We describe four families with late onset episodic vertical oscillopsia and progressive gait ataxia. Probands presented between the ages of 40 and 64 with initial symptoms of episodic vertical oscillopsia and interictal downbeat nystagmus. A mild gait ataxia developed over several years. Triggers included physical exertion, alcohol and caffeine. Patients did not respond to acetazolamide. Geneti...

Albert and Miller (1997) performed an analysis of vertical velocity and angular momentum for single and double Axels. Their results indicate that both radial and tangential motion of the skater are critical to the generation of vertical velocity throughout the take-off of single and double Axels. In generating angular momentum during the take-off, the movement of the free leg was most critical....

We have identified factors that control precise motor timing by studying learning in smooth pursuit eye movements. Monkeys tracked a target that moved horizontally for a fixed time interval before changing direction through the addition of a vertical component of motion. After repeated presentations of the same target trajectory, infrequent probe trials of purely horizontal target motion evoked...

BACKGROUND A Sit to Stand task following a hip fracture may be achieved through compensations (e.g. bilateral arms and uninvolved lower extremity), not restoration of movement strategies of the involved lower extremity. The primary purpose was to compare upper and lower extremity movement strategies using the vertical ground reaction force during a Sit to Stand task in participants recovering f...

Vertical movement patterns of chum salmon (Oncorhynchus keta) during their homing migration were examined using archival tags. Vertical movements through the thermocline with a periodicity of less than 1 h were observed during the day in the North Pacific. To examine the dynamics of these short-term vertical movements, we developed a simple one-dimensional vertical movement model. It is assumed...

We used a geolocation method based on tidal amplitude and water depth to assess the horizontal movements of 14 cod Gadus morhua equipped with time-depth recorders (TDR) in the North Sea and English Channel. Tracks ranged from 40 to 468 d and showed horizontal movements of up to 455 km and periods of continuous localised residence of up to 360 d. Cod spent time both in midwater (43% of total tim...

Key words: accessory optic system-pretectum-retinal slip-optokinetic nystagmus In optokinetic nystagmus (OKN) retinal slip, that is, movement of the visual world on the retina, results in stabilizing eye movements which reduce the retinal slip velocity almost to zero. The visual input for this compensatory reflex seems to be transmitted along anatomically distinct pathways to the pretectal nucl...

In this study we investigate the spatial variation in vertical land motion (VLM) along the coast of Singapore over the past two decades and we examine the impact of spatially variable VLM on relative sea level trends. For that, we use an integrated approach based on the merging of terrain displacement velocities estimated by time series of interferometric synthetic aperture radar (InSAR) data a...