Vestibular Single Cell Recording in the Awake Monkey
Single cells isolated in the vestibular complex of the awake monkey were studied as a function of stimulus input. The stimulus utilized in this study was sinusoidal tilt in the anterior-posterior plane about a vertical axis. Once a single cell was isolated its response to tilt was determined. Changes in amplitude and period of the stimulus brought about corresponding changes in the unitary discharge pattern which could best be described as spike frequency modulation of stimulus input. Some cells displayed a greater rate of change than others. Techniques and procedures necessary to record from the awake monkey are described.
This article presents a video system to focus an object of interest in the field of view by means of a stereo robotic head. The system relies on a new hierarchical segmentation technique that split the stereo pair into regions in a combined way. After segmentation is achieved, resulting regions in both images are implicitly related by a set of links and, consequently, their disparity can be estimated. Then, the cameras vergence is changed according to the estimated dispar- ity until the object of interest is focused. The system has proven to be robust against mild noise and illumination changes. Its main advan- tage is that calibration is not a critical issue for the system to work.