An implicit body representation underlying human position sense
An implicit body representation underlying human position sense
复制标题
DOI：
10.1073/pnas.1003483107
复制
发表时间：
2010-06-29
影响因子：
11.1
通讯作者：
Haggard, Patrick
中科院分区：
文献类型：
--
作者：
Longo, Matthew R.;Haggard, Patrick
了解身体在外部空间中的位置是一项基本的感知任务。通过本体感觉感知身体部位的位置需要将每个关节的角度信息（即身体姿势）与关节之间的身体部分的大小和形状信息相结合。虽然关于身体姿势的信息是由在线传入信号指定的，但没有任何感觉信号可以直接提供关于身体大小和形状的信息。因此，人体位置感必须参考存储的身体度量属性的身体模型，例如身体部位的大小和形状。人们早就认识到需要这样一种模式；然而，这个模型的性质从未被系统地研究过。我们开发了一种技术来分离和测量这个身体模型。参与者判断手上10个地标在外部空间中的位置。通过分析这些点位置的内部结构，我们产生了手的大小和形状的心理表征的隐式地图。我们展示了身体模型的这一部分是严重扭曲的，以一种可靠的、有特色的方式，表现为手指变短，手掌变宽。有趣的是，这些扭曲似乎保留了初级体感表征的几个特征，比如彭菲尔德小矮人。
Knowing the body's location in external space is a fundamental perceptual task. Perceiving the location of body parts through proprioception requires that information about the angles of each joint (i.e., body posture) be combined with information about the size and shape of the body segments between joints. Although information about body posture is specified by on-line afferent signals, no sensory signals are directly informative about body size and shape. Thus, human position sense must refer to a stored body model of the body's metric properties, such as body part size and shape. The need for such a model has long been recognized; however, the properties of this model have never been systematically investigated. We developed a technique to isolate and measure this body model. Participants judged the location in external space of 10 landmarks on the hand. By analyzing the internal configuration of the locations of these points, we produced implicit maps of the mental representation of hand size and shape. We show that this part of the body model is massively distorted, in a reliable and characteristic fashion, featuring shortened fingers and broadened hands. Intriguingly, these distortions appear to retain several characteristics of primary somatosensory representations, such as the Penfield homunculus.