Funnell M G, Corballis P M, Gazzaniga M S
Center for Cognitive Neuroscience, Dartmouth College, USA.
Brain Cogn. 2001 Jun-Jul;46(1-2):135-9. doi: 10.1016/s0278-2626(01)80051-8.
Recent research has demonstrated that memory for words elicits left hemisphere activation, faces right hemisphere activation, and nameable objects bilateral activation. This pattern of results was attributed to dual coding of information, with the left hemisphere employing a verbal code and the right a nonverbal code. Nameable objects can be encoded either verbally or nonverbally and this accounts for their bilateral activation. We investigated this hypothesis in a callosotomy patient. Consistent with dual coding, the left hemisphere was superior to the right in memory for words, whereas the right was superior for faces. Contrary to prediction, performance on nameable pictures was not equivalent in the two hemispheres, but rather resulted in a right hemisphere superiority. In addition, memory for pictures was significantly better than for either words or faces. These findings suggest that the dual code hypothesis is an oversimplification of the processing capabilities of the two hemispheres.
最近的研究表明，对单词的记忆会引发左半球激活，对面孔的记忆会引发右半球激活，对可命名物体的记忆会引发双侧激活。这种结果模式归因于信息的双重编码，左半球采用言语编码，右半球采用非言语编码。可命名物体既可以通过言语编码，也可以通过非言语编码，这就解释了它们的双侧激活。我们在一名胼胝体切开术患者身上对这一假设进行了研究。与双重编码一致，左半球在单词记忆方面优于右半球，而右半球在面孔记忆方面更具优势。与预测相反，两个半球在可命名图片上的表现并不相同，而是右半球更具优势。此外，对图片的记忆明显优于对单词或面孔的记忆。这些发现表明，双重编码假设过于简化了两个半球的加工能力。
