The role of the dynamic body schema in praxis: Evidence from primary progressive apraxia
The role of the dynamic body schema in praxis: Evidence from primary progressive apraxia
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DOI：
10.1006/brcg.2000.1227
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发表时间：
2000-11-01
影响因子：
2.5
通讯作者：
Libon, D
中科院分区：
文献类型：
--
作者：
Buxbaum, LJ;Giovannetti, T;Libon, D
在一个有影响力的肢体实践模型中，意念失用症是由于对储存的姿势表征的损害或表征的断开，从感觉输入或运动输出（Heilman和Gonzalez Rothi，1993：Gonzalez Rothi等，1991年）。我们报告的数据，从病人进行性的idedelephalic肢体失用症，不能很容易地容纳这种模式。患者BG在命令、看到物体和模仿的手势方面严重受损，但手势几乎正常，手中有工具，识别手势相对较好。此外，在模仿无意义的手势和需要身体位置信息的空间变换的任务上，表现严重受损。我们提供的证据表明，BG的失用症在很大程度上是由于外部存储的手势系统的程序编码的动态位置的身体部位的自我和他人的损伤：即，身体图式。我们提出了一个动态的，互动的praxis系统subserved后顶叶皮层中存储的代表性元素，当存在时，提供“自上而下”的支持，在线计算的空间程序。除了会计毛皮BG的表现，这个模型更容易容纳一个共同的模式比竞争的帐户的意念失用症。(C)北京大学出版社.
On an influential model of limb praxis, ideomotor apraxia results from damage to stored gesture representations or disconnection of representation?, from sensory input or motor output (Heilman & Gonzalez Rothi, 1993: Gonzalez Rothi ct al., 1991). We report data From a patient with progressive ideomotor limb apraxia which cannot be readily accommodated by this model. The patient, BG, is profoundly impaired in gesturing to command, to sight of object, and to imitation, but gestures nearly normally with tool in hand and recognizes gestures relatively well. In addition, performance is profoundly impaired on imitation of meaningless gestures and on tasks requiring spatiomotor transformations of body-position information. We provide evidence that BG's apraxia is largely attributable to impairments external to the stored gesture system in procedures coding the dynamic positions of the body parts of self and others: that is, the body schema. We propose a model of a dynamic, interactive praxis system subserved by posterior parietal cortex in which stored representational elements, when present, provide "top-down" support to spatiomotor procedures computed on-line. In addition to accounting fur BG's performance, this model accommodates a common pattern of ideomotor apraxia more readily than competing accounts. (C) 2000 Academic Press.