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近期的脑成像研究在盲人等感官缺陷被试者身上发现了感觉替换现象,即传统上认为仅对单一感觉通道刺激反应的皮层区域也参与其他感觉通道的信息加工.类似的效应在感觉剥夺(蒙住眼睛)的明视人被试中也被观察到,提示脑内可能预存着多感觉交互作用的神经通路.通常认为,上述神经通路在常态的人脑中是以潜伏形式存在的,只有当感觉剥夺时才显露出来或得到加强.但是,感觉剥夺是否是该类神经通路发挥作用的必要条件,已有的研究尚缺乏确切的证据.采用统计力度较强的实验设计,给未蒙眼明视人被试听觉呈现一组名词,要求其对听到的每一个词语做出是人工物体还是自然物体的语义判断.对同步采集的功能磁共振信号进行统计分析,观察到视皮层脑区有显著激活.这些结果表明,跨感觉通道的神经通路在未实施感觉剥夺的条件下依然能够显示出来,因而在常态人脑中也不是完全以潜伏形式存在的.上述研究为建立多感觉交互作用神经机制的具体理论模型提供了一个约束条件.
Recent brain imaging studies have found sensory replacement in sensory-deficient subjects, such as blind, that cortical areas traditionally thought to respond only to a single sensory pathway are also involved in information processing in other sensory pathways. A similar effect is seen in sensory deprivation Blindfolded subjects) were also observed, suggesting that there may be pre-stored multi-sensory interaction in the brain neural pathway is generally believed that the above normal neural pathway in the human brain exists in a latent form, and only When feeling deprived, it is exposed or strengthened.However, whether sensory deprivation is a necessary condition for this kind of neural pathways, the exact evidence is lacking in the existing research.Using the experimental design with strong statistical power, A group of nouns as a group of nouns were asked to present semantic judgments on whether each word they heard was an artificial object or a natural object.Statistical analysis was performed on the functional magnetic resonance signals collected simultaneously and the visual cortex brain region Were significantly activated.These results show that the trans-sensory pathway of neural pathways in the absence of sensory deprivation of the conditions can still be displayed, State human brain does not exist entirely in latent form.The above study provides a constraint for establishing a concrete theoretical model of the neural mechanism of multi-sensory interaction.