McCollum G, Shupert C L, Nashner L M
R.S. Dow Neurological Sciences Institute of Good Samaritan Hospital and Medical Center, Portland, OR 97209, USA.
J Theor Biol. 1996 Jun 7;180(3):257-70. doi: 10.1006/jtbi.1996.0101.
Healthy human subjects can maintain adequate balance despite distorted somatosensory or visual feedback or vestibular feedback distorted by a peripheral vestibular disorder. Although it is not precisely known how this sensorimotor integration task is achieved, the nervous system coordinates information from multiple sensory systems to produce motor commands differently in different sensory environments. These different ways of coordinating sensory information and motor commands can be thought of as "sensorimotor states". The way the nervous system distributes the monitoring of postural sway among states is analysed in this paper as a logical structure of transitions between states. The form of the transition structure is specified and distinguished from a finite state machine. The hypothesis that the nervous system could use a transition structure to maintain balance is tested by developing transition structures which are consistent with a set of experimental observations of postural control in healthy subjects and three groups of patients with peripheral vestibular disease.
健康的人类受试者能够保持足够的平衡，尽管体感或视觉反馈出现扭曲，或者前庭反馈因外周前庭疾病而扭曲。虽然目前尚不清楚这种感觉运动整合任务是如何完成的，但神经系统会协调来自多个感觉系统的信息，以便在不同的感觉环境中以不同方式产生运动指令。这些协调感觉信息和运动指令的不同方式可被视为“感觉运动状态”。本文将神经系统在这些状态之间分配对姿势摆动监测的方式分析为状态之间转换的逻辑结构。确定了转换结构的形式，并将其与有限状态机区分开来。通过开发与健康受试者和三组外周前庭疾病患者姿势控制的一组实验观察结果相一致的转换结构，对神经系统可利用转换结构来维持平衡这一假设进行了检验。
