Long-lasting aftereffect of a single prism adaptation: shifts in vision and proprioception are independent
Long-lasting aftereffect of a single prism adaptation: shifts in vision and proprioception are independent
复制标题
DOI：
10.1007/s00221-006-0381-2
复制
发表时间：
2006-08-01
影响因子：
2
通讯作者：
Miall, R. Chris
中科院分区：
文献类型：
--
作者：
Hatada, Yohko;Rossetti, Yves;Miall, R. Chris
在对位移幅度逐渐增加的棱镜进行单次适应后，在无视觉反馈的情况下，采用开环中矢状指向视觉目标测量棱镜适应后效应。这种后效应对应于本体感觉位移的总和，通过没有视觉的直前方指向(S)来测量，以及视觉直前方判断(V)，通过从两个相反方向移动的LED的口头停止来测量。然而，在7天内进行的后遗症测量显示，V、O和S的衰减曲线明显不同。令人惊讶的是，S的变化在训练结束后7天仍然存在，而V在训练结束后2小时就恢复到原来的水平，这是被试返回正常视觉环境后的第一次测量。0例在1天后恢复到试验前水平。3天后，Wilkinson的（J Exp Psychol 89:250- 257,1971）加性假设（O=S-V）不再符合数据。相反，在我们的研究中，“O=Pl- v”，其中Pl （Pr）是通过被动侧臂运动从左（右）测量的本体感觉的移动，在整个7天的后遗症中更适合。因此，我们的强棱镜适应的后效应表明，首先，经典开环指向是由后效位移等于视觉(V)和本体感觉（Pl）这两个被动可测量的后效分量的位移之和组成的，而不是主动的直线指向(S)。第二，视觉知觉和被动可测本体感觉的移位衰减是独立的。前者衰减快，后者衰减慢，有两个独立的波。第三，我们认为视觉感知依赖的空间编码与视觉独立的内部自我中心参照系是相互排斥的。我们提出了一个模型来解释这些可能的机制。
After a single adaptation session to prisms with gradually incremented shift magnitude, the prism adaptation aftereffect was measured by open loop mid-sagittal pointing (O) to a visual target without visual feedback. This aftereffect corresponded to the summation of the shift in proprioception, measured by straight ahead pointing without vision (S), and the visual straight ahead judgement (V), measured by verbal stopping of an LED moving from two opposite directions. However, the measurement of the aftereffects made over a period of 7 days revealed significantly different decay curves in V, O and S. Surprisingly the S shift was still present up to 7 days after the training, while V had returned to the original level by 2 h, which was the first measurement after subjects returned to a normal visual environment. O had returned to pre-test level after 1 day. After 3 days Wilkinson's (J Exp Psychol 89:250-257, 1971) additive hypothesis (O=S-V) no longer fit the data. Rather "O=Pl-V", where Pl (Pr) is the shift in proprioception measured by passive lateral arm movements from left (right), fitted better during the whole 7 days of aftereffect in our study. Therefore, the aftereffect of our strong prism adaptation revealed, firstly, that classical open loop pointing consisted of aftereffect shifts equal to the summation of the shifts in the two passively measurable aftereffect components, vision (V) and proprioception (Pl), rather than with active straight ahead pointing (S). Secondly, the decay of the shift in visual perception and in passively measurable proprioception is independent. The former decays fast, and the latter decays slowly with two separate waves. Thirdly, we suggest that the use of visual perception-dependent spatial codes for visual-manual transformation and the vision-independent internal egocentric reference frame are mutually exclusive. We proposed a model to explain these possible mechanisms.