a Faculty of Psychology and Educational Sciences , University of Coimbra , Coimbra , Portugal.
b Faculty of Psychology and Educational Sciences , Proaction Laboratory, University of Coimbra , Coimbra , Portugal.
Cogn Neuropsychol. 2018 Jul-Sep;35(5-6):288-303. doi: 10.1080/02643294.2018.1463980. Epub 2018 May 24.
A major principle of organization of the visual system is between a dorsal stream that processes visuomotor information and a ventral stream that supports object recognition. Most research has focused on dissociating processing across these two streams. Here we focus on how the two streams interact. We tested neurologically-intact and impaired participants in an object categorization task over two classes of objects that depend on processing within both streams-hands and tools. We measured how unconscious processing of images from one of these categories (e.g., tools) affects the recognition of images from the other category (i.e., hands). Our findings with neurologically-intact participants demonstrated that processing an image of a hand hampers the subsequent processing of an image of a tool, and vice versa. These results were not present in apraxic patients (N = 3). These findings suggest local and global inhibitory processes working in tandem to co-register information across the two streams.
视觉系统组织的一个主要原则是在处理视动信息的背侧流和支持物体识别的腹侧流之间。大多数研究都集中在分离这两个流的处理上。在这里，我们关注的是这两个流如何相互作用。我们在两个物体类别中测试了神经健全和受损的参与者的物体分类任务，这两个类别都依赖于两个流的处理——手和工具。我们测量了对一个类别的图像（例如工具）的无意识处理如何影响对另一个类别的图像（即手）的识别。我们对神经健全的参与者的发现表明，处理一只手的图像会阻碍对工具图像的后续处理，反之亦然。这些结果在失用症患者（N=3）中并不存在。这些发现表明，局部和全局抑制过程协同作用，在两个流之间共同注册信息。
