Stefan Glasauer

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The control of head direction in humans walking along planned circular trajectories was investigated in this study. Five healthy volunteers were asked to walk at a constant speed along circular trajectories in the light and while blindfolded. Head and walking directions were analysed on a real-time basis. Head direction systematically anticipated changes in(More)
We consider approximations of a smooth convex body by inscribed and circumscribed convex polytopes as the number of vertices, resp. facets tends to innnity. The measure of deviation used is the diierence of the mean width of the convex body and the approximating polytopes. The following results are obtained. (i) An asymptotic formula for best approximation.(More)
In the present study, we compared the effects of two processing modes on the updating of the location and orientation of a previously viewed object in space during a guided walk without vision. In Experiment 1, in order to measure the error for initial perception of object's orientation, 12 subjects rotated a miniature model until it matched the memorized(More)
Periodical stimulation of the otoliths during linear horizontal displacement leads not only to motion and displacement perception but also to the "Hilltop Illusion", which is the perception of being transported not on an earth-horizontal path, but over a small hill. This phenomenon is explained by the partial reinterpretation of the linear acceleration to a(More)
When a subject is walking blindfolded straight ahead towards a previously seen target, the brain must update an internal representation with respect to the environment. This study examines whether the information given by the vestibular system is necessary for this simple path integration task and gives a quantitative description of locomotor behaviour(More)
Patients with episodic ataxia type 2 (EA2) can often be successfully treated with acetazolamide. The authors report three patients with EA2 (two with proven mutations in the CACNA1A gene) whose attacks were prevented with the potassium channel blocker 4-aminopyridine (4-AP; 5 mg tid). Attacks recurred after treatment was stopped; subsequent treatment(More)
Grip force adjustments to fluctuations of inertial loads induced by vertical arm movements with a grasped object were analysed during normal and impaired finger sensibility. Normally grip force is modulated in a highly economical way in parallel with fluctuations of load force. Two subjects performed vertical up and down movements of a grasped object, both(More)
1. Passive linear self-motion estimation along the X and Y axes was investigated in human subjects. 2. A target was viewed from a distance of 0.8 or 2.4 m from the starting point. Subjects were then blindfolded and transported toward the target on a distance of 3.2 m and back to the start. Acceleration was constant: +/- 0.2 or +/- 1 m/s2. The subjects(More)
Complex motion stimuli provide a unique and powerful method to stretch the limited range of sensory stimulation we normally experience and to decouple those sensory inputs which normally correlate with one another during normal movements. By examining the responses induced by complex stimuli, the characteristics of the underlying neural processing (from(More)
The possible role of the cerebellum for the control of saccades and gaze holding is reconsidered using a computational modeling approach. As suggested by previous research, control of gaze holding is assumed to be enhanced by the floccular lobe, whereas control of the saccadic pulse is governed by the oculomotor vermis and fastigial nucleus. In the present(More)