BACKGROUND Relatively little is known about the degree of inter-specific variability in visual scanning strategies in species with laterally placed eyes (e.g., birds). This is relevant because many species detect prey while perching; therefore, head movement behavior may be an indicator of prey detection rate, a central parameter in foraging models. We studied head movement strategies in three ...

During face-to-face conversation, the head is constantly in motion, especially during speaking turns [2]. These movements are not random; research has identified a number of important functions served by head movements [7] [5] [3] [4]. Head movements provide a range of information in addition to the verbal channel such as nods to show our agreement or shakes to express disbelief. The goal of ou...

OBJECTIVE To describe a characteristic paroxysmal eye-head movement disorder that occurs in infants with Glut1 deficiency syndrome (Glut1 DS). METHODS We retrospectively reviewed the medical charts of 101 patients with Glut1 DS to obtain clinical data about episodic abnormal eye movements and analyzed video recordings of 18 eye movement episodes from 10 patients. RESULTS A documented histor...

Studies on the relationship between eyebrow movement and other aspects of speech production have focused on large, discrete movements of the eyebrows. Using integrated optical and electromagnetic point tracking, we measured eyebrow movements relative to the skull with a high level of precision. These data in combination with a correlational analysis method that accommodates varying phasing betw...

It was proposed that split-brain monkeys are able to perform ipsilateral eyehand response because the seeing hemisphere can cross-cue the blind hemisphere, which is in major motor control of the arm, by orienting toward a point in space and, thereby, allow for the bilateral registration of head, neck, and eye position. In the present study, accuracy of ipsilateral eye-hand response was measured...

The rodent whisker system has become the leading experimental paradigm for the study of active sensing. Thanks to more sophisticated behavioral paradigms, progressively better neurophysiological methods, and improved video hardware/software, there is now the prospect of defining the precise connection between the sensory apparatus and brain activity in awake, exploring animals. Achieving this a...

Head movements are linked not only to symbolic gestures, such as head-nodding to represent “yes” or head-shaking to represent “no,” but also to the production of suprasegmental features of speech, such as stress, prominence, and other aspects of prosody. Recent studies have shown that head movements play a more direct role in the perception of speech. In this paper, we propose a novel method fo...

During locomotion, there is a translation and compensatory rotation of the head in both the vertical and horizontal planes. During moderate to fast walking (100 m/min), vertical head translation occurs at the frequency of stepping (2 Hz) and generates peak linear acceleration of 0.37 g. Lateral head translation occurs at the stride frequency (1 Hz) and generates peak linear acceleration of 0.1 ...

Eye movements are realized in hardware with controlling an optic axis according to the movement types of an object and a head using artificial neural network. Saccadic and smooth pursuit eye movements are realized as an autokinesis, and compensatory eye movement as a reflex by a hardware mechanism. In order to have basic optic axis movements, by which an object is caught in a central pit of ret...