Vanlierde Annick, De Volder Anne G, Wanet-Defalque Marie-Chantal, Veraart Claude
Neural Rehabilitation Engineering Laboratory, Université Catholique de Louvain, Brussels, Belgium.
Neuroimage. 2003 Jul;19(3):698-709. doi: 10.1016/s1053-8119(03)00153-8.
Using positron emission tomography, regional cerebral blood flow was studied in five early blind and five control volunteers during visuo-spatial imagery. Subjects were instructed to generate a mental representation of verbally provided bidimensional patterns that were placed in a grid and to assess pattern symmetry in relation to a grid axis. This condition was contrasted with a verbal memory task. Cerebral activation in both groups was similar during the visuo-spatial imagery task. It involved the precuneus (BA 7), superior parietal lobule (BA 7), and occipital gyrus (BA 19). These results are in accordance with previous studies conducted in sighted subjects that indicated that the same occipito-parietal areas are involved in visual perception as well as in mental imagery dealing with spatial components. The dorsal pathway seems to be involved in visuo-spatial imagery in early blind subjects, indicating that this pathway undergoes development in the absence of vision.
利用正电子发射断层扫描技术，在视觉空间意象任务期间，对5名早期失明志愿者和5名对照志愿者的局部脑血流量进行了研究。受试者被要求对口头提供的放置在网格中的二维图案生成心理表象，并评估图案相对于网格轴的对称性。该条件与言语记忆任务形成对比。在视觉空间意象任务期间，两组的大脑激活情况相似。它涉及楔前叶（BA 7）、顶上小叶（BA 7）和枕回（BA 19）。这些结果与之前对有视力受试者进行的研究一致，这些研究表明相同的枕顶区域参与视觉感知以及处理空间成分的心理意象。背侧通路似乎参与早期失明受试者的视觉空间意象，表明该通路在没有视觉的情况下会发生发育。
