Kellenbach M L, Brett M, Patterson K
MRC Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge CB2 2EF, England.
Cogn Affect Behav Neurosci. 2001 Sep;1(3):207-21. doi: 10.3758/cabn.1.3.207.
Position emission tomography was used to investigate whether retrieval of perceptual knowledge from long-term memory activates unique cortical regions associated with the modality and/or attribute type retrieved. Knowledge about the typical color, size, and sound of common objects and animals was probed, in response to written words naming the objects. Relative to a nonsemantic control task, all the attribute judgments activated similar left temporal and frontal regions. Visual (color, size) knowledge selectively activated the right posterior inferior temporal (PIT) cortex, whereas sound judgments elicited selective activation in the left posterior superior temporal gyrus and the adjacent parietal cortex. All of the attribute judgments activated a left PIT region, but color retrieval generated more activation in this area. Size judgments activated the right medial parietal cortex. These results indicate that the retrieval of perceptual semantic information activates not only a general semantic network, but also cortical areas specialized for the modality and attribute type of the knowledge retrieved.
正电子发射断层扫描被用于研究从长期记忆中提取感知知识是否会激活与所提取的模态和/或属性类型相关的独特皮质区域。针对命名物体的书面文字，探究了关于常见物体和动物的典型颜色、大小及声音的知识。相对于非语义控制任务，所有属性判断均激活了相似的左侧颞叶和额叶区域。视觉（颜色、大小）知识选择性地激活了右侧后颞下回（PIT）皮质，而声音判断则在左侧颞上回后部及相邻的顶叶皮质引发了选择性激活。所有属性判断均激活了左侧PIT区域，但颜色提取在该区域产生了更多激活。大小判断激活了右侧内侧顶叶皮质。这些结果表明，感知语义信息的提取不仅激活了一个通用的语义网络，还激活了专门负责所提取知识的模态和属性类型的皮质区域。
