Please cite this article in press as: K.L. Yeung, L. ments, Displays (2012), http://dx.doi.org/10.101 We have previously shown that concurrent head movements impair head-referenced image motion perception when compensatory eye movements are suppressed (Li, Adelstein, & Ellis, 2009) [16]. In this paper, we examined the effect of the field of view on perceiving world-referenced image motion durin...

Relatively little is known about movements of the eyes, head, and hands in natural tasks. Normal behavior requires spatial and temporal coordination of the movements in more complex circumstances than are typically studied, and usually provides the opportunity for motor planning. Previous studies of natural tasks have indicated that the parameters of eye and head movements are set by global tas...

Speech communication involves normally not only speech but also face and head movements. In the present investigation the visual correlates to focal accent and to confirmation in Swedish are studied and a computational model for the movements is hypothesized. The head movements are recorded with the Qualisys MacReflex motion tracking system simultaneously with the speech signal. The results con...

background: the cervical spine is the most vulnerable part of the vertebral column and the rotational movements are the most dangerous movements which may cause damages to cervical spine. a good treatment option for the cervical disc disease is the replacement of a damaged disc with an artificial disc that has shown satisfactory clinical results. methods: the c4 to c6 vertebrae of a normal subj...

[Purpose] To investigate the changes of body balance in static posture in smooth-pursuit eye movements (SPEMs) without head movement. [Subjects and Methods] Forty subjects (24 males, 16 females) aged 23.24 ± 2.58 years participated. SPEMs were activated in three directions (horizontal, vertical, and diagonal movements); the target speed was set at three conditions (10°/s, 20°/s, and 30°/s); and...

Redirecting gaze towards new targets often requires not only eye movements, but also synergistic rotations of the head, trunk and feet. This study investigates the influence of postural constraints on eye and head latency during voluntary refixations in the horizontal plane in 14 normal subjects. Three postural conditions were presented, (1) sitting in a chair using only eye and head movements,...

When the head is free to move, changes in the direction of the line of sight (gaze shifts) can be accomplished using coordinated movements of the eyes and head. During repeated gaze shifts between the same two targets, the amplitudes of the saccadic eye movements and movements of the head vary inversely as a function of the starting positions of the eyes in the orbits. In addition, as head-move...

Previous studies have shown that accurate saccades can be generated, in the dark, that compensate for movements of the visual axis that result from movements of either the eyes alone or the head alone that intervene between target presentation and saccade onset. We have carried out experiments with human subjects to test whether gaze saccades (gaze = eye-in-space = eye-in-head + head-in-space) ...

Recent research highlights sensorimotor control disturbances in those with neck disorders. Assessment and management of the symptoms of dizziness, altered cervical proprioception, eye and head co-ordination and disturbances to postural stability in those with neck disorders are important and are presented in a companion article. In this paper, four case studies are presented to illustrate the f...

Irregular vestibular afferents exhibit significant phase leads with respect to angular velocity of the head in space. This characteristic and their connectivity with vestibulospinal neurons suggest a functionally important role for these afferents in producing the vestibulo-collic reflex (VCR). A goal of these experiments was to test this hypothesis with the use of weak galvanic stimulation of ...