Collaborative Research: Modeling Perception and Memory: Studies in Priming

协作研究：感知与记忆建模：启动研究。加州大学圣地亚哥分校Shiffrin，印第安纳州UniversityThis奖是根据2009年美国复苏和再投资法案（公法111-5）资助。都说“眼见为实”，我们理所当然地认为视觉的运作高效而准确。这表明视觉很容易。然而，制造计算机视觉的失败尝试表明恰恰相反-视觉可能是大脑执行的最困难的操作，需要三分之一的新皮层。由美国国家科学基金会资助的研究项目由加州大学圣地亚哥分校的大卫·胡贝尔和印第安纳州大学的理查德·希夫林共同进行，他们关注的是视觉感知中的一个重要问题：我们如何将当前看到的东西与之前看到的东西区分开来？事实上，随着时间的推移，视觉不断地将信息“模糊”在一起，例如当在电影院观看由快速连续显示的静止图像序列产生的平滑运动时。然而，在阅读时，我们的眼睛不断地从一个单词移到下一个单词，但与电影不同的是，我们单独看到每个单词，不会将其与前一个单词混淆。为了做到这一点，大脑必须有一个技巧来决定什么时候前一个图像应该与下一个图像合并，什么时候每个图像应该分开。Huber和Shiffrin假设，识别每个单词或每个电影图像的过程会导致它被抑制，以减少与下一个单词或图像的不适当混合。在电影的情况下，图像出现太短暂，混合产生明显的运动。在阅读的情况下，我们的眼睛停留在每个单词上的时间正好合适，以充分识别和抑制每个单词，从而减少与下一个单词的混淆。Huber和Shiffrin研究了在各种任务中分离视觉图像的能力，包括阅读，面部识别和快速检测变化，仅举几个例子。如果他们的假设是正确的，操纵刺激的时间应该在所有这些情况下产生类似的行为效应。除了实验室研究之外，这一假设还可以在需要快速识别的情况下改进计算机视觉系统。例如，机场的计算机控制摄像机可能被用来识别嫌疑人的面孔，但这需要在有一群人快速通过摄像机时将一张面孔与另一张面孔分开。这项研究的结果也可能与自闭症、精神分裂症和阅读障碍等疾病有关，这些疾病通常涉及扭曲或异常感知的一部分。例如，一种关于阅读障碍的解释表明，阅读困难是由于字母和单词的不恰当混合造成的。了解大脑在一段时间内分离视觉信息的方式可能有助于诊断、解释和治疗这些感知缺陷。人类的感知系统接收不断变化的信息。例如，眼睛每秒移动几次，提供不同物体或单词的不同视图。本项目研究在时间和空间上分离与先前来源有关的信息的动态过程（例如，先前查看的单词）从属于当前源的信息（例如，当前查看的单词）。行为研究将解决折扣的过程，以减少由于源混淆的感知分离错误。这个贴现过程可以在多个层次的描述和拟议的实验测试互补和相关的数学模型在因果和神经层次的分析理解。两个因果模型使用贝叶斯统计技术，并专注于优化感知在一个嘈杂的世界感知与有限的处理系统的能力;折扣实现为“解释”之间的竞争源。神经模型通过突触资源的短暂耗尽而产生的习惯化来实现折扣。结合起来，这些模型展示了为什么存在感知折扣以及实现感知折扣的特定方式。各种各样的实验范式涉及视觉对象的快速呈现，所提出的研究使用这些模型来调查感知源混淆和折扣是否可以提供这些现象的统一解释。除了视觉短时词汇启动外，本研究还考察了常见的知觉和认知范式：重复盲视、侧翼效应、注意瞬脱、负启动、语义饱和和情感启动。所有这些范例都涉及在计算机屏幕上呈现图片、单词或符号，然后是与第一次呈现相同、正相关或负相关的第二次呈现。这一奋进的一个重要目标是提供一个统一的帐户，这些知觉现象，目前被认为是孤立的研究人员。

Collaborative Research: Modeling Perception and Memory: Studies in PrimingDavid E. Huber, University of California-San DiegoRichard M. Shiffrin, Indiana UniversityThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). It is said that "seeing is believing", and we take it for granted that vision operates efficiently and accurately. This suggests that vision is easy. However, failed attempts at producing computer vision demonstrate exactly the opposite--vision is perhaps the most difficult operation performed by the brain, requiring one third of the neocortex. The NSF-funded research project being conducted by David Huber at the University of California, San Diego and Richard Shiffrin at Indiana University focuses on an important question in visual perception: How is it that we can keep separate what we are currently viewing from that which came immediately before? In truth, vision is constantly "blurring" together information over time, such as when viewing the smooth motion at the cinema that is produced by a sequence of still images shown in rapid succession. However, while reading, our eyes constantly move from one word to the next, and yet unlike a movie, we see each word separately and do not confuse it with the previous words. To accomplish this, the brain must have a trick for deciding when the previous image should be combined with the next image and when each should be kept separate. Huber and Shiffrin hypothesize that the process of identifying each word or each movie image causes it to be suppressed so as to reduce inappropriate blending with the next word or image. In the case of a movie, the images appear too briefly, and the blending produces apparent movement. In the case of reading, our eyes dwell on each word exactly the right amount of time to fully identify and suppress each word so as to reduce confusion with the next word. Huber and Shiffrin investigate this ability to separate visual images in a variety of tasks, including reading, face identification, and rapid detection of change, to name just a few examples. If their hypothesis is correct, manipulating the timing of stimuli should produce analogous behavioral effects in all of these situations. Beyond laboratory studies, this hypothesis may also improve computer vision systems in situations requiring rapid identification. For instance, computer controlled cameras at the airport might be used to identify faces of suspects, but this requires separating one face from another when there is a crowd of faces moving quickly past the camera. The results of this research may also be relevant to disorders such as autism, schizophrenia, and dyslexia, which often involve a component of distorted or abnormal perception. For instance, one account of dyslexia suggests that reading difficulties arise from an inappropriate blending of letters and words. Understanding the manner in which the brain separates visual information over time may help with the diagnosis, interpretation, and treatment of these perceptual deficits.The human perceptual system receives a constant stream of continually changing information. For example, the eyes move several times each second, providing different views of different objects or words. This project investigates the dynamic process of separating in time and space information pertaining to previous sources (e.g., a previously viewed word) from information pertaining to the current source (e.g., the currently viewed word). Behavioral studies will address the process of discounting that serves to reduce perceptual separation errors due to source confusion. This discounting process can be understood at multiple levels of description and the proposed experiments test complimentary and related mathematical models at the causal and neural levels of analysis. Two causal models use Bayesian statistical techniques and focus on optimizing perception in a noisy world perceived with a limited capacity processing system; discounting is implemented as "explaining away" between competing sources. The neural model implements discounting through habituation that arises with the transient depletion of synaptic resources. In combination, these models demonstrate why perceptual discounting exists and the particular manner in which it is implemented. A wide variety of experimental paradigms involve the rapid presentation of visual objects and the proposed studies use these models to investigate whether perceptual source confusion and discounting may provide a unified account of these phenomena. Besides visual short-term priming with words, the proposed studies examine the popular perceptual and cognitive paradigms of repetition blindness, flanker effects, the attentional blink, negative priming, semantic satiation, and affective priming. All of these paradigms involve presenting a picture, word, or symbol on a computer screen followed by a second presentation that is either identical, positively related, or negatively related to the first presentation. An important goal of this endeavor is to provide a unified account of these perceptual phenomena that are currently considered in isolation by researchers.