Primates explore a visual scene through a succession of saccades. Much of what is known about the neural circuitry that generates these movements has come from neurophysiological studies using subjects with their heads restrained. Horizontal saccades and the horizontal components of oblique saccades are associated with high-frequency bursts of spikes in medium-lead burst neurons (MLBs) and long...

This study examined Auditory (A) and Visual (V) speech (speech-related head and face movement) as a function of noise environment. Measures of AV speech were recorded for 3 males and 1 female for 10 sentences spoken in quiet as well as four styles of background noise (Lombard speech). Auditory speech was analyzed in terms of overall intensity, duration, spectral tilt and prosodic parameters emp...

Experiments were conducted to determine how the ability to detect and discriminate head-motion parallax depth cues is degraded by time delays between head movement and image update. The stimuli consisted of random-dot patterns that were programmed to appear as one cycle of a sinusoidal grating when the subject’s head moved. The results show that time delay between head movement and image update...

The objective of this paper is to bring to you a technology that helps those handicapped who don’t have healthy hands to run a vehicle by giving the voice commands. In this the driver need not use the steering instead his head. This vehicle is only for those handicapped those who can nod head well. Four switches are interfaced over the neck of the driver, and the vehicle can be controlled by th...

Virtual reality displays introduce spatial distortions that are very hard to correct because of the difficulty of precisely modelling the camera from the nodal point of each eye. How significant are these distortions for spatial perception in virtual reality? In this study we used a helmet mounted display and a mechanical head tracker to investigate the tolerance to errors between head motions ...

PURPOSE The purpose of this study was to investigate the influence of head motion on the accuracy of three-dimensional (3D) reconstruction with cone-beam computed tomography (CBCT) scan. MATERIALS AND METHODS Fifteen dry skulls were incorporated into a motion controller which simulated four types of head motion during CBCT scan: 2 horizontal rotations (to the right/to the left) and 2 vertical...

The spiking activity of hippocampal neurons during rapid eye movement (REM) sleep exhibits temporally structured replay of spiking occurring during previously experienced trajectories. Here, temporally structured replay of place cell activity during REM sleep is modeled in a large-scale network simulation of grid cells, place cells and head direction cells. During simulated waking behavior, the...

Head-movement is something of a conundrum in modern syntactic theory. At the beginning of the 1990s, it fit beautifully into the system of assumptions that were gradually coalescing into the Minimalist Program. The Head Movement Constraint of Travis 1984 was unified with other constraints on movement as an instance of Rizzi’s 1990:11 Relativized Minimality, the first overarching vision of how e...

BACKGROUND Neck pain is associated with several alterations in neck motion and motor control. Previous studies have investigated single constructs of neck motor control, while few have applied a comprehensive set of tests to investigate cervical motor control. This comparative cross- sectional study aimed to investigate different motor control constructs in neck pain patients and healthy contro...

Techniques are discussed for using ultrasound for lingual imaging in field-related applications. The greatest challenges we have faced distinguishing the field setting from the laboratory setting are the lack of controlled head/transducer movement, and the related issue of tissue compression. Two experiments are reported. First, a pilot study identifies important factors in controlling head/tra...