Physiological and Psychophysical Studies of Spatial Vision

9309826 德瓦卢瓦 视觉系统能够区分可见物体的几个空间特征，包括形状，纹理和运动。 根据解剖学和功能标准，大脑的视觉皮层被细分为许多不同的区域。 有生理记录显示大脑对视觉刺激的活动反应，但皮层组织与“看”过程的关系是复杂的，还不清楚。 心理物理测试使用定量定义明确的光学刺激，同时测量对诸如可检测性或可辨别性等属性的反应。 该项目使用相同的刺激进行心理物理测试和生理测试，以直接确定皮层各级神经细胞参与处理模式的程度。 新的刺激被利用，将模式与空间成分过滤在各种量化指定的方式。 特别是，是否从根本上不同的过程中使用的纹理歧视和形式歧视的问题将得到解决。 研究结果将有助于我们理解大脑如何处理信息，并将对视觉神经生物学和更广泛的神经科学产生影响，可能应用于计算视觉，人工视觉架构和视觉显示系统。 ***

9309826 De Valois The visual system is able to distinguish several spatial features of visible objects, including form, texture and motion. The visual cortex of the brain has been subdivided into a many different areas based on both anatomical and functional criteria. There are physiological recordings showing the activity responses in the brain to visual stimuli, but the nature of how that cortical organization relates to the process of "seeing" is complex and not yet clear. Psychophysical tests use quantitatively well-defined optical stimuli while measuring responses to properties such as detectability or discriminability. This project uses identical stimuli for psychophysical tests and for physiological tests to determine directly to what extent the nerve cells in various levels of the cortex participate in processing patterns. Novel stimuli are exploited that incorporate patterns with the spatial components filtered in various quantifiably specified ways. In particular, the question of whether fundamentally different processes are used in texture discrimination and form discrimination will be addressed. Results will be valuable to our understanding of how the brain processes information, and will have an impact on visual neurobiology and more broadly to neuroscience, with likely application to computational vision, to artificial vision architecture and to visual display systems. ***