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Cave Kyle教授访问本课题组
2010年10月14日至11月15日期间，Kyle Cave 教授访问本课题组。
Professor Kyle Cave is a professor of Psychology at the University of Massachusetts Amherst. He earned his B.A. degree at Harvard University in 1983, and Ph. D degree at MIT (Massachusetts Institute of Technology) in 1989. His main research interests cover the various aspects of visual cognition, including visual attention, visual imagery, and object recognition. Much of his current research is designed to answer basic questions about when and why visual attention is necessary. His most important contribution is the FeatureGate model of attentional selection.
学术报告：Expanding our View of Attention: Multiple Targets and Spatial Gradients
Speaker：KYLE CAVE
时间：11月12日（周五）下午14:00
地点：东楼D104教室
Abstract
Many attention theories portray visual selection as a process that starts with a representation of target features and selects regions containing those features. I will describe two sets of experiments that were designed to expand and develop this at 
tentional framework.
The first study used eye-tracking to explore the nature of the target representation that guides visual search, and how that guidance deteriorates during search for two different target features. When the target representation has just one colour, distractors with nontarget colours are avoided very effectively. However, when the target representation includes two different colours, this colour selectivity deteriorates, resulting in more fixations to colours that are not similar to either target.
The second study explored the spread of attention from a cued location to surrounding regions in the visual field. Attention often takes the form of a gradient, with the facilitation declining gradually with distance from the cued location. The nature of this gradient provides clues to the function of attention in visual processing. We explored this gradient using spatial ERP probes. The results revealed two separate attentional effects. Early in processing, a very large region around the cued location was selected, indicated by large amplitude in the N1 component. Later in processing, there was a more precise selection of the region including information relevant to the task, which could be seen in the N2 component. This pattern suggests that spatial attention shifts from a broad focus to a more narrow focus over time.