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991.
Psychophysical and neurophysiological studies suggest that human body motions can be readily recognized. Human bodies are highly articulated and can move in a nonrigid manner. As a result, we perceive highly dissimilar views of the human form in motion. How does the visual system integrate multiple views of a human body in motion so that we can perceive human movement as a continuous event? The results of a set of priming experiments suggest that motion can readily facilitate the linkage of different views of a moving human. Positive priming was found for novel views of a human body that fell within the path of human movement. However, no priming was observed for novel views outside the path of motion. Furthermore, priming was restricted to those views that satisfied the biomechanical constraints of human movement. These results suggest that visual representation of human movement may be based upon the movement limitations of the human body and may reflect a dynamic interaction of motion and object-recognition processes. 相似文献
992.
When the right eye and the left eye view dissimilar scenes, the observer does not experience a stable superimposed percept of the images presented to the two eyes, but instead perceives an alternation between the images seen by each eye. A critical question confronting this robust and intriguing phenomenon of binocular rivalry is how the visual system selects the image to be perceived (dominant). The current main-stream literature emphasizes a bottom-up explanation in which the rivalry stimulus with the higher contour strength has the advantage, and becomes dominant in rivalry. Nevertheless, some workers in the past have favored an attention-selection explanation for binocular rivalry. We investigated the role of attention in binocular rivalry by employing novel psychophysical paradigms which capitalized on several established phenomena (e.g. the Cheshire Cat effect, attention cueing, pop-out effect). Our results revealed two major aspects of attention modulation in binocular rivalry. We found that a dominant image is less likely to be suppressed when voluntary attention is directed to it. This suggests the role of voluntary attention in retaining the dominant image in visual awareness. Second, a rivalry stimulus is more likely to become dominant if accompanied by a pop-out cue (in the same eye and proximity). Since a pop-out cue attracts involuntary attention to its location/eye, this result suggests that cue-mediated involuntary attention can promote the ability of a rivalry stimulus to reach visual awareness. 相似文献
993.
肿瘤治疗模式的哲学思考 总被引:4,自引:0,他引:4
外科手术往往是肿瘤治疗的首选方法,对于不能手术或已丧失手术机会者才考虑放疗,化疗。近年来,出现了诱导分化和凋亡等治疗手段,且在某些肿瘤的治疗上已取得了可喜的效果,这点新概念,新手术的出现,使得以往的肿瘤治疗模式受到了冲击,从以人为本,预防为主的哲学思想出发,我们似科可以提出这样的肿瘤治疗模式,诱导分化→启动凋亡→手术,放疗,化疗。 相似文献
994.
995.
New knowledge about the specific brain regions involved in depression is rapidly evolving due to advances in functional neuroimaging techniques. Several new regionally specific somatic interventions build on this modern neuroanatomic information. These latest methods promise to revolutionize the understanding and treatment of depression. This article reviews the past and current use of these techniques, with an eye toward where they are heading in the next century. 相似文献
996.
速示重复和非速示呈现下的汉字结构方式效应 总被引:6,自引:1,他引:5
在速示重复和非速示两种实验条件下考察了汉字大小和笔画数对结构方式效应的影响。在速示实验中,发现有结构方式主效应,并在小号字上以及两种笔画数的汉字上也存在结构方式效应;在非速示实验中,没有发现结构方式主效应,但在多笔画的小号汉字上和多笔画的中号汉字上存在结构方式效应。两个实验还表明,汉字的结构方式效应量值随着视觉条件的改善而减少。该文提出了用以解释结构方式效应的汉字空间通透性概念及其算法,并且讨论了解释结构方式效应量值随着视觉清晰度的改善而系统性减少的模型。 相似文献
997.
结构对称性汉语成语的认知研究 总被引:3,自引:0,他引:3
运用命名作业,从识别和再认两个方面探讨了结构对称性汉语成语的认知特点,结果发现:(1)成语识别有显著的结构对称效应和熟悉度效应;结构对称性成语的识别明显快于非对称性成语,高熟悉度成语的识别明显快于低熟悉度的成语。(2)成语再认的反应时有显著的结构对称效应,熟悉度效应不显著;而反应错误率则有显著的熟悉度效应,结构对称效应不显著。上述结果都不存在结构对称性和熟悉度之间的显著的交互作用。现有的西方拼音文字认知模型不能恰当地解释汉语成语的认知特点。 相似文献
998.
Depth rotations can reveal new object parts and result in poor recognition of "static" objects (Biederman & Gerhardstein, 1993). Recent studies have suggested that multiple object views can be associated through temporal contiguity and similarity (Edelman & Weinshall, 1991; Lawson, Humphreys & Watson, 1994; Wallis, 1996). Motion may also play an important role in object recognition since observers recognize novel views of objects rotating in the picture plane more readily than novel views of statically re-oriented objects (Kourtzi & Shiffrar, 1997). The series of experiments presented here investigated how different views of a depth-rotated object might be linked together even when these views do not share the same parts. The results suggest that depth rotated object views can be linked more readily with motion than with temporal sequence alone to yield priming of novel views of 3D objects that fall in between "known" views. Motion can also enhance path specific view linkage when visible object parts differ across views. Such results suggest that object representations depend on motion processes. 相似文献
999.
In three experiments, subjects attempted to track multiple items as they moved independently and unpredictably about a display. Performance was not impaired when the items were briefly (but completely) occluded at various times during their motion, suggesting that occlusion is taken into account when computing enduring perceptual objecthood. Unimpaired performance required the presence of accretion and deletion cues along fixed contours at the occluding boundaries. Performance was impaired when items were present on the visual field at the same times and to the same degrees as in the occlusion conditions, but disappeared and reappeared in ways which did not implicate the presence of occluding surfaces (e.g., by imploding and exploding into and out of existence instead of accreting and deleting along a fixed contour). Unimpaired performance did not require visible occluders (i.e., Michotte's tunnel effect) or globally consistent occluder positions. We discuss implications of these results for theories of objecthood in visual attention. 相似文献
1000.
Z Bujas S Szabo D Ajdukovi? D Mayer 《Journal of experimental psychology. Human perception and performance》1991,17(4):1120-1126
The influence of adaptation to taste stimuli of 1 quality on tastants with other qualities was investigated by comparing the reaction time (RT) to a test solution after adapting-solution flow with the RT to the same test solution after water flow. Adapting solutions were strong concentrations of NaCl, HCl, QHCl, and sucrose; test solutions were the same compounds but in lower concentrations. Adaptation to sucrose significantly shortened RT to NaCl and HCl, and to a lesser degree to QHCl. A similar cross-enhancement was found in sucrose when other compounds served as adapting solutions, In all other taste combinations, only a cross-adaptation effect was observed. Results are discussed in relation to some adaptation phenomena, water taste data, and magnitude-estimation data. 相似文献