Stimulating illusory own-body perceptions

'Out-of-body' experiences (OBEs) are curious, usually brief sensations in which a person's consciousness seems to become detached from the body and take up a remote viewing position. Here we describe the repeated induction of this experience by focal electrical stimulation of the brain's right angular gyrus in a patient who was undergoing evaluation for epilepsy treatment. Stimulation at this site also elicited illusory transformations of the patient's arm and legs (complex somatosensory responses) and whole-body displacements (vestibular responses), indicating that out-of-body experiences may reflect a failure by the brain to integrate complex somatosensory and vestibular information.     

Induction of an illusory shadow person

Stimulation of a site on the brain's left hemisphere prompts the creepy feeling that somebody is close by. The strange sensation that somebody is nearby when no one is actually present has been described by psychiatric and neurological patients, as well as by healthy subjects, but it is not understood how the illusion is triggered by the brain. Here we describe the repeated induction of this sensation in a patient who was undergoing presurgical evaluation for epilepsy treatment, as a result of focal electrical stimulation of the left temporoparietal junction: the illusory person closely 'shadowed' changes in the patient's body position and posture. These perceptions may have been due to a disturbance in the multisensory processing of body and self at the temporoparietal junction.     

Three-dimensional illusory contours and surfaces.

Under general viewing conditions, objects are often partially camouflaged, obscured or occluded, thereby limiting information about their three-dimensional position, orientation and shape to incomplete and variable image cues. When presented with such partial cues, observers report perceiving 'illusory' contours and surfaces (forms) in regions having no physical image contrast. Here we report that three-dimensional illusory forms share three fundamental properties with 'real' forms: (1) the same forms are perceived using either stereo or motion parallax cues (cue invariance); (2) they retain their shape over changes in position and orientation relative to an observer (view stability); and (3) they can take the shape of general contours and surfaces in three dimensions (morphic generality). We hypothesize that illusory contours and surfaces are manifestations of a previously unnoticed visual process which constructs a representation of three-dimensional position, orientation and shape of objects from available image cues.     

DAI中的感知问题

本文对分布式人工智能（ＤｉｓｔｒｉｂｕｔｅｄＡｒｔｉｆｉｃｉａｌＩｎｔｅｌｌｉｇｅｎｃｅ，ＤＡＩ）中感知技术的研究及其重要性做了简要介绍。对ＤＡＩ中，感知的一些概念、需要感知的一些主要对象、感知在ＤＡＩ中的一些应用等问题进行了阐述。     

初探当代艺术感性

当代艺术是一个以文化的身体体验为原发的"生活世界",体现人类的自由需求和潜能。当代艺术感性的理论主要以梅洛—庞蒂的知觉现象学为理论依据,对艺术感性要素的分析主要体现在身体化、知觉化,语言暴力化及由此而生成的新的社会批评中。     

基于嵌入式系统的听觉与时间知觉测试仪

依据实验心理学对听觉测试与时间知觉测试的要求,设计开发了一种以嵌入式微控制器LPC2214为硬件核心,以实时操作系统μC/OS-Ⅱ为软件开发平台的"听觉与时间知觉测试仪".在此基础上,实现了测试仪的硬件电路和软件程序,并完成了仪器的原理样机调试.     

混响感的因素分析

混响时间是影响混响感的重要因素,但并不是唯一因素.为探讨不同因素对混响感的影响,首先用问卷调查的方法对混响感的影响因素进行了汉语语义调查,根据语意调查结果针对对混响感具有较大影响的几种因素采用尺度估计法设计了一系列主观听感实验,实验结果表明除混响时间外,声压级、频率、感知距离、平均吸声系数和反射声方向等因素也对混响感具有显著影响,除上述因素外,被试者所聆听的声音内容对混响感也会产生不同程度的影响.     

Perception of shape from shading

The human visual system can rapidly and accurately derive the three-dimensional orientation of surfaces by using variations in image intensity alone. This ability to perceive shape from shading is one of the most important yet poorly understood aspects of human vision. Here we present several findings which may help reveal computational mechanisms underlying this ability. First, we find that perception of shape from shading is a global operation which assumes that there is only one light source illuminating the entire visual image. This implies that if two identical objects are viewed simultaneously and illuminated from different angles, then we would be able to perceive three-dimensional shape accurately in only one of them at a time. Second, three-dimensional shapes that are defined exclusively by shading can provide tokens for the perception of apparent motion, suggesting that the motion mechanism is remarkably versatile in the kinds of inputs it can use. Lastly, the occluding edges which delineate an object from its background can also powerfully influence the perception of three-dimensional shape from shading.     

视知觉中的同胚律

本文提出了视知觉中的同胚律——当一类景物在容限内进行同胚变换时,人的视知觉存在不受景物同胚变换影响的现象。     

视知觉中的同胚律

本文提出了视知觉中的同胚律——当一类景物在容限内进行同胚变换时,人的视知觉存在不受景物同胚变换影响的现象.     

感知服务质量的研究综述

回顾了感知服务质量的相关研究文献,归纳了感知服务质量的概念界定、维度划分、评价模型及评价方法等方面的研究现状,最后在总结现有研究局限和不足的基础上,展望了未来的研究方向。     

稳态风场下的沙粒运动规律

风沙运动是风沙地貌以及土壤侵蚀的主要原因,跃移运动是风沙运动的主要形式,跃移沙粒占整个运动沙粒的75%左右,这一运动不仅是沙量传输的主要运动形式,也是造成沙质地表风蚀和风沙灾害的根本原因.通过数值模拟的方式研究了当风沙运动达到稳定状态时的风沙流运动特征,详细讨论了稳态情况下沙粒的跃移运动规律,以期对防沙治沙工作能起到一定的指引.研究结果表明:在不同的初始风速条件下,当风沙运动达到稳定状态时在高度小于10倍的沙粒直径处的风速基本相同,这是由于地表风场被运动沙粒强烈修正,有效粗糙度随着摩阻风速的增加而增加;同时在给定的风场风速下,跃移轨迹和碰撞速度并不是无限增大的,而是存在最大的跃移轨迹和最大的碰撞速度,并且最大碰撞速度以及最大跃移轨迹的高度和长度与摩阻速度成线性关系.     

《计算机图形学》的教学认知与实践

针对计算机图形学的特点及其教学中出现的一些问题,提出了进一步改进课堂教学、实验等教学环节的方法。实践表明,文中提出的方法对加深课程的理解、培养学生学习兴趣和提高课程教学质量具有明显的作用。     

深生态道德的哲学意境

深生态道德是以经济、政治、社会和伦理等多重视角来看待和认识自然和生态问题,以哲学思维来思考和研究人以及人类社会与自然界所有物种之间的关系的哲学新类。其哲学意境在于从道德层面向世人展示人以及社会与自然界各物种协同进化的生态世界观、生态价值观和生态方法论,从而塑造全新的生态道德观。     

窦娥形象美感内质浅论

《窦娥冤》塑造了窦俄这一栩栩如生的艺术形象，奏响了一曲感人肺腑的悲歌。从人性美、悲壮美、雄奇美三个方面探讨窦娥形象的美感内质，不仅可以把握窦娥形象的本美，也可以认识其流变美。