Partitioning the components of visuomotor adaptation to prism-altered distance
Partitioning the components of visuomotor adaptation to prism-altered distance
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DOI：
10.1016/j.neuropsychologia.2010.11.028
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发表时间：
2011-02-01
期刊：
影响因子：
2.6
通讯作者：
Roumes, Corinne
中科院分区：
文献类型：
--
作者：
Priot, Anne-Emmanuelle;Laboissiere, Rafael;Roumes, Corinne
虽然短期适应棱镜改变表观视觉方向的机制已被广泛研究，但对棱镜改变感知距离的适应过程尚不清楚。本研究采用手指向范式和底向棱镜暴露来评估感觉（视觉和本体感觉）和运动成分对感知距离改变的适应的相对贡献。一个主要实验是通过给受试者改变的视觉反馈来诱导感觉和运动水平的适应。一个没有视觉反馈的控制实验允许通过棱镜持续注视引起的眼肌增强（EMP）效应被揭示。在主实验中，后效被划分为三分之二的视觉和三分之一的运动，没有明显的本体感觉成分，这与经典的短期适应模式不同，后者主要包括本体感觉/运动适应成分，视觉成分较少。这种差异可归因于本体感觉和视觉在深度或横向定位方面的准确性差异。此外，对主实验和对照实验的视觉后效进行了比较，发现有两个子分量的贡献相同：收敛信号与感知距离之间映射的重新校准，以及与empp相关的后效。这些发现表明，“视觉”适应实际上涉及多种过程。(C) 2010 Elsevier Ltd.版权所有。
While the mechanisms of short-term adaptation to prism-altered apparent visual direction have been widely investigated, the processes underlying adaptation to prism-altered perceived distance are less well known. This study used a hand-pointing paradigm and exposure with base-out prisms to evaluate the relative contributions of sensory (visual and proprioceptive) and motor components of adaptation to perceived-distance alteration. A main experiment was designed to elicit adaptation at the sensory and motor levels, by giving subjects altered visual feedback A control experiment without visual feedback allowed the effects of eye muscle potentiation (EMP) induced by sustained fixation through the prisms to be uncovered. In the main experiment, the aftereffects were partitioned into two-thirds visual and one-third motor, with no significant proprioceptive component These results differ from the classical pattern of short-term adaptation to prism-altered apparent visual direction, which includes mainly proprioceptive/motor adaptive components, with a smaller visual component. This difference can be attributed to differences in accuracy between proprioception and vision for localization in depth or in lateral directions. In addition, a comparison of the visual aftereffects in the main and control experiments revealed two sub-components with equal contributions: a recalibration of the mapping between the vergence signal and perceived distance, and an EMP-related aftereffect. These findings indicate that "visual" adaptation actually involves a multiplicity of processes. (C) 2010 Elsevier Ltd. All rights reserved.