Impaired visual size-discrimination in children with movement disorders
Impaired visual size-discrimination in children with movement disorders
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DOI：
10.1016/j.neuropsychologia.2012.04.009
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发表时间：
2012-07-01
期刊：
影响因子：
2.6
通讯作者：
Burr, David
中科院分区：
文献类型：
--
作者：
Cori, Monica;Tinelli, Francesca;Burr, David
空间信息的多感官整合发生在儿童时期的晚期，大约8岁（Gori，Del Viva，Sandini和Burr，2008）。对于年龄较小的儿童，触觉系统占主导地位的大小歧视和视觉占主导地位的方向歧视：优势可能反映感官校准，并可能有直接的后果，对儿童出生的特定感官残疾。在这里，我们测量阈值的视觉辨别的方向和大小的上肢运动障碍的儿童。在所有8名早发性运动障碍患者中，视觉方向辨别与年龄匹配的典型儿童非常相似，但视觉大小辨别阈值要差得多。这个令人惊讶的和违反直觉的结果很容易解释的跨感官校准假设：当触觉是不可用的操作，它不能很容易地被用来估计大小，因此校准的大小视觉体验：视觉辨别力随后受损。这补充了先前的研究，该研究表明，失明儿童的触觉方向敏锐度降低，但触觉大小，辨别力没有降低（科里，Sandini，Martinoli，& Burr，2010）。这些研究表明，当视觉或触觉操作受损时，这种损害也会影响由该系统校准的互补感觉系统。(C)2012爱思唯尔有限公司保留所有权利。
Multisensory integration of spatial information occurs late in childhood, at around eight years (Gori, Del Viva, Sandini, & Burr, 2008). For younger children, the haptic system dominates size discrimination and vision dominates orientation discrimination: the dominance may reflect sensory calibration, and could have direct consequences on children born with specific sensory disabilities. Here we measure thresholds for visual discrimination of orientation and size in children with movement disorders of upper limbs. Visual orientation discrimination was very similar to the age-matched typical children, but visual size discrimination thresholds were far worse, in all eight individuals with early-onset movement disorder. This surprising and counterintuitive result is readily explained by the cross-sensory calibration hypothesis: when the haptic sense is unavailable for manipulation, it cannot be readily used to estimate size, and hence to calibrate the visual experience of size: visual discrimination is subsequently impaired. This complements a previous study showing that non-sighted children have reduced acuity for haptic orientation, but not haptic size, discriminations (Cori, Sandini, Martinoli, & Burr, 2010). Together these studies show that when either vision or haptic manipulation is impaired, the impairment also impacts on complementary sensory systems that are calibrated by that one. (C) 2012 Elsevier Ltd. All rights reserved.