Maturation and experience in action representation: Bilateral deficits in unilateral congenital amelia.
Maturation and experience in action representation: Bilateral deficits in unilateral congenital amelia.
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DOI：
10.1016/j.neuropsychologia.2015.05.018
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发表时间：
2015-08
期刊：
影响因子：
2.6
通讯作者：
Frey SH
中科院分区：
文献类型：
--
作者：
Philip BA;Buckon C;Sienko S;Aiona M;Ross S;Frey SH
先天性单侧缺手（无肢）完全剥夺了个体的感觉运动经验与他们的缺失效应。这种剥夺对运动规划能力的影响尚不清楚。14名患者和匹配的对照组进行了两项握力选择任务：1)显性握力选择（OGS），在这项任务中，他们使用完好的手用最自然的（手下或手上）精确握力抓住不同方向出现的三维物体；2)前瞻性握力选择（PGS），在这项任务中，他们为完好或缺失的手选择最自然的握力。对于完整的手，我们通过比较PGS和OGS表达的握力偏好之间的一致性来评估规划准确性。对于缺失的手，我们比较了相移180°的完整手的PGS响应和OGS响应，从而考虑了两肢镜像对称的生物力学约束。和对照组一样，无糖个体在OGS和PGS中都表现出对不那么尴尬的握法的一致偏好。然而，出乎意料的是，无论是在完整的手还是缺失的手的情况下，他们都更慢，更不准确。我们的结论是，双手的直接感觉运动经验可能对任何肢体的特效特异性内部表征的典型发展或完善很重要。
Congenital unilateral absence of the hand (amelia) completely deprives individuals of sensorimotor experiences with their absent effector. The consequences of such deprivation on motor planning abilities are poorly understood. Fourteen patients and matched controls performed two grip selection tasks: 1) overt grip selection (OGS), in which they used their intact hand to grasp a three-dimensional object that appeared in different orientations using the most natural (under-or over-hand) precision grip, and 2) prospective grip selection (PGS), in which they selected the most natural grip for either the intact or absent hand without moving. For the intact hand, we evaluated planning accuracy by comparing concordance between grip preferences expressed in PGS vs. OGS. For the absent hand, we compared PGS responses with OGS responses for the intact hand that had been phase shifted by 180°, thereby accounting for mirror symmetrical biomechanical constraints of the two limbs. Like controls, amelic individuals displayed a consistent preference for less awkward grips in both OGS and PGS. Unexpectedly, however, they were slower and less accurate for PGS based on either the intact or the absent hand. We conclude that direct sensorimotor experience with both hands may be important for the typical development or refinement of effector-specific internal representations of either limb.