Background Deficits in motor movement in children with autism spectrum disorder (ASD) have typically been characterized qualitatively by human observers. Although clinicians have noted the importance of atypical head positioning (e.g. social peering and repetitive head banging) when diagnosing children with ASD, a quantitative understanding of head movement in ASD is lacking. Here, we conduct a...

We examined three-dimensional eye positions in alertness and light sleep when monkeys were placed in different roll and pitch body orientations. In alertness, eye positions were confined to a fronto-parallel (Listing's) plane, torsional variability was small and static roll or pitch induced a torsional shift or vertical rotation of these planes. In light sleep, the planes rotated temporally by ...

This paper expands on previous work to introduce a high quality, but low cost attitude and heading reference system (AHRS), that is physically small, lightweight, and lowpower. Previous Work on the sensor has shown that for non-accelerating environments, this small low-cost sensor has a short term accuracy of approximately 4 ◦ in pitch, roll, and yaw. We extend the previous two-step non-linear ...

The purpose of this study was to develop a technique to record physical references and orient digital mesh models to a natural head position using stereophotogrammetry (SP). The first step was to record the digital mesh model of a hanging reference board placed at the capturing position of the SP machine. The board was aligned to true vertical using a plumb bob. It also was aligned with a laser...

This thesis presents the system architecture for landing an Unmanned Aerial Vehicle (UAV) from a hovering position without the intervention of a human operator. Through the use of feedback information from a height sensor, the UAV is commanded to perform controlled descent with the desired landing parameters by implementation of the flight control laws. The plant model of the system was determi...

Knowledge of how the head moves during locomotion is essential for understanding how locomotion is controlled by sensory systems of the head. We have analyzed head movements of the cat walking along a straight flat pathway in the darkness and light. We found that cats' head left-right translations, and roll and yaw rotations oscillated once per stride, while fore-aft and vertical translations, ...