This study has examined children's estimates of dental anxiety and pain before and after a standard dental treatment session consisting of a local analgesic and drilling procedures. A method of assessing intensity of pain while receiving dental treatment was devised, and measures of the child's uncooperativeness and the dentist's supportive behaviour including treatment time was collected. Results showed that there was an immediate reduction in dental anxiety following exposure to dental procedures for those children referred because of their previous uncooperativeness. The reduction in anxiety was not attributed to supportive behaviour of the dentist. Children referred as unco-operative recorded higher pain intensity to comparison children.  相似文献   
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Jonathan Martin was a fundamentalist itinerant Christian preacher. Outraged by the laxity of Church of England clergy and inspired by prophetic dreams, he set fire to York Minster in 1829. At his trial for this capital offence, medical expert witnesses argued that Jonathan Martin was suffering from monomania and he was incarcerated for the rest of his life in Bethlem Hospital. This paper reviews the medico-legal use of the insanity defence in cases of religious motives for grave offences from the early 19th Century, and describes the millenarian climate of the period as well as the phenomenon of biblical exegesis and prophecy. Finally, the case of a contemporary bible-inspired arsonist is reviewed and his medical mitigation and 'disposal' is compared with that of Jonathan Martin.  相似文献   
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Youth today often face challenges that can undermine important opportunities to achieve their full potential in school, in the workplace, in relationships, and within themselves. This article reviews the literature addressing certain personal qualities that have shown promise in the promotion of youth resilience against such threats. More specifically, the values of forgiveness, purpose, and religiosity are considered. The purpose of this literature review is to bring attention to the promise that this body of research has shown and to encourage the continued empirical study of forgiveness, purpose, and religiosity, particularly within the realm of youth mental health and well-being. First, operational definitions of these constructs are discussed. This is followed by discussion of theoretical, clinical, and empirical support for the benefits of strongly upholding values related to forgiveness, purpose, and religiosity during youth. Finally, practical implications and directions for future research are offered.  相似文献   
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We examined the prevalence of behavior problems and their relationship to child, parent, and family factors in 76 children with or at risk for developmental delay. Parents reported that 42% of the children had behavior problems. Child Behavior Checklist (CBC) scores revealed that 25% of the sample scored above the borderline cutoff. Although the total, externalizing, and internalizing mean CBC scores did not differ from the normative group (same-aged peers without developmental delay), each of the syndrome subscales was significantly higher in the study group. The Reiss Scales for Children's Dual Diagnosis revealed that, as compared to older children (4 years) with developmental delay, the study sample scored significantly lower on the total score and 8 of the 10 subscales. Increased CBC total scores were significantly related to dependency and management of the child, birth weight, gestational length, paternal illness, maternal depression, perceived personal burden of care, maternal escape-avoidance coping strategy, family disharmony, and financial stress. CBC total scores were significantly negatively correlated with being of a multiple birth, paternal education, maternal employment, two-parent family, family social support, and family income. Multiple regression analyses revealed that an empirically-derived combination of child, parent, and family variables accounted for 31% of the variance in CBC total scores. Our findings suggest that 2-year old children with or at-risk for developmental delay may already be showing signs of increased risk of behavior problems relative to peers without developmental delay. We identified several child, parent, and family variables that may help to pinpoint children at increased riskxs for psychopathology.  相似文献   
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