1. Eye- and head movements were recorded in unrestrained, spontaneously behaving rabbits with a new technique, based upon phase detection of signals induced in implanted coils by a rotating magnetic field. 2. Movements of the eye in space were exclusively saccadic. In the intersaccadic intervals the eyes were stabilized in space, even during vigorous head movements. Most of this stability was m...

Various optimality principles have been proposed to explain the characteristics of coordinated eye and head movements during visual orienting behavior. At the same time, researchers have suggested several neural models to underly the generation of saccades, but these do not include online learning as a mechanism of optimization. Here, we suggest an open-loop neural controller with a local adapt...

An investigation is conducted regarding embodiment (in the context of the paper embodiment is an intelligent agent present in real world) and it’s effect on tutoring behaviour as opposed to nonembodied agents. Experiment consisted of cup stacking task that had to be taught to a learner present in either of four conditions: 1) simulation w/o head movements (only eyes); 2) simulation w/head movem...

Head movements are primarily sensed in a reference frame tied to the head, yet they are used to calculate self-orientation relative to the world. This requires to re-encode head kinematic signals into a reference frame anchored to earth-centered landmarks such as gravity, through computations whose neuronal substrate remains to be determined. Here, we studied the encoding of self-generated head...

Different head movements can help us not only understand accurately whether the speaker in question is in favor of or against the current topic but also recognize human expressions better, i.e. distinguishing similar expressions such as smile and scorn. Since the movements of the feature point -nostrils on the face and the movements of the head are almost the same, tracing the feature point wit...

To model the sources of measured magnetic fields, the relationship of the magnetic sensors to the head must be known [2]. This is usually accomplished by feeding currents through coils attached to the surface of the head [4]. The locations of the coils with respect to the sensor array are then computed on the basis of the measured signals. When evoked responses are studied, several responses us...

BACKGROUND Neck muscle weakness and head drop are well recognised in patients with Amyotrophic lateral sclerosis (ALS), but an objective characterisation of the consequent head movement impairment is lacking. The aim of this study was to quantitatively characterise head movements in ALS compared to aged matched controls. METHODS We evaluated two groups, one of thirteen patients with ALS and o...

When the head is free to move, microstimulation of the primate superior colliculus (SC) evokes coordinated movements of the eyes and head. The similarity between these stimulation-induced movements and visually guided movements indicates that the SC of the primate is involved in redirecting the line of sight (gaze). To determine how movement commands are represented by individual collicular neu...

Humans explore static visual scenes by alternating rapid eye movements (saccades) with periods of slow and incessant eye drifts [1-3]. These drifts are commonly believed to be the consequence of physiological limits in maintaining steady gaze, resulting in Brownian-like trajectories [4-7], which are almost independent in the two eyes [8-10]. However, because of the technical difficulty of recor...

The vestibular nerve sends signals to the brain that code the movement and position of the head in space. These signals are used by the brain for a variety of functions, including the control of reflex and voluntary movements and the construction of a sense of self-motion. If many of these functions are to be carried out, a distinction must be made between sensory vestibular signals related to ...