Spatial Representations and Attention

空间表示和注意力

• 批准号: 7261192
• 负责人: LYNN Clarine ROBERTSON
• 金额: $ 28.04万
• 依托单位: UNIVERSITY OF CALIFORNIA BERKELEY
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-12-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7261192
• 关键词: 3-Dimensional; Accounting; Address; Affect; Area; Attention; Awareness; Bilateral; Binding; Blindness; Brain; Brain Injuries; Caliber; Chiroptera; Code; Color; Computer-Assisted Image Analysis; Condition; Detection; Development; Dimensions; Dorsal; Event; Extinction (Psychology); Human; Influentials; Knowledge; Left; Lesion; Literature; Location; Manufactured Baseball; Maps; Modeling; Motion; Neurologic; Neurology; Numbers; Operative Surgical Procedures; Parietal; Parietal Lobe; Patients; Perception; Performance; Play; Population; Process; Property; Psychophysiology; Reporting; Research Design; Research Personnel; Resources; Role; Sensory; Shapes; Side; Speed; Stimulus; Stroke; Structure; Sum; Syndrome; System; Testing; Texture; Time; Value Meaning; Vision; Visual; Visual Spatial Disorder; Visual system structure; base; experience; extrastriate visual cortex; hemisphere damage; impression; inattention; millisecond; neglect; programs; relating to nervous system; response; size; spatial neglect; spatial relationship; statistics; theories; visual information; visual process; visual processing

DESCRIPTION (provided by applicant): Right hemisphere damage in humans often leads to unilateral spatial neglect and/or extinction, a condition in which patients do not orient to, and may even deny the existence of, the left side of space. The syndrome has been most often associated with dorsal right posterior lesions. Consistently, when both parietal lobes are damaged (causing Balint's syndrome), external space nearly disappears entirely except for the perception of one object at any given time (simultanagnosia). Despite the often severe spatial blindness that accompanies these lesions, stimuli presented in affected areas of space can be implicitly represented (i.e., they affect performance even when undetected). A common interpretation is that the representation is intact and all that is needed is a boost above some threshold. This idea had been questioned by evidence showing that features are not integrated correctly in such cases, producing illusory conjunctions in free vision. The features that were tested were those that have been associated with specialized neural populations such as color, motion, shape and size. However, these findings only tested explicit reports. We propose a set of psychophysical studies designed to explore the extent to which features are integrated in implicit representations and what the spatial structure of these representations might be. Emphasis will be on patients who have spatial deficits due to unilateral stroke. Some questions to be addressed are: Are undetected stimuli integrated before attentional selection occurs? What is the spatial structure of implicit representations (e.g., are they 3-dimensional)? Do features of neglected stimuli contribute to first impressions of displays that are explicitly perceived? The findings should enhance knowledge of visual information that is processed before awareness in normal perception as well as how this information may influence what is explicitly seen. It will also increase knowledge about visual representations that are intact but unavailable in visual spatial disorders.

描述（由申请人提供）：人类右半球损伤通常导致单侧空间忽视和/或消失，患者无法定向，甚至可能否认左侧空间的存在。该综合征最常与右后背病变相关。同时，当两个顶叶都受损时（引起巴林特综合征），外部空间几乎完全消失，除了在任何给定时间对一个物体的感知（视觉失认症）。尽管伴随这些病变的通常是严重的空间盲，但是在受影响的空间区域中呈现的刺激可以被隐含地表示（即，它们甚至在未被检测时也影响性能）。一种常见的解释是，表示是完整的，所需要的只是提升到某个阈值以上。这一观点受到了质疑，有证据表明，在这种情况下，特征没有正确整合，在自由视觉中产生了虚幻的连接。测试的特征是那些与特定神经群体相关的特征，如颜色、运动、形状和大小。然而，这些发现只测试了明确的报告。我们提出了一套心理物理学的研究，旨在探讨在何种程度上的功能集成在隐式表示和这些表示的空间结构可能是什么。重点将放在因单侧卒中而出现空间缺陷的患者身上。一些问题要解决的是：未检测到的刺激整合注意选择发生之前？隐式表示的空间结构是什么（例如，是三维的吗？被忽视的刺激的特征是否会对被明确感知的显示的第一印象产生影响？这些发现应该增强对视觉信息的认识，这些信息在正常感知中是在意识之前处理的，以及这些信息如何影响所看到的内容。它还将增加有关视觉表征的知识，这些视觉表征是完整的，但在视觉空间障碍中不可用。