Kosslyn S M, Alpert N M, Thompson W L, Chabris C F, Rauch S L, Anderson A K
Department of Psychology, Harvard University, Cambridge, MA 02138.
Brain. 1994 Oct;117 ( Pt 5):1055-71. doi: 10.1093/brain/117.5.1055.
Positron emission tomography scans were acquired when subjects performed three tasks, each in a separate block of trials. They decided whether words named pictures of objects viewed from a canonical perspective, decided whether words named pictures of objects viewed from a non-canonical (unusual) perspective or saw random patterns of lines and pressed a pedal when they heard the word (this was a baseline condition). The dorsolateral prefrontal region was activated when subjects identified objects seen from non-canonical perspectives, as expected if the frontal lobes are involved in top-down perceptual processing. In addition, several areas in the occipital, temporal and parietal lobes were selectively activated when subjects identified objects seen from non-canonical perspectives, as specifically predicted by a recent theory. Overall, the pattern of results supported the view that the human brain identifies objects by using a system of areas similar to that suggested by studies of other primates.
当受试者执行三项任务时，分别在每个单独的试验块中进行正电子发射断层扫描。他们要判断单词是否命名了从标准视角看到的物体图片，判断单词是否命名了从非标准（不寻常）视角看到的物体图片，或者观看随机的线条图案，并在听到单词时踩下踏板（这是基线条件）。正如预期的那样，如果额叶参与自上而下的感知处理，那么当受试者识别从非标准视角看到的物体时，背外侧前额叶区域会被激活。此外，当受试者识别从非标准视角看到的物体时，枕叶、颞叶和顶叶的几个区域会被选择性激活，这是最近一个理论所特别预测的。总体而言，结果模式支持了这样一种观点，即人类大脑通过使用一个类似于其他灵长类动物研究中所提出的区域系统来识别物体。
