Human Motor Systems Laboratory, University of São Paulo São Paulo, Brazil ; Movement Analysis and Research Laboratory, Federal University of São Carlos São Carlos, Brazil.
Front Psychol. 2013 Aug 9;4:520. doi: 10.3389/fpsyg.2013.00520. eCollection 2013.
Capacity of using visual feedback by infants at the age of reaching onset has been controversial. In this investigation we assessed movement kinematics in the task of reaching for a toy in 5-month-olds, comparing movements performed with the preferred arm under full vision versus visual occlusion. That comparison was made in consecutive periods of visual occlusion. Analysis of results revealed that visual occlusion led to decreased straightness of arm displacement toward the toy as compared to full vision. Longer periods of occlusion did not augment that effect. These results offer preliminary evidence for use of visual feedback early in infants' reaching development. Reconciliation of previous and current findings is made by proposing a hybrid mode of feedback processing for manual control reweighting the roles of vision and proprioception as a function of availability of environmental information.
婴儿在开始伸手拿东西的年龄使用视觉反馈的能力一直存在争议。在这项研究中，我们评估了 5 个月大的婴儿伸手拿玩具任务中的运动运动学，比较了在完全视觉和视觉遮挡下使用惯用手臂进行的运动。在连续的视觉遮挡期进行了这种比较。结果分析表明，与完全视觉相比，视觉遮挡会导致手臂向玩具的位移直线度降低。较长时间的遮挡并不能增强这种效果。这些结果为婴儿伸手发育早期使用视觉反馈提供了初步证据。通过提出一种混合模式的反馈处理来调和先前和当前的发现，该模式重新调整了视觉和本体感觉在手动控制中的作用，作为环境信息可用性的函数。
