Spatial orientation of the vestibular system: dependence of optokinetic after-nystagmus on gravity

摘要: 1. Monkeys received optokinetic stimulation at 60 degrees/s about their yaw (animal vertical) and pitch horizontal) axes, as well other head-centered axes in the coronal plane. The animals were upright or tilted right-side-down positions with regard to gravity. stimuli induced horizontal, vertical, oblique nystagmus (OKN). OKN was followed by after-nystagmus (OKAN), which recorded darkness. 2. When monkeys tilted, that generated horizontal axis eye velocity during a vertical component of slow phase OKAN. This has been designated "cross-coupling" Eigenvalues eigenvectors associated system generating OKAN found function tilt. They determined use Levenberg-Marquardt algorithm minimize mean square error between output model data. 3. eigenvector (yaw eigenvector) maintained close spatial regardless angle (pitch always aligned body axis. data indicate storage can be modeled piecewise linear system, structure is dependent on gravity eigenvector, tends align 4. Yaw also giving plane animal various angles A technique using spectral analysis residuals developed estimate whether velocities decayed concurrently same relative rate over time course. this method agreement those obtained analyzing elicited OKN. 5. During positions, vector ensuing closer than vertical. suggests there suppression cross-coupled direction stimulus may utilized suppress components not coincident motion. 6. There similarities monkey human perception for upward downward overlay 1-g perceptual data.(ABSTRACT TRUNCATED AT 400 WORDS)