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世界核心医学期刊文摘（神经病学分册） 2005年第8期1卷 13-14页

作者： ptito m. m.esgaard S.m. Gjedde A. Kupers R. 郭俊 School of Optom.try Université de Montréal CP 6128Montreal Que. H3C 3J7 Canada

In sensory substitution, inform.tion acquired with one sensory m.dality is use d to accom.lish a task which is norm.lly subserved prim.rily by another sensory m.dality. We used PET to study cross-m.dal plasticity in the congenitally blind , using electrotactile stim.lation of the tongue. Blind (n=6) and sighted blindfolded controls (n=5) were scanned before and after they were trained to use their tongue in a Snellen orientation detect ion task. Results showed that both groups of subjects learned the discrim.nation orientation task after seven 1 h training sessions. Before training, no signifi cant changes in regional cerebral blood flow (rCBF) were observed in the occipit al cortex in either group. In sharp contrast, activity in the occipital cortex i ncreased after practice for the blind, but not for the sighted, providing eviden ce for training-induced plasticity in the blind. An inter-regional correlation analysis showed that task-related rCBF changes in left posterior parietal cort ex were positively correlated with rCBF changes in the occipital area of the tra ined blind. These data reveal that cross-m.dal plasticity in the blind develops rapidly and that the occipital cortex is part of a functional neural network fo r tactile discrim.nation in conjunction with the posterior parietal cortex. Our data further show that the tongue can act as a portal to convey som.tosensory in form.tion to visual cortex.

关键词：触觉刺激全盲交叉式可塑性变化 rCBF 局部脑血流量顶叶皮层检测任务视觉皮层枕区

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对先天性盲患者舌的电触觉刺激显示跨感官可塑性

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世界核心医学期刊文摘(眼科学分册) 2005年第8期 4-4页

作者： ptito m. m.esgaard S.m. Gjedde A. Kupers R. 陈立军 School of Optom.try Université de Montréal CP 6128 Montreal Que. H3C 3J7 Canada

In sensory substitution, inform.tion acquired with one sensory m.dality is use d to accom.lish a task which is norm.lly subserved prim.rily by another sensory m.dality. We used PET to study cross-m.dal plasticity in the congenitally blind , using electrotactile stim.lation of the tongue. Blind (n=6) and sighted blindf olded controls (n =5) were scanned before and after they were trained to use the ir tongue in a Snellen orientation detection task. Results showed that both grou ps of subjects learned the discrim.nation orientation task after seven 1 h train ing sessions. Before training, no significant changes in regional cerebral blood flow (rCBF) were observed in the occipital cortex in either group. In sharp con trast, activity in the occipital cortex increased after practice for the blind, but not for the sighted, providing evidence for training-induced plasticity in the blind. An inter-regional correlation analysis showed that task-related rCB F changes in left posterior parietal cortex were positively correlated with rCBF changes in the occipital area of the trained blind. These data reveal that cros s-m.dal plasticity in the blind develops rapidly and that the occipital cortex is part of a functional neural network for tactile discrim.nation in conjunction with the posterior parietal cortex. Our data further show that the tongue can a ct as a portal to convey som.tosensory inform.tion to visual cortex.

关键词：触觉刺激先天性盲顶叶皮层盲人

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