Video stimuli reduce object-directed imitation accuracy: a novel two-person motion-tracking approach.
Video stimuli reduce object-directed imitation accuracy: a novel two-person motion-tracking approach.
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DOI：
10.3389/fpsyg.2015.00644
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发表时间：
2015
影响因子：
3.8
通讯作者：
Holmes NP
中科院分区：
文献类型：
--
作者：
Reader AT;Holmes NP
模仿是一种重要的社会行为形式，研究的目的是发现和解释模仿的神经和运动学方面。然而，这项研究的大部分内容都是单个参与者对预先录制的视频刺激做出反应的模仿。尽管有研究结果表明，与现实生活中的运动刺激相比，视频刺激下的神经活动减少了，特别是在运动皮质。我们使用一种新的具有高空间和时间分辨率的运动跟踪范式来研究视频刺激对模仿过程的影响程度。在一个模仿实验中，我们记录了两个人的手、胳膊和头上的14个姿势。一个人在给定的参数内自由移动(在一系列钉子上移动球)，另一个参与者模仿。这项任务是以简单的(一个球)或复杂的(三个球)移动难度进行的，或者是面对面的，或者是通过现场视频投影的。经过探索性分析后，选择了三个因变量进行检查：3D握力位置、手臂关节角度和握力孔径。交叉相关和多变量分析表明，与面对面反馈相比，视频中客体定向模仿任务的准确性(以握手位置为代表)有所降低，与简单难度相比，复杂情况下的模仿任务的准确性更低。这在左右和前后动作中最为普遍，与模仿者面对面坐着或与同一演员的现场放映视频有关。结果表明，对于需要客体定向模仿的任务，视频刺激可能不是一种生态上有效的呈现任务材料的方式。然而，在关节角度和握力孔径变量中没有发现类似的影响，这表明视频刺激对模仿的影响是有限的。文中还讨论了这些结果对先前发现的影响，并对未来的实验提出了建议。
Imitation is an important form of social behavior, and research has aimed to discover and explain the neural and kinematic aspects of imitation. However, much of this research has featured single participants imitating in response to pre-recorded video stimuli. This is in spite of findings that show reduced neural activation to video vs. real life movement stimuli, particularly in the motor cortex. We investigated the degree to which video stimuli may affect the imitation process using a novel motion tracking paradigm with high spatial and temporal resolution. We recorded 14 positions on the hands, arms, and heads of two individuals in an imitation experiment. One individual freely moved within given parameters (moving balls across a series of pegs) and a second participant imitated. This task was performed with either simple (one ball) or complex (three balls) movement difficulty, and either face-to-face or via a live video projection. After an exploratory analysis, three dependent variables were chosen for examination: 3D grip position, joint angles in the arm, and grip aperture. A cross-correlation and multivariate analysis revealed that object-directed imitation task accuracy (as represented by grip position) was reduced in video compared to face-to-face feedback, and in complex compared to simple difficulty. This was most prevalent in the left-right and forward-back motions, relevant to the imitator sitting face-to-face with the actor or with a live projected video of the same actor. The results suggest that for tasks which require object-directed imitation, video stimuli may not be an ecologically valid way to present task materials. However, no similar effects were found in the joint angle and grip aperture variables, suggesting that there are limits to the influence of video stimuli on imitation. The implications of these results are discussed with regards to previous findings, and with suggestions for future experimentation.
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影响因子：
2.9
作者：
Liu T;Pelowski M
通讯作者：
Pelowski M
影响因子：
56.9
作者：
Iacoboni, M;Woods, RP;Rizzolatti, G
通讯作者：
Rizzolatti, G
DOI：
10.1098/rstb.2002.1257
发表时间：
2003-03-29
影响因子：
6.3
作者：
Wohlschläger, A;Gattis, M;Bekkering, H
通讯作者：
Bekkering, H
DOI：
10.1073/pnas.1001791107
发表时间：
2010-05-18
影响因子：
11.1
作者：
Schippers, Marleen B.;Roebroeck, Alard;Keysers, Christian
通讯作者：
Keysers, Christian
影响因子：
1.7
作者：
Hardwick, Robert M.;Edwards, Martin G.
通讯作者：
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