各位老师，您好：

由实验室邀请了西安大略大学的Melvyn A. Goodale教授来做报告。报告信息如下，欢迎感兴趣的老师和同学来听。

报告时间：2012年4月6日，上午9:30-12:00

报告地点：小楼三楼大会议室

报告主题：

Action without Perception: What  blindsight can tell us about the neural substrates of visuomotor  control.

报告摘要：

Human beings are capable of reaching  out and grasping objects with great accuracy and precision – and vision plays a critical role in  this ability. The visual guidance of skilled movements, however, requires  transformations of incoming visual information that are quite different from  those required for visual perception. For us to grasp an object successfully,  our brain must compute the actual (absolute) size of the goal object, and its  orientation and position with respect to our hand and fingers – and must ignore  the relative size or distance of the object with respect to other elements in  the visual array. These differences in the required computations have led to the  emergence of dedicated visuomotor modules in the dorsal visual stream that are  quite separate from the networks in the ventral visual stream that mediate our  conscious perception of the world. Evidence from a broad range of experiments  has shown that the selection of goal objects and appropriate courses of action  depends on the perceptual machinery of the ventral stream and associated  cognitive modules. The programming and on-line control of goal-directed actions,  however, are mediated by dedicated visuomotor networks in the dorsal stream and  associated motor areas. Although the dorsal stream receives prominent inputs  from primary visual cortex, visual information also reaches this region of the  brain via subcortical pathways outside the geniculo-striate route. I will  present evidence showing that individuals with large lesions of primary visual  cortex can perform a broad range of skilled visually guided movements including  scaling the hand in flight for the size of goal objects and avoiding obstacles  in the workspace of the hand. In addition, I will present fMRI data showing that  such ‘blindsight’ patients continue to show task-related activation in  dorsal-stream areas that have been implicated in the visual control of reaching  and grasping.   Taken together, these results suggest that  extra-geniculos-triate projections to the dorsal stream are capable of mediating  the processing of object features such as size, shape, and orientation for the  control of visually guided grasping – but also raise questions about what the  role the inputs from primary visual cortex play in visuomotor  control.

报告人介绍: 

Melvyn A.  Goodale教授是西安大略大学的Distingiushed Professor，加拿大视觉神经科学学会的主席，大脑和思想研究所的主任，他从70年代开始长期致力于视觉神经科学、行动与认知等领域的科学研究，发表多篇科学论文，其中有两篇在NATURE上发表，引起广泛关注。

    此致

敬礼！

认知神经科学与学习国家重点实验室

2012年4月1日